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authorBalbir Singh <balbir@linux.vnet.ibm.com>2009-09-23 15:56:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-24 07:20:59 -0700
commit296c81d89f4f14269f7346f81442910158c0a83a (patch)
treecf0e1facd1fed8282c1885bc4126e7bca1928712 /kernel/res_counter.c
parenta6df63615b943dbef22df04c19f4506330fe835e (diff)
downloadop-kernel-dev-296c81d89f4f14269f7346f81442910158c0a83a.zip
op-kernel-dev-296c81d89f4f14269f7346f81442910158c0a83a.tar.gz
memory controller: soft limit interface
Add an interface to allow get/set of soft limits. Soft limits for memory plus swap controller (memsw) is currently not supported. Resource counters have been enhanced to support soft limits and new type RES_SOFT_LIMIT has been added. Unlike hard limits, soft limits can be directly set and do not need any reclaim or checks before setting them to a newer value. Kamezawa-San raised a question as to whether soft limit should belong to res_counter. Since all resources understand the basic concepts of hard and soft limits, it is justified to add soft limits here. Soft limits are a generic resource usage feature, even file system quotas support soft limits. Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/res_counter.c')
-rw-r--r--kernel/res_counter.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/res_counter.c b/kernel/res_counter.c
index e1338f0..bcdabf3 100644
--- a/kernel/res_counter.c
+++ b/kernel/res_counter.c
@@ -19,6 +19,7 @@ void res_counter_init(struct res_counter *counter, struct res_counter *parent)
{
spin_lock_init(&counter->lock);
counter->limit = RESOURCE_MAX;
+ counter->soft_limit = RESOURCE_MAX;
counter->parent = parent;
}
@@ -101,6 +102,8 @@ res_counter_member(struct res_counter *counter, int member)
return &counter->limit;
case RES_FAILCNT:
return &counter->failcnt;
+ case RES_SOFT_LIMIT:
+ return &counter->soft_limit;
};
BUG();
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