1. 12 Feb, 2015 40 commits
    • Andrea Arcangeli's avatar
      mm: gup: add __get_user_pages_unlocked to customize gup_flags · 0fd71a56
      Andrea Arcangeli authored
      
      
      Some callers (like KVM) may want to set the gup_flags like FOLL_HWPOSION
      to get a proper -EHWPOSION retval instead of -EFAULT to take a more
      appropriate action if get_user_pages runs into a memory failure.
      Signed-off-by: default avatarAndrea Arcangeli <aarcange@redhat.com>
      Reviewed-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Cc: Andres Lagar-Cavilla <andreslc@google.com>
      Cc: Peter Feiner <pfeiner@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      0fd71a56
    • Andrea Arcangeli's avatar
      mm: gup: add get_user_pages_locked and get_user_pages_unlocked · f0818f47
      Andrea Arcangeli authored
      FAULT_FOLL_ALLOW_RETRY allows the page fault to drop the mmap_sem for
      reading to reduce the mmap_sem contention (for writing), like while
      waiting for I/O completion.  The problem is that right now practically no
      get_user_pages call uses FAULT_FOLL_ALLOW_RETRY, so we're not leveraging
      that nifty feature.
      
      Andres fixed it for the KVM page fault.  However get_user_pages_fast
      remains uncovered, and 99% of other get_user_pages aren't using it either
      (the only exception being FOLL_NOWAIT in KVM which is really nonblocking
      and in fact it doesn't even release the mmap_sem).
      
      So this patchsets extends the optimization Andres did in the KVM page
      fault to the whole kernel.  It makes most important places (including
      gup_fast) to use FAULT_FOLL_ALLOW_RETRY to reduce the mmap_sem hold times
      during I/O.
      
      The only few places that remains uncovered are drivers like v4l and other
      exceptions that tends to work on their own memory and they're not working
      on random user memory (for example like O_DIRECT that uses gup_fast and is
      fully covered by this patch).
      
      A follow up patch should probably also add a printk_once warning to
      get_user_pages that should go obsolete and be phased out eventually.  The
      "vmas" parameter of get_user_pages makes it fundamentally incompatible
      with FAULT_FOLL_ALLOW_RETRY (vmas array becomes meaningless the moment the
      mmap_sem is released).
      
      While this is just an optimization, this becomes an absolute requirement
      for the userfaultfd feature http://lwn.net/Articles/615086/
      
       .
      
      The userfaultfd allows to block the page fault, and in order to do so I
      need to drop the mmap_sem first.  So this patch also ensures that all
      memory where userfaultfd could be registered by KVM, the very first fault
      (no matter if it is a regular page fault, or a get_user_pages) always has
      FAULT_FOLL_ALLOW_RETRY set.  Then the userfaultfd blocks and it is waken
      only when the pagetable is already mapped.  The second fault attempt after
      the wakeup doesn't need FAULT_FOLL_ALLOW_RETRY, so it's ok to retry
      without it.
      
      This patch (of 5):
      
      We can leverage the VM_FAULT_RETRY functionality in the page fault paths
      better by using either get_user_pages_locked or get_user_pages_unlocked.
      
      The former allows conversion of get_user_pages invocations that will have
      to pass a "&locked" parameter to know if the mmap_sem was dropped during
      the call.  Example from:
      
          down_read(&mm->mmap_sem);
          do_something()
          get_user_pages(tsk, mm, ..., pages, NULL);
          up_read(&mm->mmap_sem);
      
      to:
      
          int locked = 1;
          down_read(&mm->mmap_sem);
          do_something()
          get_user_pages_locked(tsk, mm, ..., pages, &locked);
          if (locked)
              up_read(&mm->mmap_sem);
      
      The latter is suitable only as a drop in replacement of the form:
      
          down_read(&mm->mmap_sem);
          get_user_pages(tsk, mm, ..., pages, NULL);
          up_read(&mm->mmap_sem);
      
      into:
      
          get_user_pages_unlocked(tsk, mm, ..., pages);
      
      Where tsk, mm, the intermediate "..." paramters and "pages" can be any
      value as before.  Just the last parameter of get_user_pages (vmas) must be
      NULL for get_user_pages_locked|unlocked to be usable (the latter original
      form wouldn't have been safe anyway if vmas wasn't null, for the former we
      just make it explicit by dropping the parameter).
      
      If vmas is not NULL these two methods cannot be used.
      Signed-off-by: default avatarAndrea Arcangeli <aarcange@redhat.com>
      Reviewed-by: default avatarAndres Lagar-Cavilla <andreslc@google.com>
      Reviewed-by: default avatarPeter Feiner <pfeiner@google.com>
      Reviewed-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      f0818f47
    • Vlastimil Babka's avatar
      mm/mempolicy.c: merge alloc_hugepage_vma to alloc_pages_vma · be97a41b
      Vlastimil Babka authored
      
      
      The previous commit ("mm/thp: Allocate transparent hugepages on local
      node") introduced alloc_hugepage_vma() to mm/mempolicy.c to perform a
      special policy for THP allocations.  The function has the same interface
      as alloc_pages_vma(), shares a lot of boilerplate code and a long
      comment.
      
      This patch merges the hugepage special case into alloc_pages_vma.  The
      extra if condition should be cheap enough price to pay.  We also prevent
      a (however unlikely) race with parallel mems_allowed update, which could
      make hugepage allocation restart only within the fallback call to
      alloc_hugepage_vma() and not reconsider the special rule in
      alloc_hugepage_vma().
      
      Also by making sure mpol_cond_put(pol) is always called before actual
      allocation attempt, we can use a single exit path within the function.
      
      Also update the comment for missing node parameter and obsolete reference
      to mm_sem.
      Signed-off-by: default avatarVlastimil Babka <vbabka@suse.cz>
      Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
      Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      be97a41b
    • Aneesh Kumar K.V's avatar
      mm/thp: allocate transparent hugepages on local node · 077fcf11
      Aneesh Kumar K.V authored
      
      
      This make sure that we try to allocate hugepages from local node if
      allowed by mempolicy.  If we can't, we fallback to small page allocation
      based on mempolicy.  This is based on the observation that allocating
      pages on local node is more beneficial than allocating hugepages on remote
      node.
      
      With this patch applied we may find transparent huge page allocation
      failures if the current node doesn't have enough freee hugepages.  Before
      this patch such failures result in us retrying the allocation on other
      nodes in the numa node mask.
      
      [akpm@linux-foundation.org: fix comment, add CONFIG_TRANSPARENT_HUGEPAGE dependency]
      Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
      Acked-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      077fcf11
    • Joonsoo Kim's avatar
      mm/compaction: add tracepoint to observe behaviour of compaction defer · 24e2716f
      Joonsoo Kim authored
      
      
      Compaction deferring logic is heavy hammer that block the way to the
      compaction.  It doesn't consider overall system state, so it could prevent
      user from doing compaction falsely.  In other words, even if system has
      enough range of memory to compact, compaction would be skipped due to
      compaction deferring logic.  This patch add new tracepoint to understand
      work of deferring logic.  This will also help to check compaction success
      and fail.
      Signed-off-by: default avatarJoonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: David Rientjes <rientjes@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      24e2716f
    • Joonsoo Kim's avatar
      mm/compaction: more trace to understand when/why compaction start/finish · 837d026d
      Joonsoo Kim authored
      It is not well analyzed that when/why compaction start/finish or not.
      With these new tracepoints, we can know much more about start/finish
      reason of compaction.  I can find following bug with these tracepoint.
      
      http://www.spinics.net/lists/linux-mm/msg81582.html
      
      Signed-off-by: default avatarJoonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: David Rientjes <rientjes@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      837d026d
    • Joonsoo Kim's avatar
      mm/compaction: print current range where compaction work · e34d85f0
      Joonsoo Kim authored
      
      
      It'd be useful to know current range where compaction work for detailed
      analysis.  With it, we can know pageblock where we actually scan and
      isolate, and, how much pages we try in that pageblock and can guess why it
      doesn't become freepage with pageblock order roughly.
      Signed-off-by: default avatarJoonsoo Kim <iamjoonsoo.kim@lge.com>
      Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: David Rientjes <rientjes@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e34d85f0
    • Joonsoo Kim's avatar
      mm/compaction: enhance tracepoint output for compaction begin/end · 16c4a097
      Joonsoo Kim authored
      
      
      We now have tracepoint for begin event of compaction and it prints start
      position of both scanners, but, tracepoint for end event of compaction
      doesn't print finish position of both scanners.  It'd be also useful to
      know finish position of both scanners so this patch add it.  It will help
      to find odd behavior or problem on compaction internal logic.
      
      And mode is added to both begin/end tracepoint output, since according to
      mode, compaction behavior is quite different.
      
      And lastly, status format is changed to string rather than status number
      for readability.
      
      [akpm@linux-foundation.org: fix sparse warning]
      Signed-off-by: default avatarJoonsoo Kim <iamjoonsoo.kim@lge.com>
      Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Dan Carpenter <dan.carpenter@oracle.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      16c4a097
    • Joonsoo Kim's avatar
      mm/compaction: change tracepoint format from decimal to hexadecimal · 4645f063
      Joonsoo Kim authored
      
      
      To check the range that compaction is working, tracepoint print
      start/end pfn of zone and start pfn of both scanner with decimal format.
      Since we manage all pages in order of 2 and it is well represented by
      hexadecimal, this patch change the tracepoint format from decimal to
      hexadecimal.  This would improve readability.  For example, it makes us
      easily notice whether current scanner try to compact previously
      attempted pageblock or not.
      Signed-off-by: default avatarJoonsoo Kim <iamjoonsoo.kim@lge.com>
      Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: David Rientjes <rientjes@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      4645f063
    • Konstantin Khebnikov's avatar
      page_writeback: put account_page_redirty() after set_page_dirty() · 8d38633c
      Konstantin Khebnikov authored
      
      
      Helper account_page_redirty() fixes dirty pages counter for redirtied
      pages.  This patch puts it after dirtying and prevents temporary
      underflows of dirtied pages counters on zone/bdi and current->nr_dirtied.
      Signed-off-by: default avatarKonstantin Khebnikov <khlebnikov@yandex-team.ru>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8d38633c
    • Kirill A. Shutemov's avatar
      mm: fix false-positive warning on exit due mm_nr_pmds(mm) · b30fe6c7
      Kirill A. Shutemov authored
      
      
      The problem is that we check nr_ptes/nr_pmds in exit_mmap() which happens
      *before* pgd_free().  And if an arch does pte/pmd allocation in
      pgd_alloc() and frees them in pgd_free() we see offset in counters by the
      time of the checks.
      
      We tried to workaround this by offsetting expected counter value according
      to FIRST_USER_ADDRESS for both nr_pte and nr_pmd in exit_mmap().  But it
      doesn't work in some cases:
      
      1. ARM with LPAE enabled also has non-zero USER_PGTABLES_CEILING, but
         upper addresses occupied with huge pmd entries, so the trick with
         offsetting expected counter value will get really ugly: we will have
         to apply it nr_pmds, but not nr_ptes.
      
      2. Metag has non-zero FIRST_USER_ADDRESS, but doesn't do allocation
         pte/pmd page tables allocation in pgd_alloc(), just setup a pgd entry
         which is allocated at boot and shared accross all processes.
      
      The proposal is to move the check to check_mm() which happens *after*
      pgd_free() and do proper accounting during pgd_alloc() and pgd_free()
      which would bring counters to zero if nothing leaked.
      Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Reported-by: default avatarTyler Baker <tyler.baker@linaro.org>
      Tested-by: default avatarTyler Baker <tyler.baker@linaro.org>
      Tested-by: default avatarNishanth Menon <nm@ti.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: James Hogan <james.hogan@imgtec.com>
      Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b30fe6c7
    • Kirill A. Shutemov's avatar
      mm: account pmd page tables to the process · dc6c9a35
      Kirill A. Shutemov authored
      
      
      Dave noticed that unprivileged process can allocate significant amount of
      memory -- >500 MiB on x86_64 -- and stay unnoticed by oom-killer and
      memory cgroup.  The trick is to allocate a lot of PMD page tables.  Linux
      kernel doesn't account PMD tables to the process, only PTE.
      
      The use-cases below use few tricks to allocate a lot of PMD page tables
      while keeping VmRSS and VmPTE low.  oom_score for the process will be 0.
      
      	#include <errno.h>
      	#include <stdio.h>
      	#include <stdlib.h>
      	#include <unistd.h>
      	#include <sys/mman.h>
      	#include <sys/prctl.h>
      
      	#define PUD_SIZE (1UL << 30)
      	#define PMD_SIZE (1UL << 21)
      
      	#define NR_PUD 130000
      
      	int main(void)
      	{
      		char *addr = NULL;
      		unsigned long i;
      
      		prctl(PR_SET_THP_DISABLE);
      		for (i = 0; i < NR_PUD ; i++) {
      			addr = mmap(addr + PUD_SIZE, PUD_SIZE, PROT_WRITE|PROT_READ,
      					MAP_ANONYMOUS|MAP_PRIVATE, -1, 0);
      			if (addr == MAP_FAILED) {
      				perror("mmap");
      				break;
      			}
      			*addr = 'x';
      			munmap(addr, PMD_SIZE);
      			mmap(addr, PMD_SIZE, PROT_WRITE|PROT_READ,
      					MAP_ANONYMOUS|MAP_PRIVATE|MAP_FIXED, -1, 0);
      			if (addr == MAP_FAILED)
      				perror("re-mmap"), exit(1);
      		}
      		printf("PID %d consumed %lu KiB in PMD page tables\n",
      				getpid(), i * 4096 >> 10);
      		return pause();
      	}
      
      The patch addresses the issue by account PMD tables to the process the
      same way we account PTE.
      
      The main place where PMD tables is accounted is __pmd_alloc() and
      free_pmd_range(). But there're few corner cases:
      
       - HugeTLB can share PMD page tables. The patch handles by accounting
         the table to all processes who share it.
      
       - x86 PAE pre-allocates few PMD tables on fork.
      
       - Architectures with FIRST_USER_ADDRESS > 0. We need to adjust sanity
         check on exit(2).
      
      Accounting only happens on configuration where PMD page table's level is
      present (PMD is not folded).  As with nr_ptes we use per-mm counter.  The
      counter value is used to calculate baseline for badness score by
      oom-killer.
      Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Reported-by: default avatarDave Hansen <dave.hansen@linux.intel.com>
      Cc: Hugh Dickins <hughd@google.com>
      Reviewed-by: default avatarCyrill Gorcunov <gorcunov@openvz.org>
      Cc: Pavel Emelyanov <xemul@openvz.org>
      Cc: David Rientjes <rientjes@google.com>
      Tested-by: default avatarSedat Dilek <sedat.dilek@gmail.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      dc6c9a35
    • Kirill A. Shutemov's avatar
      arm: define __PAGETABLE_PMD_FOLDED for !LPAE · 8aa76875
      Kirill A. Shutemov authored
      
      
      ARM uses custom implementation of PMD folding in 2-level page table case.
      Generic code expects to see __PAGETABLE_PMD_FOLDED to be defined if PMD is
      folded, but ARM doesn't do this.  Let's fix it.
      
      Defining __PAGETABLE_PMD_FOLDED will drop out unused __pmd_alloc().  It
      also fixes problems with recently-introduced pmd accounting on ARM without
      LPAE.
      Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Reported-by: default avatarNishanth Menon <nm@ti.com>
      Reported-by: default avatarSimon Horman <horms@verge.net.au>
      Tested-by: default avatarSimon Horman <horms+renesas@verge.net.au>
      Tested-by: default avatarFabio Estevam <festevam@gmail.com>
      Tested-by: default avatarFelipe Balbi <balbi@ti.com>
      Tested-by: default avatarNishanth Menon <nm@ti.com>
      Tested-by: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
      Tested-by: default avatarKrzysztof Kozlowski <k.kozlowski@samsung.com>
      Tested-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Cyrill Gorcunov <gorcunov@openvz.org>
      Cc: Pavel Emelyanov <xemul@openvz.org>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Russell King <linux@arm.linux.org.uk>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8aa76875
    • Kirill A. Shutemov's avatar
      mm, asm-generic: define PUD_SHIFT in <asm-generic/4level-fixup.h> · 4155b8e0
      Kirill A. Shutemov authored
      
      
      If an architecure uses <asm-generic/4level-fixup.h>, build fails if we
      try to use PUD_SHIFT in generic code:
      
         In file included from arch/microblaze/include/asm/bug.h:1:0,
                          from include/linux/bug.h:4,
                          from include/linux/thread_info.h:11,
                          from include/asm-generic/preempt.h:4,
                          from arch/microblaze/include/generated/asm/preempt.h:1,
                          from include/linux/preempt.h:18,
                          from include/linux/spinlock.h:50,
                          from include/linux/mmzone.h:7,
                          from include/linux/gfp.h:5,
                          from include/linux/slab.h:14,
                          from mm/mmap.c:12:
         mm/mmap.c: In function 'exit_mmap':
      >> mm/mmap.c:2858:46: error: 'PUD_SHIFT' undeclared (first use in this function)
             round_up(FIRST_USER_ADDRESS, PUD_SIZE) >> PUD_SHIFT);
                                                       ^
         include/asm-generic/bug.h:86:25: note: in definition of macro 'WARN_ON'
           int __ret_warn_on = !!(condition);    \
                                  ^
         mm/mmap.c:2858:46: note: each undeclared identifier is reported only once for each function it appears in
             round_up(FIRST_USER_ADDRESS, PUD_SIZE) >> PUD_SHIFT);
                                                       ^
         include/asm-generic/bug.h:86:25: note: in definition of macro 'WARN_ON'
           int __ret_warn_on = !!(condition);    \
                                  ^
      As with <asm-generic/pgtable-nopud.h>, let's define PUD_SHIFT to
      PGDIR_SHIFT.
      Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Reported-by: default avatarWu Fengguang <fengguang.wu@intel.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      4155b8e0
    • Kirill A. Shutemov's avatar
      mm: make FIRST_USER_ADDRESS unsigned long on all archs · d016bf7e
      Kirill A. Shutemov authored
      
      
      LKP has triggered a compiler warning after my recent patch "mm: account
      pmd page tables to the process":
      
          mm/mmap.c: In function 'exit_mmap':
       >> mm/mmap.c:2857:2: warning: right shift count >= width of type [enabled by default]
      
      The code:
      
       > 2857                WARN_ON(mm_nr_pmds(mm) >
         2858                                round_up(FIRST_USER_ADDRESS, PUD_SIZE) >> PUD_SHIFT);
      
      In this, on tile, we have FIRST_USER_ADDRESS defined as 0.  round_up() has
      the same type -- int.  PUD_SHIFT.
      
      I think the best way to fix it is to define FIRST_USER_ADDRESS as unsigned
      long.  On every arch for consistency.
      Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Reported-by: default avatarWu Fengguang <fengguang.wu@intel.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d016bf7e
    • Kirill A. Shutemov's avatar
      microblaze: define __PAGETABLE_PMD_FOLDED · 3ae3ad4e
      Kirill A. Shutemov authored
      
      
      Microblaze uses custom implementation of PMD folding, but doesn't define
      __PAGETABLE_PMD_FOLDED, which generic code expects to see.  Let's fix it.
      
      Defining __PAGETABLE_PMD_FOLDED will drop out unused __pmd_alloc().  It
      also fixes problems with recently-introduced pmd accounting.
      Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Reported-by: default avatarGuenter Roeck <linux@roeck-us.net>
      Tested-by: default avatarGuenter Roeck <linux@roeck-us.net>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      3ae3ad4e
    • Johannes Weiner's avatar
      mm: memcontrol: consolidate swap controller code · 21afa38e
      Johannes Weiner authored
      
      
      The swap controller code is scattered all over the file.  Gather all
      the code that isn't directly needed by the memory controller at the
      end of the file in its own CONFIG_MEMCG_SWAP section.
      Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Cc: Michal Hocko <mhocko@suse.cz>
      Reviewed-by: default avatarVladimir Davydov <vdavydov@parallels.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      21afa38e
    • Johannes Weiner's avatar
      mm: memcontrol: consolidate memory controller initialization · 95a045f6
      Johannes Weiner authored
      
      
      The initialization code for the per-cpu charge stock and the soft
      limit tree is compact enough to inline it into mem_cgroup_init().
      Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
      Reviewed-by: default avatarVladimir Davydov <vdavydov@parallels.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      95a045f6
    • Johannes Weiner's avatar
      mm: memcontrol: simplify soft limit tree init code · 9c608dbe
      Johannes Weiner authored
      
      
      - No need to test the node for N_MEMORY.  node_online() is enough for
        node fallback to work in slab, use NUMA_NO_NODE for everything else.
      
      - Remove the BUG_ON() for allocation failure.  A NULL pointer crash is
        just as descriptive, and the absent return value check is obvious.
      
      - Move local variables to the inner-most blocks.
      
      - Point to the tree structure after its initialized, not before, it's
        just more logical that way.
      Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Cc: Michal Hocko <mhocko@suse.cz>
      Cc: Vladimir Davydov <vdavydov@parallels.com>
      Cc: Guenter Roeck <linux@roeck-us.net>
      Cc: Christoph Lameter <cl@linux-foundation.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      9c608dbe
    • George G. Davis's avatar
      mm: cma: fix totalcma_pages to include DT defined CMA regions · 94737a85
      George G. Davis authored
      
      
      The totalcma_pages variable is not updated to account for CMA regions
      defined via device tree reserved-memory sub-nodes.  Fix this omission by
      moving the calculation of totalcma_pages into cma_init_reserved_mem()
      instead of cma_declare_contiguous() such that it will include reserved
      memory used by all CMA regions.
      Signed-off-by: default avatarGeorge G. Davis <george_davis@mentor.com>
      Cc: Marek Szyprowski <m.szyprowski@samsung.com>
      Acked-by: default avatarMichal Nazarewicz <mina86@mina86.com>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
      Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      94737a85
    • Michal Hocko's avatar
      oom, PM: make OOM detection in the freezer path raceless · c32b3cbe
      Michal Hocko authored
      Commit 5695be14
      
       ("OOM, PM: OOM killed task shouldn't escape PM
      suspend") has left a race window when OOM killer manages to
      note_oom_kill after freeze_processes checks the counter.  The race
      window is quite small and really unlikely and partial solution deemed
      sufficient at the time of submission.
      
      Tejun wasn't happy about this partial solution though and insisted on a
      full solution.  That requires the full OOM and freezer's task freezing
      exclusion, though.  This is done by this patch which introduces oom_sem
      RW lock and turns oom_killer_disable() into a full OOM barrier.
      
      oom_killer_disabled check is moved from the allocation path to the OOM
      level and we take oom_sem for reading for both the check and the whole
      OOM invocation.
      
      oom_killer_disable() takes oom_sem for writing so it waits for all
      currently running OOM killer invocations.  Then it disable all the further
      OOMs by setting oom_killer_disabled and checks for any oom victims.
      Victims are counted via mark_tsk_oom_victim resp.  unmark_oom_victim.  The
      last victim wakes up all waiters enqueued by oom_killer_disable().
      Therefore this function acts as the full OOM barrier.
      
      The page fault path is covered now as well although it was assumed to be
      safe before.  As per Tejun, "We used to have freezing points deep in file
      system code which may be reacheable from page fault." so it would be
      better and more robust to not rely on freezing points here.  Same applies
      to the memcg OOM killer.
      
      out_of_memory tells the caller whether the OOM was allowed to trigger and
      the callers are supposed to handle the situation.  The page allocation
      path simply fails the allocation same as before.  The page fault path will
      retry the fault (more on that later) and Sysrq OOM trigger will simply
      complain to the log.
      
      Normally there wouldn't be any unfrozen user tasks after
      try_to_freeze_tasks so the function will not block. But if there was an
      OOM killer racing with try_to_freeze_tasks and the OOM victim didn't
      finish yet then we have to wait for it. This should complete in a finite
      time, though, because
      
      	- the victim cannot loop in the page fault handler (it would die
      	  on the way out from the exception)
      	- it cannot loop in the page allocator because all the further
      	  allocation would fail and __GFP_NOFAIL allocations are not
      	  acceptable at this stage
      	- it shouldn't be blocked on any locks held by frozen tasks
      	  (try_to_freeze expects lockless context) and kernel threads and
      	  work queues are not frozen yet
      Signed-off-by: default avatarMichal Hocko <mhocko@suse.cz>
      Suggested-by: default avatarTejun Heo <tj@kernel.org>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Cong Wang <xiyou.wangcong@gmail.com>
      Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      c32b3cbe
    • Michal Hocko's avatar
      sysrq: convert printk to pr_* equivalent · 401e4a7c
      Michal Hocko authored
      
      
      While touching this area let's convert printk to pr_*.  This also makes
      the printing of continuation lines done properly.
      Signed-off-by: default avatarMichal Hocko <mhocko@suse.cz>
      Acked-by: default avatarTejun Heo <tj@kernel.org>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Cong Wang <xiyou.wangcong@gmail.com>
      Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      401e4a7c
    • Michal Hocko's avatar
      PM: convert printk to pr_* equivalent · 35536ae1
      Michal Hocko authored
      
      
      While touching this area let's convert printk to pr_*.  This also makes
      the printing of continuation lines done properly.
      Signed-off-by: default avatarMichal Hocko <mhocko@suse.cz>
      Acked-by: default avatarTejun Heo <tj@kernel.org>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Cong Wang <xiyou.wangcong@gmail.com>
      Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      35536ae1
    • Michal Hocko's avatar
      oom: thaw the OOM victim if it is frozen · 63a8ca9b
      Michal Hocko authored
      
      
      oom_kill_process only sets TIF_MEMDIE flag and sends a signal to the
      victim.  This is basically noop when the task is frozen though because the
      task sleeps in the uninterruptible sleep.  The victim is eventually thawed
      later when oom_scan_process_thread meets the task again in a later OOM
      invocation so the OOM killer doesn't live lock.  But this is less than
      optimal.
      
      Let's add __thaw_task into mark_tsk_oom_victim after we set TIF_MEMDIE to
      the victim.  We are not checking whether the task is frozen because that
      would be racy and __thaw_task does that already.  oom_scan_process_thread
      doesn't need to care about freezer anymore as TIF_MEMDIE and freezer are
      excluded completely now.
      Signed-off-by: default avatarMichal Hocko <mhocko@suse.cz>
      Cc: Tejun Heo <tj@kernel.org>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Cong Wang <xiyou.wangcong@gmail.com>
      Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      63a8ca9b
    • Michal Hocko's avatar
      oom: add helpers for setting and clearing TIF_MEMDIE · 49550b60
      Michal Hocko authored
      This patchset addresses a race which was described in the changelog for
      5695be14
      
       ("OOM, PM: OOM killed task shouldn't escape PM suspend"):
      
      : PM freezer relies on having all tasks frozen by the time devices are
      : getting frozen so that no task will touch them while they are getting
      : frozen.  But OOM killer is allowed to kill an already frozen task in order
      : to handle OOM situtation.  In order to protect from late wake ups OOM
      : killer is disabled after all tasks are frozen.  This, however, still keeps
      : a window open when a killed task didn't manage to die by the time
      : freeze_processes finishes.
      
      The original patch hasn't closed the race window completely because that
      would require a more complex solution as it can be seen by this patchset.
      
      The primary motivation was to close the race condition between OOM killer
      and PM freezer _completely_.  As Tejun pointed out, even though the race
      condition is unlikely the harder it would be to debug weird bugs deep in
      the PM freezer when the debugging options are reduced considerably.  I can
      only speculate what might happen when a task is still runnable
      unexpectedly.
      
      On a plus side and as a side effect the oom enable/disable has a better
      (full barrier) semantic without polluting hot paths.
      
      I have tested the series in KVM with 100M RAM:
      - many small tasks (20M anon mmap) which are triggering OOM continually
      - s2ram which resumes automatically is triggered in a loop
      	echo processors > /sys/power/pm_test
      	while true
      	do
      		echo mem > /sys/power/state
      		sleep 1s
      	done
      - simple module which allocates and frees 20M in 8K chunks. If it sees
        freezing(current) then it tries another round of allocation before calling
        try_to_freeze
      - debugging messages of PM stages and OOM killer enable/disable/fail added
        and unmark_oom_victim is delayed by 1s after it clears TIF_MEMDIE and before
        it wakes up waiters.
      - rebased on top of the current mmotm which means some necessary updates
        in mm/oom_kill.c. mark_tsk_oom_victim is now called under task_lock but
        I think this should be OK because __thaw_task shouldn't interfere with any
        locking down wake_up_process. Oleg?
      
      As expected there are no OOM killed tasks after oom is disabled and
      allocations requested by the kernel thread are failing after all the tasks
      are frozen and OOM disabled.  I wasn't able to catch a race where
      oom_killer_disable would really have to wait but I kinda expected the race
      is really unlikely.
      
      [  242.609330] Killed process 2992 (mem_eater) total-vm:24412kB, anon-rss:2164kB, file-rss:4kB
      [  243.628071] Unmarking 2992 OOM victim. oom_victims: 1
      [  243.636072] (elapsed 2.837 seconds) done.
      [  243.641985] Trying to disable OOM killer
      [  243.643032] Waiting for concurent OOM victims
      [  243.644342] OOM killer disabled
      [  243.645447] Freezing remaining freezable tasks ... (elapsed 0.005 seconds) done.
      [  243.652983] Suspending console(s) (use no_console_suspend to debug)
      [  243.903299] kmem_eater: page allocation failure: order:1, mode:0x204010
      [...]
      [  243.992600] PM: suspend of devices complete after 336.667 msecs
      [  243.993264] PM: late suspend of devices complete after 0.660 msecs
      [  243.994713] PM: noirq suspend of devices complete after 1.446 msecs
      [  243.994717] ACPI: Preparing to enter system sleep state S3
      [  243.994795] PM: Saving platform NVS memory
      [  243.994796] Disabling non-boot CPUs ...
      
      The first 2 patches are simple cleanups for OOM.  They should go in
      regardless the rest IMO.
      
      Patches 3 and 4 are trivial printk -> pr_info conversion and they should
      go in ditto.
      
      The main patch is the last one and I would appreciate acks from Tejun and
      Rafael.  I think the OOM part should be OK (except for __thaw_task vs.
      task_lock where a look from Oleg would appreciated) but I am not so sure I
      haven't screwed anything in the freezer code.  I have found several
      surprises there.
      
      This patch (of 5):
      
      This patch is just a preparatory and it doesn't introduce any functional
      change.
      
      Note:
      I am utterly unhappy about lowmemory killer abusing TIF_MEMDIE just to
      wait for the oom victim and to prevent from new killing. This is
      just a side effect of the flag. The primary meaning is to give the oom
      victim access to the memory reserves and that shouldn't be necessary
      here.
      Signed-off-by: default avatarMichal Hocko <mhocko@suse.cz>
      Cc: Tejun Heo <tj@kernel.org>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Cong Wang <xiyou.wangcong@gmail.com>
      Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      49550b60
    • Johannes Weiner's avatar
      mm: memcontrol: fold move_anon() and move_file() · 1dfab5ab
      Johannes Weiner authored
      
      
      Turn the move type enum into flags and give the flags field a shorter
      name.  Once that is done, move_anon() and move_file() are simple enough to
      just fold them into the callsites.
      
      [akpm@linux-foundation.org: tweak MOVE_MASK definition, per Michal]
      Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
      Reviewed-by: default avatarVladimir Davydov <vdavydov@parallels.com>
      Cc: Greg Thelen <gthelen@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      1dfab5ab
    • Johannes Weiner's avatar
      mm: memcontrol: default hierarchy interface for memory · 241994ed
      Johannes Weiner authored
      
      
      Introduce the basic control files to account, partition, and limit
      memory using cgroups in default hierarchy mode.
      
      This interface versioning allows us to address fundamental design
      issues in the existing memory cgroup interface, further explained
      below.  The old interface will be maintained indefinitely, but a
      clearer model and improved workload performance should encourage
      existing users to switch over to the new one eventually.
      
      The control files are thus:
      
        - memory.current shows the current consumption of the cgroup and its
          descendants, in bytes.
      
        - memory.low configures the lower end of the cgroup's expected
          memory consumption range.  The kernel considers memory below that
          boundary to be a reserve - the minimum that the workload needs in
          order to make forward progress - and generally avoids reclaiming
          it, unless there is an imminent risk of entering an OOM situation.
      
        - memory.high configures the upper end of the cgroup's expected
          memory consumption range.  A cgroup whose consumption grows beyond
          this threshold is forced into direct reclaim, to work off the
          excess and to throttle new allocations heavily, but is generally
          allowed to continue and the OOM killer is not invoked.
      
        - memory.max configures the hard maximum amount of memory that the
          cgroup is allowed to consume before the OOM killer is invoked.
      
        - memory.events shows event counters that indicate how often the
          cgroup was reclaimed while below memory.low, how often it was
          forced to reclaim excess beyond memory.high, how often it hit
          memory.max, and how often it entered OOM due to memory.max.  This
          allows users to identify configuration problems when observing a
          degradation in workload performance.  An overcommitted system will
          have an increased rate of low boundary breaches, whereas increased
          rates of high limit breaches, maximum hits, or even OOM situations
          will indicate internally overcommitted cgroups.
      
      For existing users of memory cgroups, the following deviations from
      the current interface are worth pointing out and explaining:
      
        - The original lower boundary, the soft limit, is defined as a limit
          that is per default unset.  As a result, the set of cgroups that
          global reclaim prefers is opt-in, rather than opt-out.  The costs
          for optimizing these mostly negative lookups are so high that the
          implementation, despite its enormous size, does not even provide
          the basic desirable behavior.  First off, the soft limit has no
          hierarchical meaning.  All configured groups are organized in a
          global rbtree and treated like equal peers, regardless where they
          are located in the hierarchy.  This makes subtree delegation
          impossible.  Second, the soft limit reclaim pass is so aggressive
          that it not just introduces high allocation latencies into the
          system, but also impacts system performance due to overreclaim, to
          the point where the feature becomes self-defeating.
      
          The memory.low boundary on the other hand is a top-down allocated
          reserve.  A cgroup enjoys reclaim protection when it and all its
          ancestors are below their low boundaries, which makes delegation
          of subtrees possible.  Secondly, new cgroups have no reserve per
          default and in the common case most cgroups are eligible for the
          preferred reclaim pass.  This allows the new low boundary to be
          efficiently implemented with just a minor addition to the generic
          reclaim code, without the need for out-of-band data structures and
          reclaim passes.  Because the generic reclaim code considers all
          cgroups except for the ones running low in the preferred first
          reclaim pass, overreclaim of individual groups is eliminated as
          well, resulting in much better overall workload performance.
      
        - The original high boundary, the hard limit, is defined as a strict
          limit that can not budge, even if the OOM killer has to be called.
          But this generally goes against the goal of making the most out of
          the available memory.  The memory consumption of workloads varies
          during runtime, and that requires users to overcommit.  But doing
          that with a strict upper limit requires either a fairly accurate
          prediction of the working set size or adding slack to the limit.
          Since working set size estimation is hard and error prone, and
          getting it wrong results in OOM kills, most users tend to err on
          the side of a looser limit and end up wasting precious resources.
      
          The memory.high boundary on the other hand can be set much more
          conservatively.  When hit, it throttles allocations by forcing
          them into direct reclaim to work off the excess, but it never
          invokes the OOM killer.  As a result, a high boundary that is
          chosen too aggressively will not terminate the processes, but
          instead it will lead to gradual performance degradation.  The user
          can monitor this and make corrections until the minimal memory
          footprint that still gives acceptable performance is found.
      
          In extreme cases, with many concurrent allocations and a complete
          breakdown of reclaim progress within the group, the high boundary
          can be exceeded.  But even then it's mostly better to satisfy the
          allocation from the slack available in other groups or the rest of
          the system than killing the group.  Otherwise, memory.max is there
          to limit this type of spillover and ultimately contain buggy or
          even malicious applications.
      
        - The original control file names are unwieldy and inconsistent in
          many different ways.  For example, the upper boundary hit count is
          exported in the memory.failcnt file, but an OOM event count has to
          be manually counted by listening to memory.oom_control events, and
          lower boundary / soft limit events have to be counted by first
          setting a threshold for that value and then counting those events.
          Also, usage and limit files encode their units in the filename.
          That makes the filenames very long, even though this is not
          information that a user needs to be reminded of every time they
          type out those names.
      
          To address these naming issues, as well as to signal clearly that
          the new interface carries a new configuration model, the naming
          conventions in it necessarily differ from the old interface.
      
        - The original limit files indicate the state of an unset limit with
          a very high number, and a configured limit can be unset by echoing
          -1 into those files.  But that very high number is implementation
          and architecture dependent and not very descriptive.  And while -1
          can be understood as an underflow into the highest possible value,
          -2 or -10M etc. do not work, so it's not inconsistent.
      
          memory.low, memory.high, and memory.max will use the string
          "infinity" to indicate and set the highest possible value.
      
      [akpm@linux-foundation.org: use seq_puts() for basic strings]
      Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
      Cc: Vladimir Davydov <vdavydov@parallels.com>
      Cc: Greg Thelen <gthelen@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      241994ed
    • Johannes Weiner's avatar
      mm: page_counter: pull "-1" handling out of page_counter_memparse() · 650c5e56
      Johannes Weiner authored
      
      
      The unified hierarchy interface for memory cgroups will no longer use "-1"
      to mean maximum possible resource value.  In preparation for this, make
      the string an argument and let the caller supply it.
      Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
      Cc: Vladimir Davydov <vdavydov@parallels.com>
      Cc: Greg Thelen <gthelen@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      650c5e56
    • Juergen Gross's avatar
      mm: use correct format specifiers when printing address ranges · 8d29e18a
      Juergen Gross authored
      
      
      Especially on 32 bit kernels memory node ranges are printed with 32 bit
      wide addresses only.  Use u64 types and %llx specifiers to print full
      width of addresses.
      Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8d29e18a
    • Greg Thelen's avatar
      memcg: add BUILD_BUG_ON() for string tables · 0ca44b14
      Greg Thelen authored
      
      
      Use BUILD_BUG_ON() to compile assert that memcg string tables are in sync
      with corresponding enums.  There aren't currently any issues with these
      tables.  This is just defensive.
      Signed-off-by: default avatarGreg Thelen <gthelen@google.com>
      Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      0ca44b14
    • Vladimir Davydov's avatar
      vmscan: force scan offline memory cgroups · 90cbc250
      Vladimir Davydov authored
      Since commit b2052564
      
       ("mm: memcontrol: continue cache reclaim from
      offlined groups") pages charged to a memory cgroup are not reparented when
      the cgroup is removed.  Instead, they are supposed to be reclaimed in a
      regular way, along with pages accounted to online memory cgroups.
      
      However, an lruvec of an offline memory cgroup will sooner or later get so
      small that it will be scanned only at low scan priorities (see
      get_scan_count()).  Therefore, if there are enough reclaimable pages in
      big lruvecs, pages accounted to offline memory cgroups will never be
      scanned at all, wasting memory.
      
      Fix this by unconditionally forcing scanning dead lruvecs from kswapd.
      
      [akpm@linux-foundation.org: fix build]
      Signed-off-by: default avatarVladimir Davydov <vdavydov@parallels.com>
      Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
      Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Cc: Tejun Heo <tj@kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      90cbc250
    • Kirill A. Shutemov's avatar
      mm: more checks on free_pages_prepare() for tail pages · 81422f29
      Kirill A. Shutemov authored
      
      
      Although it was not called, destroy_compound_page() did some potentially
      useful checks.  Let's re-introduce them in free_pages_prepare(), where
      they can be actually triggered when CONFIG_DEBUG_VM=y.
      
      compound_order() assert is already in free_pages_prepare().  We have few
      checks for tail pages left.
      Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      81422f29
    • Kirill A. Shutemov's avatar
      mm/page_alloc.c: drop dead destroy_compound_page() · 6e9f0d58
      Kirill A. Shutemov authored
      
      
      The only caller is __free_one_page(). By the time we should have
      page->flags to be cleared already:
      
       - for 0-order pages though PCP list:
      	free_hot_cold_page()
      		free_pages_prepare()
      			free_pages_check()
      				page->flags &= ~PAGE_FLAGS_CHECK_AT_PREP;
      		<put the page to PCP list>
      
      	free_pcppages_bulk()
      		page = <withdraw pages from PCP list>
      		__free_one_page(page)
      
       - for non-0-order pages:
      	__free_pages_ok()
      		free_pages_prepare()
      			free_pages_check()
      				page->flags &= ~PAGE_FLAGS_CHECK_AT_PREP;
      		free_one_page()
      			__free_one_page()
      
      So there's no way PageCompound() will return true in __free_one_page().
      Let's remove dead destroy_compound_page() and put assert for page->flags
      there instead.
      Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Cc: Vlastimil Babka <vbabka@suse.cz>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      6e9f0d58
    • Vlastimil Babka's avatar
      mm: microoptimize zonelist operations · 05891fb0
      Vlastimil Babka authored
      
      
      next_zones_zonelist() returns a zoneref pointer, as well as a zone pointer
      via extra parameter.  Since the latter can be trivially obtained by
      dereferencing the former, the overhead of the extra parameter is
      unjustified.
      
      This patch thus removes the zone parameter from next_zones_zonelist().
      Both callers happen to be in the same header file, so it's simple to add
      the zoneref dereference inline.  We save some bytes of code size.
      
      add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-105 (-105)
      function                                     old     new   delta
      nr_free_zone_pages                           129     115     -14
      __alloc_pages_nodemask                      2300    2285     -15
      get_page_from_freelist                      2652    2576     -76
      
      add/remove: 0/0 grow/shrink: 1/0 up/down: 10/0 (10)
      function                                     old     new   delta
      try_to_compact_pages                         569     579     +10
      Signed-off-by: default avatarVlastimil Babka <vbabka@suse.cz>
      C...
      05891fb0
    • Vlastimil Babka's avatar
      mm: reduce try_to_compact_pages parameters · 1a6d53a1
      Vlastimil Babka authored
      
      
      Expand the usage of the struct alloc_context introduced in the previous
      patch also for calling try_to_compact_pages(), to reduce the number of its
      parameters.  Since the function is in different compilation unit, we need
      to move alloc_context definition in the shared mm/internal.h header.
      
      With this change we get simpler code and small savings of code size and stack
      usage:
      
      add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-27 (-27)
      function                                     old     new   delta
      __alloc_pages_direct_compact                 283     256     -27
      add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-13 (-13)
      function                                     old     new   delta
      try_to_compact_pages                         582     569     -13
      
      Stack usage of __alloc_pages_direct_compact goes from 24 to none (per
      scripts/checkstack.pl).
      Signed-off-by: default avatarVlastimil Babka <vbabka@suse.cz>
      Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
      Cc: Minchan Kim <minchan@kernel.org>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
      Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      1a6d53a1
    • Vlastimil Babka's avatar
      mm, page_alloc: reduce number of alloc_pages* functions' parameters · a9263751
      Vlastimil Babka authored
      
      
      Introduce struct alloc_context to accumulate the numerous parameters
      passed between the alloc_pages* family of functions and
      get_page_from_freelist().  This excludes gfp_flags and alloc_info, which
      mutate too much along the way, and allocation order, which is conceptually
      different.
      
      The result is shorter function signatures, as well as overal code size and
      stack usage reductions.
      
      bloat-o-meter:
      
      add/remove: 0/0 grow/shrink: 1/2 up/down: 127/-310 (-183)
      function                                     old     new   delta
      get_page_from_freelist                      2525    2652    +127
      __alloc_pages_direct_compact                 329     283     -46
      __alloc_pages_nodemask                      2564    2300    -264
      
      checkstack.pl:
      
      function                            old    new
      __alloc_pages_nodemask              248    200
      get_page_from_freelist              168    184
      __alloc_pages_direct_compact         40     24
      Signed-off-by: default avatarVlastimil Babka <vbabka@suse.cz>
      Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
      Cc: Minchan Kim <minchan@kernel.org>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
      Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      a9263751
    • Vlastimil Babka's avatar
      mm: set page->pfmemalloc in prep_new_page() · 75379191
      Vlastimil Babka authored
      The possibility of replacing the numerous parameters of alloc_pages*
      functions with a single structure has been discussed when Minchan proposed
      to expand the x86 kernel stack [1].  This series implements the change,
      along with few more cleanups/microoptimizations.
      
      The series is based on next-20150108 and I used gcc 4.8.3 20140627 on
      openSUSE 13.2 for compiling.  Config includess NUMA and COMPACTION.
      
      The core change is the introduction of a new struct alloc_context, which looks
      like this:
      
      struct alloc_context {
              struct zonelist *zonelist;
              nodemask_t *nodemask;
              struct zone *preferred_zone;
              int classzone_idx;
              int migratetype;
              enum zone_type high_zoneidx;
      };
      
      All the contents is mostly constant, except that __alloc_pages_slowpath()
      changes preferred_zone, classzone_idx and potentially zonelist.  But
      that's not a problem in case control returns to retry_cpuset: in
      __alloc_pages_nodemask(), those will be reset to initial values again
      (although it's a bit subtle).  On the other hand, gfp_flags and alloc_info
      mutate so much that it doesn't make sense to put them into alloc_context.
      Still, the result is one parameter instead of up to 7.  This is all in
      Patch 2.
      
      Patch 3 is a step to expand alloc_context usage out of page_alloc.c
      itself.  The function try_to_compact_pages() can also much benefit from
      the parameter reduction, but it means the struct definition has to be
      moved to a shared header.
      
      Patch 1 should IMHO be included even if the rest is deemed not useful
      enough.  It improves maintainability and also has some code/stack
      reduction.  Patch 4 is OTOH a tiny optimization.
      
      Overall bloat-o-meter results:
      
      add/remove: 0/0 grow/shrink: 0/4 up/down: 0/-460 (-460)
      function                                     old     new   delta
      nr_free_zone_pages                           129     115     -14
      __alloc_pages_direct_compact                 329     256     -73
      get_page_from_freelist                      2670    2576     -94
      __alloc_pages_nodemask                      2564    2285    -279
      try_to_compact_pages                         582     579      -3
      
      Overall stack sizes per ./scripts/checkstack.pl:
      
                                old   new delta
      get_page_from_freelist:   184   184     0
      __alloc_pages_nodemask    248   200   -48
      __alloc_pages_direct_c     40     -   -40
      try_to_compact_pages       72    72     0
                                            -88
      
      [1] http://marc.info/?l=linux-mm&m=140142462528257&w=2
      
      This patch (of 4):
      
      prep_new_page() sets almost everything in the struct page of the page
      being allocated, except page->pfmemalloc.  This is not obvious and has at
      least once led to a bug where page->pfmemalloc was forgotten to be set
      correctly, see commit 8fb74b9f
      
       ("mm: compaction: partially revert
      capture of suitable high-order page").
      
      This patch moves the pfmemalloc setting to prep_new_page(), which means it
      needs to gain alloc_flags parameter.  The call to prep_new_page is moved
      from buffered_rmqueue() to get_page_from_freelist(), which also leads to
      simpler code.  An obsolete comment for buffered_rmqueue() is replaced.
      
      In addition to better maintainability there is a small reduction of code
      and stack usage for get_page_from_freelist(), which inlines the other
      functions involved.
      
      add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-145 (-145)
      function                                     old     new   delta
      get_page_from_freelist                      2670    2525    -145
      
      Stack usage is reduced from 184 to 168 bytes.
      Signed-off-by: default avatarVlastimil Babka <vbabka@suse.cz>
      Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
      Cc: Minchan Kim <minchan@kernel.org>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
      Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      75379191
    • Kirill A. Shutemov's avatar
      sparc32: fix broken set_pte() · 4ecf8860
      Kirill A. Shutemov authored
      32-bit sparc uses swap instruction to implement set_pte().  It called
      using GCC inline assembler.  But it misses the "memory" clobber to
      indicate that pte value will be updated in memory.
      
      As result GCC doesn't know that it cannot postpone pte pointer dereference
      which occurs before set_pte() to post-set_pte() time.
      
      It leads to real-world bugs -- [1]. In this situation we have code:
      
      	ptent = ptep_modify_prot_start(mm, addr, pte);
      	ptent = pte_modify(ptent, newprot);
      	...
      	ptep_modify_prot_commit(mm, addr, pte, ptent);
      
      ptep_modify_prot_start() in sparc case is just 'pte' dereference plus
      pte_clear().  pte_clear() calls broken set_pte().  GCC thinks it's valid
      to dereference 'pte' again on pte_modify() and gets cleared pte.
      ptep_modify_prot_commit() puts 'pteent' with pfn==0 back to page table,
      which eventually leads to the crash.
      
      [1] http://lkml.kernel.org/r/54C06B19.8060305@roeck-us.net
      
      Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Reported-by: default avatarGuenter Roeck <linux@roeck-us.net>
      Tested-by: default avatarGuenter Roeck <linux@roeck-us.net>
      Cc: Paul Moore <pmoore@redhat.com>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: David Miller <davem@davemloft.net>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      4ecf8860
    • Naoya Horiguchi's avatar
      mm/hugetlb: add migration entry check in __unmap_hugepage_range · 9fbc1f63
      Naoya Horiguchi authored
      If __unmap_hugepage_range() tries to unmap the address range over which
      hugepage migration is on the way, we get the wrong page because pte_page()
      doesn't work for migration entries.  This patch simply clears the pte for
      migration entries as we do for hwpoison entries.
      
      Fixes: 290408d4
      
       ("hugetlb: hugepage migration core")
      Signed-off-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: James Hogan <james.hogan@imgtec.com>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Mel Gorman <mel@csn.ul.ie>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Michal Hocko <mhocko@suse.cz>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Cc: Luiz Capitulino <lcapitulino@redhat.com>
      Cc: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
      Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
      Cc: Steve Capper <steve.capper@linaro.org>
      Cc: <stable@vger.kernel.org>	[2.6.36+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      9fbc1f63
    • Naoya Horiguchi's avatar
      mm/hugetlb: add migration/hwpoisoned entry check in hugetlb_change_protection · a8bda28d
      Naoya Horiguchi authored
      There is a race condition between hugepage migration and
      change_protection(), where hugetlb_change_protection() doesn't care about
      migration entries and wrongly overwrites them.  That causes unexpected
      results like kernel crash.  HWPoison entries also can cause the same
      problem.
      
      This patch adds is_hugetlb_entry_(migration|hwpoisoned) check in this
      function to do proper actions.
      
      Fixes: 290408d4
      
       ("hugetlb: hugepage migration core")
      Signed-off-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: James Hogan <james.hogan@imgtec.com>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Mel Gorman <mel@csn.ul.ie>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Cc: Michal Hocko <mhocko@suse.cz>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Cc: Luiz Capitulino <lcapitulino@redhat.com>
      Cc: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
      Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
      Cc: Steve Capper <steve.capper@linaro.org>
      Cc: <stable@vger.kernel.org>	[2.6.36+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      a8bda28d