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Re: XFS memory allocation deadlock in 2.6.38

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: XFS memory allocation deadlock in 2.6.38
From: "'Christoph Hellwig'" <hch@xxxxxxxxxxxxx>
Date: Wed, 30 Mar 2011 05:23:17 -0400
Cc: "'Christoph Hellwig'" <hch@xxxxxxxxxxxxx>, Sean Noonan <Sean.Noonan@xxxxxxxxxxxx>, Trammell Hudson <Trammell.Hudson@xxxxxxxxxxxx>, Christos Zoulas <Christos.Zoulas@xxxxxxxxxxxx>, Martin Bligh <Martin.Bligh@xxxxxxxxxxxx>, "'linux-kernel@xxxxxxxxxxxxxxx'" <linux-kernel@xxxxxxxxxxxxxxx>, Stephen Degler <Stephen.Degler@xxxxxxxxxxxx>, "'linux-mm@xxxxxxxxx'" <linux-mm@xxxxxxxxx>, "'linux-xfs@xxxxxxxxxxx'" <linux-xfs@xxxxxxxxxxx>, "'Michel Lespinasse'" <walken@xxxxxxxxxx>
In-reply-to: <20110329224230.GH3008@dastard>
References: <20110324174311.GA31576@xxxxxxxxxxxxx> <AANLkTikwwRm6FHFtEdUg54NvmKdswQw-NPH5dtq1mXBK@xxxxxxxxxxxxxx> <081DDE43F61F3D43929A181B477DCA95639B5349@xxxxxxxxxxxxxxxxxxxx> <BANLkTin0jJevStg5P2hqsLbqMzo3o30sYg@xxxxxxxxxxxxxx> <081DDE43F61F3D43929A181B477DCA95639B534E@xxxxxxxxxxxxxxxxxxxx> <081DDE43F61F3D43929A181B477DCA95639B5359@xxxxxxxxxxxxxxxxxxxx> <20110329192434.GA10536@xxxxxxxxxxxxx> <081DDE43F61F3D43929A181B477DCA95639B535C@xxxxxxxxxxxxxxxxxxxx> <20110329200256.GA6019@xxxxxxxxxxxxx> <20110329224230.GH3008@dastard>
User-agent: Mutt/1.5.21 (2010-09-15)
On Wed, Mar 30, 2011 at 09:42:30AM +1100, Dave Chinner wrote:
> > +#define MAX_VMALLOCS       6
> > +#define MAX_SLAB_SIZE      0x20000
> 
> Why those values for the magic numbers?

Ask the person who added it originall, it's just a revert to the
code before my commit to clean up our vmalloc usage.

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