linux-kernel - Re: [patch 06/12] mm: oom_kill: simplify OOM killer locking

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Date:	Wed, 25 Mar 2015 16:05:57 +0800
From:	"Hillf Danton" <hillf.zj@...baba-inc.com>
To:	"Johannes Weiner" <hannes@...xchg.org>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>, "Hillf Danton" <hillf.zj@...baba-inc.com>
Subject: Re: [patch 06/12] mm: oom_kill: simplify OOM killer locking


> --- 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

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