linux-kernel - Re: [PATCH v1 2/7] mm/ksm: simplify break_ksm() to not rely on VM_FAULT

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Message-ID: <Yz3pFPuJrWEIHCWz@x1n>
Date:   Wed, 5 Oct 2022 16:29:08 -0400
From:   Peter Xu <peterx@...hat.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>, Hugh Dickins <hughd@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Jason Gunthorpe <jgg@...dia.com>,
        John Hubbard <jhubbard@...dia.com>
Subject: Re: [PATCH v1 2/7] mm/ksm: simplify break_ksm() to not rely on
 VM_FAULT_WRITE

On Fri, Sep 30, 2022 at 04:19:26PM +0200, David Hildenbrand wrote:
> I don't think that we particularly care about that performance drop when
> unmerging. If it ever turns out to be an actual performance issue, we can
> think about a better alternative for FAULT_FLAG_UNSHARE -- let's just keep
> it simple for now.

It'll be nice to hear from real ksm users for sure.  But to me this makes
sense, and the patch itself looks good to me, I think that also means:

Acked-by: Peter Xu <peterx@...hat.com>

-- 
Peter Xu