linux-kernel - Re: [resend][PATCH 2/4] Revert "oom: deprecate oom

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Date:	Tue, 30 Nov 2010 12:07:39 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [resend][PATCH 2/4] Revert "oom: deprecate oom_adj tunable"

On Tue, 30 Nov 2010, KOSAKI Motohiro wrote:

> > Because NOTHING breaks with the new mapping.  Eight months later since 
> > this was initially proposed on linux-mm, you still cannot show a single 
> > example that depended on the exponential mapping of oom_adj.  I'm not 
> > going to continue responding to your criticism about this point since your 
> > argument is completely and utterly baseless.
> 
> No regression mean no break. Not single nor multiple. see?
> 

Nothing breaks.  If something did, you could respond to my answer above 
and provide a single example of a real-world example that broke as a 
result of the new linear mapping.

> All situation can be calculated on userland. User process can be know
> their bindings.
> 

Yes, but the proportional priority-based oom_score_adj values allow users 
to avoid recalculating and writing that value anytime a mempolicy 
attachment changes, its nodemask changes, it moves to another cpuset, its 
set of mems changes, its memcg attachment changes, its limit is modiifed, 
etc.
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