linux-kernel - Re: [PATCH v5 6/7] x86/tlb: optimizing flush_tlb

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Message-ID: <4FB26312.6060105@intel.com>
Date:	Tue, 15 May 2012 22:07:14 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Nick Piggin <npiggin@...il.com>, yongjie.ren@...el.com
CC:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, arnd@...db.de,
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Subject: Re: [PATCH v5 6/7] x86/tlb: optimizing flush_tlb_mm

On 05/15/2012 05:17 PM, Nick Piggin wrote:

> On 15 May 2012 19:15, Nick Piggin <npiggin@...il.com> wrote:
>> So this should go to linux-arch...
>>
>> On 15 May 2012 18:55, Alex Shi <alex.shi@...el.com> wrote:
>>> Not every flush_tlb_mm execution moment is really need to evacuate all
>>> TLB entries, like in munmap, just few 'invlpg' is better for whole
>>> process performance, since it leaves most of TLB entries for later
>>> accessing.
> 
> Did you have microbenchmarks for this like your mprotect numbers,
> by the way? Test munmap numbers and see how that looks. Also,
> does it show up on any macro-benchmarks like specjbb?


Yongjie has tested the patchset and get some positive data on Virtual
machine.
Yongjie, could you like to share your data?
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