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  1. Jan 09, 2006
    • Andrew Morton's avatar
      [PATCH] Abandon gcc-2.95.x · fd285bb5
      Andrew Morton authored
      
      There's one scsi driver which doesn't compile due to weird __VA_ARGS__ tricks
      and the rather useful scsi/sd.c is currently getting an ICE.  None of the new
      SAS code compiles, due to extensive use of anonymous unions.  The V4L guys are
      very good at exploiting the gcc-2.95.x macro expansion bug (_why_ does each
      driver need to implement its own debug macros?) and various people keep on
      sneaking in anonymous unions, which are rather nice.
      
      Plus anonymous unions are rather useful.
      
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      fd285bb5
    • Paul Jackson's avatar
      [PATCH] cpuset: remove test for null cpuset from alloc code path · c417f024
      Paul Jackson authored
      
      Remove a couple of more lines of code from the cpuset hooks in the page
      allocation code path.
      
      There was a check for a NULL cpuset pointer in the routine
      cpuset_update_task_memory_state() that was only needed during system boot,
      after the memory subsystem was initialized, before the cpuset subsystem was
      initialized, to catch a NULL task->cpuset pointer.
      
      Add a cpuset_init_early() routine, just before the mem_init() call in
      init/main.c, that sets up just enough of the init tasks cpuset structure to
      render cpuset_update_task_memory_state() calls harmless.
      
      Signed-off-by: default avatarPaul Jackson <pj@sgi.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      c417f024
    • Matt Mackall's avatar
      [PATCH] slob: introduce the SLOB allocator · 10cef602
      Matt Mackall authored
      
      configurable replacement for slab allocator
      
      This adds a CONFIG_SLAB option under CONFIG_EMBEDDED.  When CONFIG_SLAB is
      disabled, the kernel falls back to using the 'SLOB' allocator.
      
      SLOB is a traditional K&R/UNIX allocator with a SLAB emulation layer,
      similar to the original Linux kmalloc allocator that SLAB replaced.  It's
      signicantly smaller code and is more memory efficient.  But like all
      similar allocators, it scales poorly and suffers from fragmentation more
      than SLAB, so it's only appropriate for small systems.
      
      It's been tested extensively in the Linux-tiny tree.  I've also
      stress-tested it with make -j 8 compiles on a 3G SMP+PREEMPT box (not
      recommended).
      
      Here's a comparison for otherwise identical builds, showing SLOB saving
      nearly half a megabyte of RAM:
      
      $ size vmlinux*
         text    data     bss     dec     hex filename
      3336372  529360  190812 4056544  3de5e0 vmlinux-slab
      3323208  527948  190684 4041840  3dac70 vmlinux-slob
      
      $ size mm/{slab,slob}.o
         text    data     bss     dec     hex filename
        13221     752      48   14021    36c5 mm/slab.o
         1896      52       8    1956     7a4 mm/slob.o
      
      /proc/meminfo:
                        SLAB          SLOB      delta
      MemTotal:        27964 kB      27980 kB     +16 kB
      MemFree:         24596 kB      25092 kB    +496 kB
      Buffers:            36 kB         36 kB       0 kB
      Cached:           1188 kB       1188 kB       0 kB
      SwapCached:          0 kB          0 kB       0 kB
      Active:            608 kB        600 kB      -8 kB
      Inactive:          808 kB        812 kB      +4 kB
      HighTotal:           0 kB          0 kB       0 kB
      HighFree:            0 kB          0 kB       0 kB
      LowTotal:        27964 kB      27980 kB     +16 kB
      LowFree:         24596 kB      25092 kB    +496 kB
      SwapTotal:           0 kB          0 kB       0 kB
      SwapFree:            0 kB          0 kB       0 kB
      Dirty:               4 kB         12 kB      +8 kB
      Writeback:           0 kB          0 kB       0 kB
      Mapped:            560 kB        556 kB      -4 kB
      Slab:             1756 kB          0 kB   -1756 kB
      CommitLimit:     13980 kB      13988 kB      +8 kB
      Committed_AS:     4208 kB       4208 kB       0 kB
      PageTables:         28 kB         28 kB       0 kB
      VmallocTotal:  1007312 kB    1007312 kB       0 kB
      VmallocUsed:        48 kB         48 kB       0 kB
      VmallocChunk:  1007264 kB    1007264 kB       0 kB
      
      (this work has been sponsored in part by CELF)
      
      From: Ingo Molnar <mingo@elte.hu>
      
         Fix 32-bitness bugs in mm/slob.c.
      
      Signed-off-by: default avatarMatt Mackall <mpm@selenic.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      10cef602
  2. Jan 06, 2006
  3. Jan 05, 2006
  4. Jan 03, 2006
  5. Dec 26, 2005
  6. Dec 20, 2005
  7. Dec 15, 2005
    • Linus Torvalds's avatar
      Move size optimization option outside of EMBEDDED menu, mark it EXPERIMENTAL · c45b4f1f
      Linus Torvalds authored
      
      Also, disable on sparc64 - a number of people report breakage.  Probably
      a compiler bug, but it's quite possible that it tickles some latent
      kernel problem too.
      
      It still defaults to 'y' everywhere else (when enabled through
      EXPERIMENTAL), and Dave Jones points out that Fedora (and RHEL4) has
      been building with size optimizations for a long time on x86, x86-64,
      ia64, s390, s390x, ppc32 and ppc64.  So it is really only moderately
      experimental, but the sparc64 breakage certainly shows that it can
      trigger "issues".
      
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      c45b4f1f
  8. Dec 13, 2005
  9. Nov 09, 2005
    • Nick Piggin's avatar
      [PATCH] sched: disable preempt in idle tasks · 5bfb5d69
      Nick Piggin authored
      
      Run idle threads with preempt disabled.
      
      Also corrected a bugs in arm26's cpu_idle (make it actually call schedule()).
      How did it ever work before?
      
      Might fix the CPU hotplugging hang which Nigel Cunningham noted.
      
      We think the bug hits if the idle thread is preempted after checking
      need_resched() and before going to sleep, then the CPU offlined.
      
      After calling stop_machine_run, the CPU eventually returns from preemption and
      into the idle thread and goes to sleep.  The CPU will continue executing
      previous idle and have no chance to call play_dead.
      
      By disabling preemption until we are ready to explicitly schedule, this bug is
      fixed and the idle threads generally become more robust.
      
      From: alexs <ashepard@u.washington.edu>
      
        PPC build fix
      
      From: Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
      
        MIPS build fix
      
      Signed-off-by: default avatarNick Piggin <npiggin@suse.de>
      Signed-off-by: default avatarYoichi Yuasa <yuasa@hh.iij4u.or.jp>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      5bfb5d69
  10. Nov 04, 2005
  11. Nov 01, 2005
  12. Oct 31, 2005
  13. Sep 13, 2005
  14. Sep 07, 2005
  15. Sep 02, 2005
  16. Aug 29, 2005
  17. Aug 10, 2005
  18. Jul 29, 2005
  19. Jul 27, 2005
  20. Jul 26, 2005
  21. Jul 14, 2005
  22. Jul 12, 2005
  23. Jul 11, 2005
  24. Jun 30, 2005
    • Jay Lan's avatar
      [PATCH] Improper initrd failure message at boot time · f220ab2a
      Jay Lan authored
      
      On system boot up, there was an failure reported to boot.msg:
      
           <5>Trying to move old root to /initrd ... failed
      
      According to initrd(4) man page, step #7 of BOOT-UP OPERATION
      is described as below:
                7. If the normal root file has directory /initrd, device
                /dev/ram0 is moved from  /  to  /initrd.   Otherwise  if
                directory  /initrd  does  not  exist device /dev/ram0 is
                unmounted.
      
      We got service calls from customers concerning about this failure message
      at boot time.  Many systems do not have /initrd and thus the message can be
      changed in the case of non-existing /initrd so that it does not sound like
      a failure of the system.
      
      Signed-off-by: default avatarJay Lan <jlan@sgi.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      f220ab2a
  25. Jun 28, 2005
  26. Jun 25, 2005
  27. Jun 23, 2005
    • Venkatesh Pallipadi's avatar
      [PATCH] Platform SMIs and their interferance with tsc based delay calibration · 8a9e1b0f
      Venkatesh Pallipadi authored
      
      Issue:
      Current tsc based delay_calibration can result in significant errors in
      loops_per_jiffy count when the platform events like SMIs
      (System Management Interrupts that are non-maskable) are present. This could
      lead to potential kernel panic(). This issue is becoming more visible with 2.6
      kernel (as default HZ is 1000) and on platforms with higher SMI handling
      latencies. During the boot time, SMIs are mostly used by BIOS (for things
      like legacy keyboard emulation).
      
      Description:
      The psuedocode for current delay calibration with tsc based delay looks like
      (0) Estimate a value for loops_per_jiffy
      (1) While (loops_per_jiffy estimate is accurate enough)
      (2)   wait for jiffy transition (jiffy1)
      (3)   Note down current tsc (tsc1)
      (4)   loop until tsc becomes tsc1 + loops_per_jiffy
      (5)   check whether jiffy changed since jiffy1 or not and refine
      loops_per_jiffy estimate
      
      Consider the following cases
      Case 1:
      If SMIs happen between (2) and (3) above, we can end up with a
      loops_per_jiffy value that is too low. This results in shorted delays and
      kernel can panic () during boot (Mostly at IOAPIC timer initialization
      timer_irq_works() as we don't have enough timer interrupts in a specified
      interval).
      
      Case 2:
      If SMIs happen between (3) and (4) above, then we can end up with a
      loops_per_jiffy value that is too high. And with current i386 code, too
      high lpj value (greater than 17M) can result in a overflow in
      delay.c:__const_udelay() again resulting in shorter delay and panic().
      
      Solution:
      The patch below makes the calibration routine aware of asynchronous events
      like SMIs. We increase the delay calibration time and also identify any
      significant errors (greater than 12.5%) in the calibration and notify it to
      user.
      
      Patch below changes both i386 and x86-64 architectures to use this
      new and improved calibrate_delay_direct() routine.
      
      Signed-off-by: default avatarVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
      Signed-off-by: default avatarAdrian Bunk <bunk@stusta.de>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      8a9e1b0f
  28. Jun 22, 2005
    • Christoph Lameter's avatar
      [PATCH] node local per-cpu-pages · e7c8d5c9
      Christoph Lameter authored
      
      This patch modifies the way pagesets in struct zone are managed.
      
      Each zone has a per-cpu array of pagesets.  So any particular CPU has some
      memory in each zone structure which belongs to itself.  Even if that CPU is
      not local to that zone.
      
      So the patch relocates the pagesets for each cpu to the node that is nearest
      to the cpu instead of allocating the pagesets in the (possibly remote) target
      zone.  This means that the operations to manage pages on remote zone can be
      done with information available locally.
      
      We play a macro trick so that non-NUMA pmachines avoid the additional
      pointer chase on the page allocator fastpath.
      
      AIM7 benchmark on a 32 CPU SGI Altix
      
      w/o patches:
      Tasks    jobs/min  jti  jobs/min/task      real       cpu
          1      484.68  100       484.6769     12.01      1.97   Fri Mar 25 11:01:42 2005
        100    27140.46   89       271.4046     21.44    148.71   Fri Mar 25 11:02:04 2005
        200    30792.02   82       153.9601     37.80    296.72   Fri Mar 25 11:02:42 2005
        300    32209.27   81       107.3642     54.21    451.34   Fri Mar 25 11:03:37 2005
        400    34962.83   78        87.4071     66.59    588.97   Fri Mar 25 11:04:44 2005
        500    31676.92   75        63.3538     91.87    742.71   Fri Mar 25 11:06:16 2005
        600    36032.69   73        60.0545     96.91    885.44   Fri Mar 25 11:07:54 2005
        700    35540.43   77        50.7720    114.63   1024.28   Fri Mar 25 11:09:49 2005
        800    33906.70   74        42.3834    137.32   1181.65   Fri Mar 25 11:12:06 2005
        900    34120.67   73        37.9119    153.51   1325.26   Fri Mar 25 11:14:41 2005
       1000    34802.37   74        34.8024    167.23   1465.26   Fri Mar 25 11:17:28 2005
      
      with slab API changes and pageset patch:
      
      Tasks    jobs/min  jti  jobs/min/task      real       cpu
          1      485.00  100       485.0000     12.00      1.96   Fri Mar 25 11:46:18 2005
        100    28000.96   89       280.0096     20.79    150.45   Fri Mar 25 11:46:39 2005
        200    32285.80   79       161.4290     36.05    293.37   Fri Mar 25 11:47:16 2005
        300    40424.15   84       134.7472     43.19    438.42   Fri Mar 25 11:47:59 2005
        400    39155.01   79        97.8875     59.46    590.05   Fri Mar 25 11:48:59 2005
        500    37881.25   82        75.7625     76.82    730.19   Fri Mar 25 11:50:16 2005
        600    39083.14   78        65.1386     89.35    872.79   Fri Mar 25 11:51:46 2005
        700    38627.83   77        55.1826    105.47   1022.46   Fri Mar 25 11:53:32 2005
        800    39631.94   78        49.5399    117.48   1169.94   Fri Mar 25 11:55:30 2005
        900    36903.70   79        41.0041    141.94   1310.78   Fri Mar 25 11:57:53 2005
       1000    36201.23   77        36.2012    160.77   1458.31   Fri Mar 25 12:00:34 2005
      
      Signed-off-by: default avatarChristoph Lameter <clameter@sgi.com>
      Signed-off-by: default avatarShobhit Dayal <shobhit@calsoftinc.com>
      Signed-off-by: default avatarShai Fultheim <Shai@Scalex86.org>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      e7c8d5c9
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