Re: [PATCH v5 6/7] x86/tlb: optimizing flush_tlb_mm

From: Nick Piggin
Date: Tue May 15 2012 - 05:15:11 EST


So this should go to linux-arch...

On 15 May 2012 18:55, Alex Shi <alex.shi@xxxxxxxxx> 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.
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