linux-kernel - Re: [patch -mm v2] mm: introduce oom_adj

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Message-ID: <alpine.DEB.2.00.0908030107110.30778@chino.kir.corp.google.com>
Date:	Mon, 3 Aug 2009 01:08:42 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Paul Menage <menage@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch -mm v2] mm: introduce oom_adj_child

On Mon, 3 Aug 2009, KAMEZAWA Hiroyuki wrote:

> > You can't recalculate it if all the remaining threads have a different 
> > oom_adj value than the effective oom_adj value from the thread that is now 
> > exited.  
> 
> Then, crazy google apps pass different oom_adjs to each thread ?
> And, threads other than thread-group-leader modifies its oom_adj.
> 

Nope, but I'm afraid you've just made my point for me: it shows that 
oom_adj really isn't sanely used as a per-thread attribute and actually 
only represents a preference on oom killing a quantity of memory in all 
other cases other than vfork() -> change /proc/pid-of-child/oom_adj -> 
exec() for which we now appropriately have /proc/pid/oom_adj_child for.

Thanks.
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