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memcg: add interface to reset limits 

We don't have an interface to reset mem.limit or memsw.limit now.

This patch allows to reset mem.limit or memsw.limit when they are being
set to -1.

Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Dhaval Giani <dhaval@linux.vnet.ibm.com>
Cc: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Daisuke Nishimura 2009-06-17 16:27:20 -07:00 committed by Linus Torvalds
parent 22a668d7c3
commit c5b947b288
3 changed files with 14 additions and 1 deletions
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1
Documentation/cgroups/memory.txt
View File

@ -209,6 +209,7 @@ We can alter the memory limit:
NOTE: We can use a suffix (k, K, m, M, g or G) to indicate values in kilo,
mega or gigabytes.
NOTE: We can write "-1" to reset the *.limit_in_bytes(unlimited).
# cat /cgroups/0/memory.limit_in_bytes
4194304

2
include/linux/res_counter.h
View File

@ -49,6 +49,8 @@ struct res_counter {
struct res_counter *parent;
};
#define RESOURCE_MAX (unsigned long long)LLONG_MAX
/**
* Helpers to interact with userspace
* res_counter_read_u64() - returns the value of the specified member.

12
kernel/res_counter.c
View File

@ -18,7 +18,7 @@
void res_counter_init(struct res_counter *counter, struct res_counter *parent)
{
spin_lock_init(&counter->lock);
counter->limit = (unsigned long long)LLONG_MAX;
counter->limit = RESOURCE_MAX;
counter->parent = parent;
}
@ -133,6 +133,16 @@ int res_counter_memparse_write_strategy(const char *buf,
unsigned long long *res)
{
char *end;
/* return RESOURCE_MAX(unlimited) if "-1" is specified */
if (*buf == '-') {
*res = simple_strtoull(buf + 1, &end, 10);
if (*res != 1 || *end != '\0')
return -EINVAL;
*res = RESOURCE_MAX;
return 0;
}
/* FIXME - make memparse() take const char* args */
*res = memparse((char *)buf, &end);
if (*end != '\0')