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Re: XFS causing stack overflow

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: XFS causing stack overflow
From: Andi Kleen <andi@xxxxxxxxxxxxxx>
Date: Sun, 11 Dec 2011 01:00:36 +0100
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, linux-mm@xxxxxxxxx, xfs@xxxxxxxxxxx, "Ryan C. England" <ryan.england@xxxxxxxxxxxxx>
In-reply-to: <20111210221345.GG14273@dastard>
References: <CAAnfqPAm559m-Bv8LkHARm7iBW5Kfs7NmjTFidmg-idhcOq4sQ@xxxxxxxxxxxxxx> <20111209115513.GA19994@xxxxxxxxxxxxx> <20111209221956.GE14273__25752.826271537$1323469420$gmane$org@dastard> <m262hop5kc.fsf@xxxxxxxxxxxxxx> <20111210221345.GG14273@dastard>
User-agent: Mutt/
> Where does the x86-64 do the interrupt stack switch?

in entry_64.S

> 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...

x86-64 always used interrupt stacks and has used softirq stacks
for a long time. 32bit got to it much later (the only good 
thing left from that 4k stack "experiment")


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