Commit abb8206c authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Linus Torvalds
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hugetlb/cgroup: add hugetlb cgroup control files



Add the control files for hugetlb controller

[akpm@linux-foundation.org: s/CONFIG_CGROUP_HUGETLB_RES_CTLR/CONFIG_MEMCG_HUGETLB/g]
[akpm@linux-foundation.org: s/CONFIG_MEMCG_HUGETLB/CONFIG_CGROUP_HUGETLB/]
Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: David Rientjes <rientjes@google.com>
Acked-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hillf Danton <dhillf@gmail.com>
Reviewed-by: default avatarMichal Hocko <mhocko@suse.cz>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent da1def55
......@@ -4,6 +4,7 @@
#include <linux/mm_types.h>
#include <linux/fs.h>
#include <linux/hugetlb_inline.h>
#include <linux/cgroup.h>
struct ctl_table;
struct user_struct;
......@@ -221,6 +222,10 @@ struct hstate {
unsigned int nr_huge_pages_node[MAX_NUMNODES];
unsigned int free_huge_pages_node[MAX_NUMNODES];
unsigned int surplus_huge_pages_node[MAX_NUMNODES];
#ifdef CONFIG_CGROUP_HUGETLB
/* cgroup control files */
struct cftype cgroup_files[5];
#endif
char name[HSTATE_NAME_LEN];
};
......
......@@ -62,6 +62,7 @@ extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
struct page *page);
extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg);
extern int hugetlb_cgroup_file_init(int idx) __init;
#else
static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
......@@ -108,5 +109,10 @@ hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
return;
}
static inline int __init hugetlb_cgroup_file_init(int idx)
{
return 0;
}
#endif /* CONFIG_MEM_RES_CTLR_HUGETLB */
#endif
......@@ -30,6 +30,7 @@
#include <linux/hugetlb.h>
#include <linux/hugetlb_cgroup.h>
#include <linux/node.h>
#include <linux/hugetlb_cgroup.h>
#include "internal.h"
const unsigned long hugetlb_zero = 0, hugetlb_infinity = ~0UL;
......@@ -1930,6 +1931,13 @@ void __init hugetlb_add_hstate(unsigned order)
h->next_nid_to_free = first_node(node_states[N_HIGH_MEMORY]);
snprintf(h->name, HSTATE_NAME_LEN, "hugepages-%lukB",
huge_page_size(h)/1024);
/*
* Add cgroup control files only if the huge page consists
* of more than two normal pages. This is because we use
* page[2].lru.next for storing cgoup details.
*/
if (order >= HUGETLB_CGROUP_MIN_ORDER)
hugetlb_cgroup_file_init(hugetlb_max_hstate - 1);
parsed_hstate = h;
}
......
......@@ -26,6 +26,10 @@ struct hugetlb_cgroup {
struct res_counter hugepage[HUGE_MAX_HSTATE];
};
#define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val))
#define MEMFILE_IDX(val) (((val) >> 16) & 0xffff)
#define MEMFILE_ATTR(val) ((val) & 0xffff)
struct cgroup_subsys hugetlb_subsys __read_mostly;
static struct hugetlb_cgroup *root_h_cgroup __read_mostly;
......@@ -257,6 +261,131 @@ void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
return;
}
static ssize_t hugetlb_cgroup_read(struct cgroup *cgroup, struct cftype *cft,
struct file *file, char __user *buf,
size_t nbytes, loff_t *ppos)
{
u64 val;
char str[64];
int idx, name, len;
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_cgroup(cgroup);
idx = MEMFILE_IDX(cft->private);
name = MEMFILE_ATTR(cft->private);
val = res_counter_read_u64(&h_cg->hugepage[idx], name);
len = scnprintf(str, sizeof(str), "%llu\n", (unsigned long long)val);
return simple_read_from_buffer(buf, nbytes, ppos, str, len);
}
static int hugetlb_cgroup_write(struct cgroup *cgroup, struct cftype *cft,
const char *buffer)
{
int idx, name, ret;
unsigned long long val;
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_cgroup(cgroup);
idx = MEMFILE_IDX(cft->private);
name = MEMFILE_ATTR(cft->private);
switch (name) {
case RES_LIMIT:
if (hugetlb_cgroup_is_root(h_cg)) {
/* Can't set limit on root */
ret = -EINVAL;
break;
}
/* This function does all necessary parse...reuse it */
ret = res_counter_memparse_write_strategy(buffer, &val);
if (ret)
break;
ret = res_counter_set_limit(&h_cg->hugepage[idx], val);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int hugetlb_cgroup_reset(struct cgroup *cgroup, unsigned int event)
{
int idx, name, ret = 0;
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_cgroup(cgroup);
idx = MEMFILE_IDX(event);
name = MEMFILE_ATTR(event);
switch (name) {
case RES_MAX_USAGE:
res_counter_reset_max(&h_cg->hugepage[idx]);
break;
case RES_FAILCNT:
res_counter_reset_failcnt(&h_cg->hugepage[idx]);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static char *mem_fmt(char *buf, int size, unsigned long hsize)
{
if (hsize >= (1UL << 30))
snprintf(buf, size, "%luGB", hsize >> 30);
else if (hsize >= (1UL << 20))
snprintf(buf, size, "%luMB", hsize >> 20);
else
snprintf(buf, size, "%luKB", hsize >> 10);
return buf;
}
int __init hugetlb_cgroup_file_init(int idx)
{
char buf[32];
struct cftype *cft;
struct hstate *h = &hstates[idx];
/* format the size */
mem_fmt(buf, 32, huge_page_size(h));
/* Add the limit file */
cft = &h->cgroup_files[0];
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.limit_in_bytes", buf);
cft->private = MEMFILE_PRIVATE(idx, RES_LIMIT);
cft->read = hugetlb_cgroup_read;
cft->write_string = hugetlb_cgroup_write;
/* Add the usage file */
cft = &h->cgroup_files[1];
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.usage_in_bytes", buf);
cft->private = MEMFILE_PRIVATE(idx, RES_USAGE);
cft->read = hugetlb_cgroup_read;
/* Add the MAX usage file */
cft = &h->cgroup_files[2];
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.max_usage_in_bytes", buf);
cft->private = MEMFILE_PRIVATE(idx, RES_MAX_USAGE);
cft->trigger = hugetlb_cgroup_reset;
cft->read = hugetlb_cgroup_read;
/* Add the failcntfile */
cft = &h->cgroup_files[3];
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.failcnt", buf);
cft->private = MEMFILE_PRIVATE(idx, RES_FAILCNT);
cft->trigger = hugetlb_cgroup_reset;
cft->read = hugetlb_cgroup_read;
/* NULL terminate the last cft */
cft = &h->cgroup_files[4];
memset(cft, 0, sizeof(*cft));
WARN_ON(cgroup_add_cftypes(&hugetlb_subsys, h->cgroup_files));
return 0;
}
struct cgroup_subsys hugetlb_subsys = {
.name = "hugetlb",
.create = hugetlb_cgroup_create,
......
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