netdev - Re: [PATCH 12/30] mm: memory reserve management

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Message-Id: <1217265226.18049.24.camel@twins>
Date:	Mon, 28 Jul 2008 19:13:46 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	netdev@...r.kernel.org, trond.myklebust@....uio.no,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Neil Brown <neilb@...e.de>, cl@...ux-foundation.org
Subject: Re: [PATCH 12/30] mm: memory reserve management

On Mon, 2008-07-28 at 11:59 -0500, Matt Mackall wrote:
> On Mon, 2008-07-28 at 12:39 +0200, Peter Zijlstra wrote:
> > Also, you might have noticed, I still need to do everything SLOB. The
> > last time I rewrote all this code I was still hoping Linux would 'soon'
> > have a single slab allocator, but evidently we're still going with 3 for
> > now.. :-/
> >
> > So I guess I can no longer hide behind that and will have to bite the
> > bullet and write the SLOB bits..
> 
> I haven't seen the rest of this thread, but I presume this is part of
> your OOM-avoidance for network I/O framework?

Yes indeed.

> SLOB can be pretty easily expanded to handle a notion of independent
> allocation arenas as there are only a couple global variables to switch
> between. kfree will also return allocations to the page list (and
> therefore arena) from whence they came. That may make it pretty simple
> to create and prepopulate reserve pools.

Right - currently we let all the reserves sit on the free page list. The
advantage there is that it also helps the anti-frag stuff, due to having
larger free lists.

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