linux-kernel - Re: [PATCH] copy over oom

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Message-Id: <20090715104645.39A1.A69D9226@jp.fujitsu.com>
Date:	Wed, 15 Jul 2009 10:49:16 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	kosaki.motohiro@...fujitsu.com, Paul Menage <menage@...gle.com>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	rientjes@...gle.com, mel@....ul.ie, npiggin@...e.de
Subject: Re: [PATCH] copy over oom_adj value at fork time

> After moving the oom_adj value from the task struct to the
> mm_struct, the oom_adj value was no longer properly inherited
> by child processes.
> 
> Copying over the oom_adj value at fork time fixes that bug.
> 
> Signed-off-by: Rik van Riel <riel@...hat.com>
> Reported-by: Paul Menage <manage@...gle.com>
> ---
> Paul, does this fix your bug?
> 
>  kernel/fork.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> Index: mmotm/kernel/fork.c
> ===================================================================
> --- mmotm.orig/kernel/fork.c	2009-07-14 20:58:01.000000000 -0400
> +++ mmotm/kernel/fork.c	2009-07-14 21:00:40.000000000 -0400
> @@ -435,6 +435,7 @@ static struct mm_struct * mm_init(struct
>  	init_rwsem(&mm->mmap_sem);
>  	INIT_LIST_HEAD(&mm->mmlist);
>  	mm->flags = (current->mm) ? current->mm->flags : default_dump_filter;
> +	mm->oom_adj = current->mm->oom_adj;

Maybe, We need to check "(current->mm) != NULL" as mm->flags.



>  	mm->core_state = NULL;
>  	mm->nr_ptes = 0;
>  	set_mm_counter(mm, file_rss, 0);
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