Messages in this thread | | | Date | Mon, 23 Jul 2012 16:30:20 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH, RFC 0/6] Avoid cache trashing on clearing huge/gigantic page |
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On Fri, 20 Jul 2012 15:50:16 +0300 "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> wrote:
> Clearing a 2MB huge page will typically blow away several levels of CPU > caches. To avoid this only cache clear the 4K area around the fault > address and use a cache avoiding clears for the rest of the 2MB area. > > It would be nice to test the patchset with more workloads. Especially if > you see performance regression with THP. > > Any feedback is appreciated.
This all looks pretty sane to me. Some detail-poking from the x86 guys would be nice.
What do other architectures need to do? Simply implement clear_page_nocache()? I believe that powerpc is one, not sure about others. Please update the changelogs to let arch maintainers know what they should do and cc those people on future versions?
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