From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Fri, 4 Jul 2008 18:12:04 +0900 From: KAMEZAWA Hiroyuki Subject: [PATCH 1/2] res_counter : check limit change Message-Id: <20080704181204.44070413.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: LKML Cc: "linux-mm@kvack.org" , Andrew Morton , "balbir@linux.vnet.ibm.com" , "xemul@openvz.org" , "menage@google.com" , "nishimura@mxp.nes.nec.co.jp" , "yamamoto@valinux.co.jp" 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 in it. Changelog: - fixed white space bug. Acked-by: Balbir Singh Signed-off-by: KAMEZAWA Hiroyuki include/linux/res_counter.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) Index: test-2.6.26-rc8-mm1/include/linux/res_counter.h =================================================================== --- test-2.6.26-rc8-mm1.orig/include/linux/res_counter.h +++ test-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