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memcg: extract mem_group_usage() from mem_cgroup_read() 

Helper to get memory or mem+swap usage of the cgroup.

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: Dan Malek <dan@embeddedalley.com>
Cc: Vladislav Buzov <vbuzov@embeddedalley.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Alexander Shishkin <virtuoso@slind.org>
Cc: Davide Libenzi <davidel@xmailserver.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov 2010-03-10 15:22:21 -08:00 committed by Linus Torvalds
parent 0dea116876
commit 104f39284e
1 changed files with 32 additions and 22 deletions
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54
mm/memcontrol.c
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@ -2857,40 +2857,50 @@ mem_cgroup_get_recursive_idx_stat(struct mem_cgroup *mem,
*val = d.val;
}
static inline u64 mem_cgroup_usage(struct mem_cgroup *mem, bool swap)
{
u64 idx_val, val;
if (!mem_cgroup_is_root(mem)) {
if (!swap)
return res_counter_read_u64(&mem->res, RES_USAGE);
else
return res_counter_read_u64(&mem->memsw, RES_USAGE);
}
mem_cgroup_get_recursive_idx_stat(mem, MEM_CGROUP_STAT_CACHE, &idx_val);
val = idx_val;
mem_cgroup_get_recursive_idx_stat(mem, MEM_CGROUP_STAT_RSS, &idx_val);
val += idx_val;
if (swap) {
mem_cgroup_get_recursive_idx_stat(mem,
MEM_CGROUP_STAT_SWAPOUT, &idx_val);
val += idx_val;
}
return val << PAGE_SHIFT;
}
static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
{
struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
u64 idx_val, val;
u64 val;
int type, name;
type = MEMFILE_TYPE(cft->private);
name = MEMFILE_ATTR(cft->private);
switch (type) {
case _MEM:
if (name == RES_USAGE && mem_cgroup_is_root(mem)) {
mem_cgroup_get_recursive_idx_stat(mem,
MEM_CGROUP_STAT_CACHE, &idx_val);
val = idx_val;
mem_cgroup_get_recursive_idx_stat(mem,
MEM_CGROUP_STAT_RSS, &idx_val);
val += idx_val;
val <<= PAGE_SHIFT;
} else
if (name == RES_USAGE)
val = mem_cgroup_usage(mem, false);
else
val = res_counter_read_u64(&mem->res, name);
break;
case _MEMSWAP:
if (name == RES_USAGE && mem_cgroup_is_root(mem)) {
mem_cgroup_get_recursive_idx_stat(mem,
MEM_CGROUP_STAT_CACHE, &idx_val);
val = idx_val;
mem_cgroup_get_recursive_idx_stat(mem,
MEM_CGROUP_STAT_RSS, &idx_val);
val += idx_val;
mem_cgroup_get_recursive_idx_stat(mem,
MEM_CGROUP_STAT_SWAPOUT, &idx_val);
val += idx_val;
val <<= PAGE_SHIFT;
} else
if (name == RES_USAGE)
val = mem_cgroup_usage(mem, true);
else
val = res_counter_read_u64(&mem->memsw, name);
break;
default: