Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [PATCH 10/17] 2.6.17.1 perfmon2 patch for review: PMU context switch | Date | Mon, 3 Jul 2006 21:36:28 +0200 |
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On Monday 03 July 2006 21:22, Stephane Eranian wrote: > Andi, > > On Mon, Jul 03, 2006 at 09:25:48PM +0200, Andi Kleen wrote: > > On Monday 03 July 2006 11:49, Stephane Eranian wrote: > > > Andi, > > > > > > Here is a first cut at the patch to simplify the context > > > switch for the common case and also touch 2 cachelines (instead of 3). > > > There are 2 new TIF flags. I just tried this on x86_64 but I believe > > > we could do the same on i386. > > > > > > Is that what you were thinking about? > > > > Yes, looks good. > > > I have worked on this some more and I also looked at i386. > They seem to handle the io bitmap differently there. At least > they seem to have some lazy scheme whereby you do not reinstall > if new task is the last owner of tss. Is there a reason for not > having this in place for x86-64?
There was a reason but I can't remember it right now :/ Something in the new scheme didn't fit well or it was just too complicated.
-Andi
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