Re: [Bug 117731] New: Doing mprotect for PROT_NONE and then for PROT_READ|PROT_WRITE reduces CPU write B/W on buffer

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On Fri, May 6, 2016 at 3:01 PM, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> (switched to email.  Please respond via emailed reply-to-all, not via the
> bugzilla web interface).
>
> Great bug report, thanks.
>
> I assume the breakage was caused by
>
> commit 64e455079e1bd7787cc47be30b7f601ce682a5f6
> Author:     Peter Feiner <pfeiner@xxxxxxxxxx>
> AuthorDate: Mon Oct 13 15:55:46 2014 -0700
> Commit:     Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
> CommitDate: Tue Oct 14 02:18:28 2014 +0200
>
>     mm: softdirty: enable write notifications on VMAs after VM_SOFTDIRTY cleared
>
>
> Could someone (Peter, Kirill?) please take a look?

Thanks for the report! I'm taking a look.

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