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

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Message-ID: <Pine.LNX.4.64.0709031230190.2131@schroedinger.engr.sgi.com>
Date:	Mon, 3 Sep 2007 12:31:49 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Christoph Hellwig <hch@...radead.org>
cc:	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, 3 Sep 2007, Christoph Hellwig wrote:

> > 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.

So you'd be fine with replacing the allocs with

get_free_pages(GFP_xxx, get_order(size)) ?

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