linux-ext4 - Re: [PATCH] JBD slab cleanups

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Message-Id: <1190230126.6504.5.camel@norville.austin.ibm.com>
Date:	Wed, 19 Sep 2007 19:28:46 +0000
From:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
To:	cmm@...ibm.com
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Badari Pulavarty <pbadari@...ibm.com>,
	Christoph Lameter <clameter@....com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	ext4 development <linux-ext4@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] JBD slab cleanups

On Wed, 2007-09-19 at 14:26 -0500, Dave Kleikamp wrote:
> On Wed, 2007-09-19 at 12:15 -0700, Mingming Cao wrote:
> 
> > Here is the patch to clean up __GFP_NOFAIL flag in jbd/jbd2. In all
> > cases except one handles memory allocation failure so I get rid of those
> > GFP_NOFAIL flags.
> > 
> > Also, shouldn't we use GFP_KERNEL instead of GFP_NOFS flag for kmalloc
> > in jbd/jbd2? I will send a separate patch to cleanup that.
> 
> No.  GFP_NOFS avoids deadlock.  It prevents the allocation from making
> recursive calls back into the file system that could end up blocking on
> jbd code.

Oh, I see your patch now.  You mean use GFP_NOFS instead of
GFP_KERNEL.  :-)  OK then.

> Shaggy
-- 
David Kleikamp
IBM Linux Technology Center

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