linux-ext4 - Re: [RFC 1/2] JBD: slab management support for large block(>8k)

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Message-ID: <20070903134043.GB28962@infradead.org>
Date:	Mon, 3 Sep 2007 14:40:43 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Mingming Cao <cmm@...ibm.com>, linux-fsdevel@...r.kernel.org,
	adilger@...sterfs.com, sho@...s.nec.co.jp,
	ext4 development <linux-ext4@...r.kernel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 1/2] JBD: slab management support for large block(>8k)

On Mon, Sep 03, 2007 at 12:55:04AM -0700, Christoph Lameter wrote:
> On Sun, 2 Sep 2007, Christoph Hellwig wrote:
> 
> > > We are doing what you describe right now. So the current code is broken?
> > Yes.
> 
> How about getting rid of the slabs there and use kmalloc? Kmalloc in mm 
> (and therfore hopefully 2.6.24) will convert kmallocs > PAGE_SIZE to page 
> allocator calls. Not sure what to do about the 1k and 2k requests though.

The problem is that we must never use kmalloc pages, so we always need
to request a page or more for these.  Better to use get_free_page directly,
that's how I fixed it in XFS a while ago.
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