linux-kernel - Re: [RFC 0/7] Postphone reclaim laundry to write at high water marks

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Message-ID: <20070823120819.GO13915@v2.random>
Date:	Thu, 23 Aug 2007 14:08:28 +0200
From:	Andrea Arcangeli <andrea@...e.de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Christoph Lameter <clameter@....com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 0/7] Postphone reclaim laundry to write at high water
	marks

On Wed, Aug 22, 2007 at 12:09:03AM +0200, Peter Zijlstra wrote:
> Strictly speaking:
> 
> if:
> 
>  page = alloc_page(gfp);
> 
> fails but:
> 
>  obj = kmem_cache_alloc(s, gfp);
> 
> succeeds then its a bug.

Why? this is like saying that if alloc_pages(order=1) fails but
alloc_pages(order=0) succeeds then it's a bug. Obviously it's not a
bug.

The only bug is if slab allocations <=4k fails despite
alloc_pages(order=0) would succeed.
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