linux-kernel - Re: [15/17] SLUB: Support virtual fallback via SLAB

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Message-Id: <1191056021.18147.104.camel@lappy>
Date:	Sat, 29 Sep 2007 10:53:41 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Christoph Lameter <clameter@....com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Christoph Hellwig <hch@....de>, Mel Gorman <mel@...net.ie>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	David Chinner <dgc@....com>, Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [15/17] SLUB: Support virtual fallback via SLAB_VFALLBACK


On Sat, 2007-09-29 at 10:47 +0200, Peter Zijlstra wrote:

> Ah, right, that was the detail... all this lumpy reclaim is useless for
> atomic allocations. And with SLUB using higher order pages, atomic !0
> order allocations will be very very common.
> 
> One I can remember was:
> 
>   add_to_page_cache()
>     radix_tree_insert()
>       radix_tree_node_alloc()
>         kmem_cache_alloc()
> 
> which is an atomic callsite.
> 
> Which leaves us in a situation where we can load pages, because there is
> free memory, but can't manage to allocate memory to track them.. 

Ah, I found a boot log of one of these sessions, its also full of
order-2 OOMs.. :-/

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