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List:       android-virt
Subject:    Re: [PATCH 2/4] mm: speed up mremap by 500x on large regions (v2)
From:       Will Deacon <will.deacon () arm ! com>
Date:       2018-10-29 10:28:40
Message-ID: 20181029102840.GC13965 () arm ! com
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On Fri, Oct 26, 2018 at 02:11:48PM -0700, Joel Fernandes wrote:
> My thinking is to take it slow and get the patch in in its current state,
> since it improves x86. Then as a next step, look into why the arm64 tlb
> flushes are that expensive and look into optimizing that. On arm64 I am
> testing on a 4.9 kernel so I'm wondering there are any optimizations since
> 4.9 that can help speed it up there. After that, if all else fails about
> speeding up arm64, then I look into developing the cleanest possible solution
> where we can keep the lock held for longer and flush lesser.

We rewrote a good chunk of the arm64 TLB invalidation and core mmu_gather
code this merge window, so please do have another look at -rc1!

Will
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