linux-kernel - Re: [PATCH 0/7] Kill PF

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Message-ID: <20091117101526.GA4797@infradead.org>
Date:	Tue, 17 Nov 2009 05:15:26 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	linux-mm <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 0/7] Kill PF_MEMALLOC abuse

On Tue, Nov 17, 2009 at 04:16:04PM +0900, KOSAKI Motohiro wrote:
> Some subsystem paid attention (1) only, and start to use PF_MEMALLOC abuse.
> But, the fact is, PF_MEMALLOC is the promise of "I have lots freeable memory.
> if I allocate few memory, I can return more much meory to the system!".
> Non MM subsystem must not use PF_MEMALLOC. Memory reclaim
> need few memory, anyone must not prevent it. Otherwise the system cause
> mysterious hang-up and/or OOM Killer invokation.

And that's exactly the promises xfsbufd gives.  It writes out dirty
metadata buffers and will free lots of memory if you kick it. 

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