Commit 12b98044 authored Jul 25, 2008 by KAMEZAWA Hiroyuki Committed by Linus Torvalds Jul 25, 2008

res_counter: limit change support ebusy



Add an interface to set limit.  This is necessary to memory resource
controller because it shrinks usage at set limit.

Other controllers may not need this interface to shrink usage because
shrinking is not necessary or impossible.

Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent cede86ac

include/linux/res_counter.h

+16 −0

Original line number	Diff line number	Diff line
		@@ -158,4 +158,20 @@ static inline void res_counter_reset_failcnt(struct res_counter *cnt)
		cnt->failcnt = 0;
		spin_unlock_irqrestore(&cnt->lock, flags);
		}

		static inline int res_counter_set_limit(struct res_counter *cnt,
		unsigned long long limit)
		{
		unsigned long flags;
		int ret = -EBUSY;

		spin_lock_irqsave(&cnt->lock, flags);
		if (cnt->usage < limit) {
		cnt->limit = limit;
		ret = 0;
		}
		spin_unlock_irqrestore(&cnt->lock, flags);
		return ret;
		}

		#endif

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