linux-kernel - Re: [PATCH resend 3/3] mm: fix LRU balancing effect of new transparent huge pages

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Message-ID: <CALvZod7Phd1H4vXXPOD_7u+1EU-52+3P-nV4eG+63_4_FuwYVA@mail.gmail.com>
Date:   Wed, 27 May 2020 14:35:47 -0700
From:   Shakeel Butt <shakeelb@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Johannes Weiner <hannes@...xchg.org>, Mel Gorman <mgorman@...e.de>,
        Roman Gushchin <guro@...com>, Michal Hocko <mhocko@...nel.org>,
        Minchan Kim <minchan@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        Linux MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH resend 3/3] mm: fix LRU balancing effect of new
 transparent huge pages

On Wed, May 27, 2020 at 1:46 PM Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> On Wed, 27 May 2020 15:41:48 -0400 Johannes Weiner <hannes@...xchg.org> wrote:
>
> > On Wed, May 27, 2020 at 11:29:58AM -0700, Shakeel Butt wrote:
> > > From: Johannes Weiner <hannes@...xchg.org>
> > >
> > > Currently, THP are counted as single pages until they are split right
> > > before being swapped out. However, at that point the VM is already in
> > > the middle of reclaim, and adjusting the LRU balance then is useless.
> > >
> > > Always account THP by the number of basepages, and remove the fixup
> > > from the splitting path.
> > >
> > > Signed-off-by: Johannes Weiner <hannes@...xchg.org>
> > > Signed-off-by: Shakeel Butt <shakeelb@...gle.com>
> >
> > This is now already in mm as part of the "mm: balance LRU lists based
> > on relative thrashing" series that I sent out last week and where it
> > was originally from.
>
> Yup.  I hope [1/3] and [2/3] weren't urgent?

No urgency.