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

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Date:	Tue, 15 May 2012 21:24:28 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Nick Piggin <npiggin@...il.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 05:15 PM, Nick Piggin 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.
>>
>> This patch is changing flush_tlb_mm(mm) to flush_tlb_mm(mm, start, end)
>> in cases.
> 
> What happened with Peter's comment about using flush_tlb_range for this?
> 
> flush_tlb_mm() API should just stay unchanged AFAIKS.
> 
> Then you need to work out the best way to give range info to the tlb/mmu gather
> API. Possibly passing in the rage for that guy is OK, which x86 can
> then implement
> as flush range.


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)

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