From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 14 Jul 2008 17:11:54 +0900 From: KAMEZAWA Hiroyuki Subject: [PATCH 1/2][-mm][resend] res_counter limit change support ebusy Message-Id: <20080714171154.e1cc9943.kamezawa.hiroyu@jp.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Andrew Morton Cc: "linux-mm@kvack.org" , "balbir@linux.vnet.ibm.com" , "xemul@openvz.org" , LKML List-ID: 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 Acked-by: Pavel Emelyanov Signed-off-by: KAMEZAWA Hiroyuki 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org