Re: [PATCH 0 of 8] x86/smp function calls: convert x86 tlb flushes to use function calls

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To: Jeremy Fitzhardinge <jeremy@...>

Cc: Andi Kleen <andi@...>, Ingo Molnar <mingo@...>, LKML <linux-kernel@...>, <x86@...>, Nick Piggin <nickpiggin@...>, Jens Axboe <jens.axboe@...>

Subject: Re: [PATCH 0 of 8] x86/smp function calls: convert x86 tlb flushes to use function calls

Date: Tuesday, August 5, 2008 - 11:37 pm

On Tue, Aug 05, 2008 at 08:33:24PM -0700, Jeremy Fitzhardinge wrote:
quoted text> Andi Kleen wrote:
> >Jeremy Fitzhardinge <jeremy@goop.org> writes:
> >
> >  
> >>1. use smp_call_function_mask to implement cross-cpu TLB flushes
> >>    
> >
> >
> >Do you have any measurements comparing performance of the old and 
> >the new call? TLB flush is quite time critical so we should be very
> >careful here.
> 
> No.  What benchmark would you suggest?

Micro benchmark. Just stick RDTSC around the calls and trigger
a few remote flushes by e.g. doing mmap/munmap on a multithreaded program
running on different CPUs.

-Andi
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Messages in current thread:

[PATCH 0 of 8] x86/smp function calls: convert x86 tlb flush..., Jeremy Fitzhardinge, (Fri Aug 1, 8:14 pm)

Re: [PATCH 0 of 8] x86/smp function calls: convert x86 tlb f..., Andi Kleen, (Tue Aug 5, 11:22 pm)

Re: [PATCH 0 of 8] x86/smp function calls: convert x86 tlb f..., Jeremy Fitzhardinge, (Tue Aug 5, 11:33 pm)

Re: [PATCH 0 of 8] x86/smp function calls: convert x86 tlb f..., Andi Kleen, (Tue Aug 5, 11:37 pm)

Re: [PATCH 0 of 8] x86/smp function calls: convert x86 tlb f..., Jeremy Fitzhardinge, (Mon Aug 11, 7:57 pm)

[PATCH 4 of 8] x86: unify tlb.c, Jeremy Fitzhardinge, (Fri Aug 1, 8:14 pm)

[PATCH 5 of 8] smp_function_call: add multiple queues for sc..., Jeremy Fitzhardinge, (Fri Aug 1, 8:14 pm)

[PATCH 3 of 8] x86: make tlb_32|64 closer, Jeremy Fitzhardinge, (Fri Aug 1, 8:14 pm)

[PATCH 1 of 8] x86-32: use smp_call_function_mask for SMP TL..., Jeremy Fitzhardinge, (Fri Aug 1, 8:14 pm)

[PATCH 6 of 8] x86: add multiple smp_call_function queues, Jeremy Fitzhardinge, (Fri Aug 1, 8:14 pm)

[PATCH 7 of 8] x86: make number of smp_call_function queues ..., Jeremy Fitzhardinge, (Fri Aug 1, 8:14 pm)

[PATCH 8 of 8] smp function calls: add kernel parameter to d..., Jeremy Fitzhardinge, (Fri Aug 1, 8:14 pm)

[PATCH 2 of 8] x86-64: use smp_call_function_mask for SMP TL..., Jeremy Fitzhardinge, (Fri Aug 1, 8:14 pm)


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Re: [PATCH 0 of 8] x86/smp function calls: convert x86 tlb flushes to use function calls

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