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Re: XFS causing stack overflow

To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: Re: XFS causing stack overflow
From: Andi Kleen <andi@xxxxxxxxxxxxxx>
Date: Fri, 09 Dec 2011 11:53:36 -0800
Cc: "Ryan C. England" <ryan.england@xxxxxxxxxxxxx>, linux-mm@xxxxxxxxx, xfs@xxxxxxxxxxx
In-reply-to: <20111209115513.GA19994__23079.9863501035$1323435203$gmane$org@xxxxxxxxxxxxx> (Christoph Hellwig's message of "Fri, 9 Dec 2011 06:55:13 -0500")
References: <CAAnfqPAm559m-Bv8LkHARm7iBW5Kfs7NmjTFidmg-idhcOq4sQ@xxxxxxxxxxxxxx> <20111209115513.GA19994__23079.9863501035$1323435203$gmane$org@xxxxxxxxxxxxx>
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.3 (gnu/linux)
Christoph Hellwig <hch@xxxxxxxxxxxxx> writes:
>
> You probably have only a third of the stack actually used by XFS, the
> rest is from NFSD/writeback code and page reclaim.  I don't think any
> of this is easily fixable in a 2.6.32 codebase.  Current mainline 3.2-rc
> now has the I/O-less balance dirty pages which will basically split the
> stack footprint in half, but it's an invasive change to the writeback
> code that isn't easily backportable.

An easy fix would be 16k stacks. Don't think they're that difficult
to do, but would need a special binary.

-Andi

-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only

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