Messages in this thread | | | Date | Wed, 27 Aug 2014 17:03:35 +0100 | From | Mel Gorman <> | Subject | Re: [PATCH 0/3] Reduce length of the eagerfpu path during x86 context switches |
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On Wed, Aug 06, 2014 at 01:55:45PM +0100, Mel Gorman wrote: > Eager FPU switching is used on CPUs that support xsave on the grounds > that CPUs that support it can optimise the switch with xsaveopt and xrstor > instead of serialising by updating cr0.TS which has serialising semantics. > > The path for eagerfpu is fatter than it needs to be because it still > maintains the fpu_counter for lazy FPU switches even though the information > is never used. This patch splits the paths optimises the eagerfpu path a > little. The benefit is marginal, it was just noticed when looking at why > integer-only workloads were spending time saving/restoring FPU states. >
This was initially sent when it would collide with the merge window which was stupid timing. Nothing has actually changed since but I wonder if anyone had a chance to take a look at this patches?
Thanks
-- Mel Gorman SUSE Labs
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