| Date | Thu, 29 May 2014 08:11:18 +1000 | From | Dave Chinner <> | Subject | Re: [RFC 2/2] x86_64: expand kernel stack to 16K |
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On Wed, May 28, 2014 at 07:23:23AM -0700, H. Peter Anvin wrote: > We tried for 4K on x86-64, too, for b quite a while as I recall. > The kernel stack is a one of the main costs for a thread. I would > like to decouple struct thread_info from the kernel stack (PJ > Waskewicz was working on that before he left Intel) but that > doesn't buy us all that much. > > 8K additional per thread is a huge hit. XFS has indeed always > been a canary, or troublespot, I suspect because it originally > came from another kernel where this was not an optimization > target.
<sigh>
Always blame XFS for stack usage problems.
Even when the reported problem is from IO to an ext4 filesystem.
Cheers,
Dave. -- Dave Chinner david@fromorbit.com
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