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

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Message-ID: <4FB26FBC.7040209@intel.com>
Date:	Tue, 15 May 2012 23:01:16 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Nick Piggin <npiggin@...il.com>, tglx@...utronix.de,
	mingo@...hat.com, hpa@...or.com, arnd@...db.de,
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	dhowells@...hat.com, fenghua.yu@...el.com, borislav.petkov@....com,
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	kamezawa.hiroyu@...fujitsu.com, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org, yongjie.ren@...el.com,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH v5 6/7] x86/tlb: optimizing flush_tlb_mm

On 05/15/2012 10:57 PM, Peter Zijlstra wrote:

> On Tue, 2012-05-15 at 16:36 +0200, Peter Zijlstra wrote:
>> On Tue, 2012-05-15 at 21:24 +0800, Alex Shi wrote:
>>
>>> Sorry. I don't understand what's the comments Peter's made days ago. I should ask for more details originally. 
>>>
>>> So, Peter, the correct change should like following, am I right?
>>>
>>> -#define tlb_flush(tlb) flush_tlb_mm((tlb)->mm)
>>> +#define tlb_flush(tlb, start, end) __flush_tlb_range((tlb)->mm, start, end)
>>
>> No.. the correct change is to do range tracking like the other archs
>> that support flush_tlb_range() do.
>>
>> You do not modify the tlb interface.
>>
>> Again, see: http://marc.info/?l=linux-arch&m=129952026504268&w=2


this code is for multiple architecture, but x86 still need implement
'flush tlb range' with 'invlpg'.

> 
> Just to be _very_ clear, you do not modify:
> 
>  mm/memory.c                     |    9 ++--
>  kernel/fork.c                   |    2 +-   
>  fs/proc/task_mmu.c              |    2 +-
> 


Thanks a lot. I see.

> As it stands your patch breaks compilation on a whole bunch of
> architectures.
> 
> If you touch the TLB interface, you get to touch _ALL_ architectures.


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