linux-kernel - Re: [PATCH v2] mm: add access/dirty bit on numa page fault

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Message-ID: <YjPkf704nT/T9S9i@casper.infradead.org>
Date:   Fri, 18 Mar 2022 01:46:39 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     maobibo <maobibo@...ngson.cn>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Anshuman Khandual <anshuman.khandual@....com>
Subject: Re: [PATCH v2] mm: add access/dirty bit on numa page fault

On Fri, Mar 18, 2022 at 09:01:32AM +0800, maobibo wrote:
> > Is this a correctness problem, in which case this will need to be
> > backported, or is this a performance problem, in which case can you
> > share some numbers?
> It is only performance issue, and there is no obvious performance
> improvement for general workloads on my hand, but I do not test
> it on microbenchmark.

... if there's no performance improvement, why should we apply this
patch?  Confused.