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SubjectRe: [patch 1/2] fs: mnt_want_write speedup
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On Thu, 2009-04-02 at 20:22 +0200, Nick Piggin wrote:
> On Wed, Mar 18, 2009 at 12:13:43PM -0700, Dave Hansen wrote:
> > On Thu, 2009-03-12 at 05:13 +0100, Nick Piggin wrote:
> > > On Wed, Mar 11, 2009 at 03:11:17PM -0700, Dave Hansen wrote:
> > > > I'm feeling a bit better about these, although I am still honestly quite
> > > > afraid of the barriers. I also didn't like all the #ifdefs much, but
> > > > here's some help on that.
> > >
> > > FWIW, we have this in suse kernels because page fault performance was
> > > so bad compared with SLES10. mnt_want_write & co was I think the 2nd
> > > biggest offender for file backed mappings (after pvops). I think we're
> > > around parity again even with pvops.
> >
> > Page faults themselves? Which path was that from?
>
> Yes. file_update_time.

We should be able to use your mnt_clone_write() optimization separate
from the mnt_want_write() speedup here, right?

-- Dave



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