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

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Date:   Wed, 27 May 2020 15:41:48 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Mel Gorman <mgorman@...e.de>, Roman Gushchin <guro@...com>,
        Michal Hocko <mhocko@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Minchan Kim <minchan@...nel.org>,
        Rik van Riel <riel@...riel.com>, linux-mm@...ck.org,
        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 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.