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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2009-10-01 15:44:11 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-10-01 16:11:13 -0700
commit4e649152cbaa1aedd01821d200ab9d597fe469e4 (patch)
tree635fa7d75acda929e81b8b0db7e641b7d4e07b35 /include
parent3dece8347df6a16239fab10dadb370854f1c969c (diff)
downloadlinaro-lsk-4e649152cbaa1aedd01821d200ab9d597fe469e4.tar.gz
memcg: some modification to softlimit under hierarchical memory reclaim.
This patch clean up/fixes for memcg's uncharge soft limit path. Problems: Now, res_counter_charge()/uncharge() handles softlimit information at charge/uncharge and softlimit-check is done when event counter per memcg goes over limit. Now, event counter per memcg is updated only when memory usage is over soft limit. Here, considering hierarchical memcg management, ancesotors should be taken care of. Now, ancerstors(hierarchy) are handled in charge() but not in uncharge(). This is not good. Prolems: 1. memcg's event counter incremented only when softlimit hits. That's bad. It makes event counter hard to be reused for other purpose. 2. At uncharge, only the lowest level rescounter is handled. This is bug. Because ancesotor's event counter is not incremented, children should take care of them. 3. res_counter_uncharge()'s 3rd argument is NULL in most case. ops under res_counter->lock should be small. No "if" sentense is better. Fixes: * Removed soft_limit_xx poitner and checks in charge and uncharge. Do-check-only-when-necessary scheme works enough well without them. * make event-counter of memcg incremented at every charge/uncharge. (per-cpu area will be accessed soon anyway) * All ancestors are checked at soft-limit-check. This is necessary because ancesotor's event counter may never be modified. Then, they should be checked at the same time. Reviewed-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Paul Menage <menage@google.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Balbir Singh <balbir@in.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/res_counter.h6
1 files changed, 2 insertions, 4 deletions
diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
index 731af71cddc..fcb9884df61 100644
--- a/include/linux/res_counter.h
+++ b/include/linux/res_counter.h
@@ -114,8 +114,7 @@ void res_counter_init(struct res_counter *counter, struct res_counter *parent);
int __must_check res_counter_charge_locked(struct res_counter *counter,
unsigned long val);
int __must_check res_counter_charge(struct res_counter *counter,
- unsigned long val, struct res_counter **limit_fail_at,
- struct res_counter **soft_limit_at);
+ unsigned long val, struct res_counter **limit_fail_at);
/*
* uncharge - tell that some portion of the resource is released
@@ -128,8 +127,7 @@ int __must_check res_counter_charge(struct res_counter *counter,
*/
void res_counter_uncharge_locked(struct res_counter *counter, unsigned long val);
-void res_counter_uncharge(struct res_counter *counter, unsigned long val,
- bool *was_soft_limit_excess);
+void res_counter_uncharge(struct res_counter *counter, unsigned long val);
static inline bool res_counter_limit_check_locked(struct res_counter *cnt)
{