From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f172.google.com (mail-pd0-f172.google.com [209.85.192.172]) by kanga.kvack.org (Postfix) with ESMTP id 11CF16B0038 for ; Wed, 25 Mar 2015 04:07:37 -0400 (EDT) Received: by pdbop1 with SMTP id op1so20708542pdb.2 for ; Wed, 25 Mar 2015 01:07:36 -0700 (PDT) Received: from us-alimail-mta1.hst.scl.en.alidc.net (mail113-248.mail.alibaba.com. [205.204.113.248]) by mx.google.com with ESMTP id vy7si2529445pac.53.2015.03.25.01.07.34 for ; Wed, 25 Mar 2015 01:07:36 -0700 (PDT) Reply-To: "Hillf Danton" From: "Hillf Danton" References: <048301d066d1$653e63d0$2fbb2b70$@alibaba-inc.com> In-Reply-To: <048301d066d1$653e63d0$2fbb2b70$@alibaba-inc.com> Subject: Re: [patch 06/12] mm: oom_kill: simplify OOM killer locking Date: Wed, 25 Mar 2015 16:05:57 +0800 Message-ID: <048701d066d2$86b182d0$94148870$@alibaba-inc.com> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Content-Language: zh-cn Sender: owner-linux-mm@kvack.org List-ID: To: Johannes Weiner Cc: linux-kernel , linux-mm@kvack.org, Hillf Danton > --- a/include/linux/oom.h > +++ b/include/linux/oom.h > @@ -32,6 +32,8 @@ enum oom_scan_t { > /* Thread is the potential origin of an oom condition; kill first on oom */ > #define OOM_FLAG_ORIGIN ((__force oom_flags_t)0x1) > > +extern struct mutex oom_lock; > + > static inline void set_current_oom_origin(void) > { > current->signal->oom_flags |= OOM_FLAG_ORIGIN; > @@ -60,9 +62,6 @@ extern void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order, > struct mem_cgroup *memcg, nodemask_t *nodemask, > const char *message); > > -extern bool oom_zonelist_trylock(struct zonelist *zonelist, gfp_t gfp_flags); > -extern void oom_zonelist_unlock(struct zonelist *zonelist, gfp_t gfp_flags); Alternately expose three functions, rather than oom_lock mutex? bool oom_trylock(void); void oom_lock(void); void oom_unlock(void); Hillf -- 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