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Re: XFS causing stack overflow

To: Andi Kleen <andi@xxxxxxxxxxxxxx>
Subject: Re: XFS causing stack overflow
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Sun, 11 Dec 2011 09:13:45 +1100
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, linux-mm@xxxxxxxxx, xfs@xxxxxxxxxxx, "Ryan C. England" <ryan.england@xxxxxxxxxxxxx>
In-reply-to: <m262hop5kc.fsf@xxxxxxxxxxxxxx>
References: <CAAnfqPAm559m-Bv8LkHARm7iBW5Kfs7NmjTFidmg-idhcOq4sQ@xxxxxxxxxxxxxx> <20111209115513.GA19994@xxxxxxxxxxxxx> <20111209221956.GE14273__25752.826271537$1323469420$gmane$org@dastard> <m262hop5kc.fsf@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Sat, Dec 10, 2011 at 11:52:51AM -0800, Andi Kleen wrote:
> Dave Chinner <david@xxxxxxxxxxxxx> writes:
> >
> > You forgot about interrupt stacking - that trace shows the system
> > took an interrupt at the point of highest stack usage in the
> > writeback call chain.... :/
> 
> The interrupts are always running on other stacks these days
> (even 32bit got switched over).

Where does the x86-64 do the interrupt stack switch?

I know the x86 32 bit interrupt handler switches to an irq/softirq
context stack, but the 64 bit one doesn't appear to. Indeed,
arch/x86/kernel/irq_{32,64}.c are very different, and only the 32
bit irq handler switches to another stack to process the
interrupts...

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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