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Date: Fri, 4 Jul 2008 18:12:04 +0900 From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> To: LKML <linux-kernel@...r.kernel.org> Cc: "linux-mm@...ck.org" <linux-mm@...ck.org>, Andrew Morton <akpm@...ux-foundation.org>, "balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>, "xemul@...nvz.org" <xemul@...nvz.org>, "menage@...gle.com" <menage@...gle.com>, "nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>, "yamamoto@...inux.co.jp" <yamamoto@...inux.co.jp> Subject: [PATCH 1/2] res_counter : check limit change 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 <balbir@...ux.vnet.ibm.com> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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