Messages in this thread | | | Date | Mon, 26 Mar 2012 15:47:51 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [patch] x86, tlb: switch cr3 in leave_mm() only when needed |
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On 03/26/2012 03:47 PM, Suresh Siddha wrote: > On Fri, 2012-03-23 at 09:37 +0100, Ingo Molnar wrote: >> * Suresh Siddha <suresh.b.siddha@intel.com> wrote: >> >>> I was reviewing this code in some other context and thought >>> this optimization makes sense. Unless someone beats me, I can >>> collect some data on Monday. >> >> Would be really nice to get this data. >> > > On an idle system with 32logical cpu's (2 socket/8-core each) the > original kernel did the unnecessary load_cr3 2988 times during an > interval of 5 seconds. > > With the fix, that count drops to 9 times. >
Nice.
-hpa
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