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Re: x86: Is there still value in having a special tlb flush IPI vector?

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From: Nick Piggin <nickpiggin@...>
To: Ingo Molnar <mingo@...>
Cc: Peter Zijlstra <peterz@...>, Jeremy Fitzhardinge <jeremy@...>, Jens Axboe <jens.axboe@...>, Andi Kleen <ak@...>, Linux Kernel Mailing List <linux-kernel@...>, Thomas Gleixner <tglx@...>, H. Peter Anvin <hpa@...>
Subject: Re: x86: Is there still value in having a special tlb flush IPI vector?
Date: Thursday, July 31, 2008 - 9:32 pm

On Friday 01 August 2008 02:48, Ingo Molnar wrote:


smp_mb would cost some cycles. So would the branch mispredict because
list_empty would otherwise normally be taken I think. q likely is not
in cache either.

I'm not in favour.
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Messages in current thread:
x86: Is there still value in having a special tlb flush IPI ..., Jeremy Fitzhardinge, (Mon Jul 28, 7:16 pm)
Re: x86: Is there still value in having a special tlb flush ..., Ingo Molnar, (Mon Jul 28, 7:34 pm)
Re: x86: Is there still value in having a special tlb flush ..., Nick Piggin, (Tue Jul 29, 12:30 am)
Re: x86: Is there still value in having a special tlb flush ..., Peter Zijlstra, (Tue Jul 29, 5:54 am)
Re: x86: Is there still value in having a special tlb flush ..., Nick Piggin, (Tue Jul 29, 6:00 am)
Re: x86: Is there still value in having a special tlb flush ..., Peter Zijlstra, (Tue Jul 29, 6:45 am)
Re: x86: Is there still value in having a special tlb flush ..., Jeremy Fitzhardinge, (Thu Jul 31, 1:48 pm)
Re: x86: Is there still value in having a special tlb flush ..., Ingo Molnar, (Thu Jul 31, 4:57 pm)
Re: x86: Is there still value in having a special tlb flush ..., Peter Zijlstra, (Thu Jul 31, 5:15 pm)
Re: x86: Is there still value in having a special tlb flush ..., Ingo Molnar, (Thu Jul 31, 12:48 pm)
Re: x86: Is there still value in having a special tlb flush ..., Nick Piggin, (Thu Jul 31, 9:32 pm)
Re: x86: Is there still value in having a special tlb flush ..., Peter Zijlstra, (Tue Jul 29, 6:04 am)
Re: x86: Is there still value in having a special tlb flush ..., Nick Piggin, (Tue Jul 29, 6:17 am)
Re: x86: Is there still value in having a special tlb flush ..., Peter Zijlstra, (Tue Jul 29, 6:23 am)
Re: x86: Is there still value in having a special tlb flush ..., Jeremy Fitzhardinge, (Tue Jul 29, 2:19 am)
Re: x86: Is there still value in having a special tlb flush ..., Nick Piggin, (Tue Jul 29, 5:47 am)
Re: x86: Is there still value in having a special tlb flush ..., Jeremy Fitzhardinge, (Mon Jul 28, 7:20 pm)
Re: x86: Is there still value in having a special tlb flush ..., Andi Kleen, (Mon Jul 28, 10:12 pm)
Re: x86: Is there still value in having a special tlb flush ..., Jeremy Fitzhardinge, (Tue Jul 29, 2:29 am)
Re: x86: Is there still value in having a special tlb flush ..., Andi Kleen, (Tue Jul 29, 8:02 am)
Re: x86: Is there still value in having a special tlb flush ..., Jeremy Fitzhardinge, (Tue Jul 29, 10:46 am)
Re: x86: Is there still value in having a special tlb flush ..., Andi Kleen, (Tue Jul 29, 10:58 am)