linux-kernel - Re: [PATCH 2/5] Revert "oom: give the dying task a higher priority"

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Message-Id: <20110328184856.F078.A69D9226@jp.fujitsu.com>
Date:	Mon, 28 Mar 2011 18:48:13 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>, linux-mm <linux-mm@...ck.org>,
	Andrey Vagin <avagin@...nvz.org>,
	Hugh Dickins <hughd@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"Luis Claudio R. Goncalves" <lclaudio@...g.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 2/5] Revert "oom: give the dying task a higher priority"

Hi

> @@ -434,9 +452,17 @@ static int oom_kill_task(struct task_struct *p)
>                 K(get_mm_counter(p->mm, MM_FILEPAGES)));
>         task_unlock(p);
>  
> -       p->rt.time_slice = HZ; <<---- THIS
> +
>         set_tsk_thread_flag(p, TIF_MEMDIE);
>         force_sig(SIGKILL, p);
> +
> +       /*
> +        * We give our sacrificial lamb high priority and access to
> +        * all the memory it needs. That way it should be able to
> +        * exit() and clear out its resources quickly...
> +        */
> +       boost_dying_task_prio(p, mem);
> +
>         return 0;
>  }
> 
> At that time, I thought that routine is meaningless in non-RT scheduler.
> So I Cced Peter but don't get the answer.
> I just want to confirm it.
> 
> Do you still think it's meaningless? 

In short, yes.


> so you remove it when you revert 93b43fa5508?
> Then, this isn't just revert patch but revert + killing meaningless code patch.

If you want, I'd like to rename a patch title. That said, we can't revert
93b43fa5508 simple cleanly, several patches depend on it. therefore I
reverted it manualy. and at that time, I don't want to resurrect
meaningless logic. anyway it's no matter. Luis is preparing new patches.
therefore we will get the same end result. :)



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