linux-kernel - Re: [PATCH] x86/tlb: replace INVALIDATE_TLB_VECTOR by CALL_FUNCTION

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Message-ID: <4FBADAED.1010807@intel.com>
Date:	Tue, 22 May 2012 08:16:45 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Alex Shi <alex.shi@...el.com>
CC:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	seto.hidetoshi@...fujitsu.com, borislav.petkov@....com,
	tony.luck@...el.com, luto@....edu, jbeulich@...e.com,
	rostedt@...dmis.org, ak@...ux.intel.com, akpm@...ux-foundation.org,
	eric.dumazet@...il.com, akinobu.mita@...il.com,
	linux-kernel@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] x86/tlb: replace INVALIDATE_TLB_VECTOR by CALL_FUNCTION_VECTOR

On 05/19/2012 10:07 AM, Alex Shi wrote:

> On 05/18/2012 11:12 PM, Alex Shi wrote:
> 
>> There are only 32 INVALIDATE_TLB_VECTOR now in kernel.
>> but modern x86 sever has more cpu number. That causes lock
>> contention in TLB flushing.
>>
>> Now, useing generic smp call function to replace it.
>> In the NHM EX machine 4P * 8cores * HT = 64 CPUs, hackbench pthread
>> has 3% performance increase.
>> And no clear performance changes on NHM EP(16CPUs), WSM EP(23CPU)
>> and SNB EP(32CPU) machines.
>>
>> This patch is base on my tlb flush range support patchset.
>>
>> Signed-off-by: Alex Shi <alex.shi@...el.com>
> 
> 
> 
> refresh this patch will more clean up, and cc to PeterZ.
> Actually, I tried to keep flush_tlb_info into dedicated cache line, but did find clear help.


Correct: I did _not_ find clear help for dedicated cache line for
flush_tlb_info.

> 
> Comments are appreciated!
> 


Any comments for this patch?
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