Messages in this thread Patch in this message | | | Date | Mon, 14 Jul 2008 17:11:54 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | [PATCH 1/2][-mm][resend] res_counter limit change support ebusy |
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Add an interface to set limit. This is necessary to memory resource controller because it shrinks usage at set limit.
(*) Other controller may not need this interface to shrink usage because shrinking is not necessary or impossible.
This is an enhancement. named as res_counter-limit-change-ebusy.patch
Changelog: - fixed white space bug.
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>
include/linux/res_counter.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
Index: linux-2.6.26-rc8-mm1/include/linux/res_counter.h =================================================================== --- linux-2.6.26-rc8-mm1.orig/include/linux/res_counter.h +++ linux-2.6.26-rc8-mm1/include/linux/res_counter.h @@ -176,4 +176,19 @@ static inline bool res_counter_can_add(s return ret; } +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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