linux-kernel - Re: [RFC] [PATCH] Cgroup based OOM killer controller

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Message-ID: <20090122232532.GA5656@ioremap.net>
Date:	Fri, 23 Jan 2009 02:25:32 +0300
From:	Evgeniy Polyakov <zbr@...emap.net>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Nikanth Karthikesan <knikanth@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Chris Snook <csnook@...hat.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Paul Menage <menage@...gle.com>,
	containers@...ts.linux-foundation.org
Subject: Re: [RFC] [PATCH] Cgroup based OOM killer controller

On Fri, Jan 23, 2009 at 01:53:04AM +0300, Evgeniy Polyakov (zbr@...emap.net) wrote:
> > I'm quite certain you've spent more time writing emails to me than merging 
> > the patch and testing its possibilities, given your lack of understanding 
> > of its very basic concepts.
> 
> How cute :)
> Any other technical arguments of the same strength?

Its my turn now for the professional statements, let's start with this
technical side: you wanted to send a signal for the process to be killed,
but this will need
1. to allocate a signal, which will deadlock
2. no need to do this for sigill, but it will not work if process is in
unkillable state, while oom-killer clears iirc

Now to the oom-handler: if it will want to free some memory, it will
have to call a syscall with some pointer, which in turn may be in the
swapped area, so handler will be locked.

-- 
	Evgeniy Polyakov
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