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Date:   Mon, 11 May 2020 14:11:22 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Shakeel Butt <shakeelb@google.com>
Cc:     Mel Gorman <mgorman@suse.de>, Johannes Weiner <hannes@cmpxchg.org>,
        Roman Gushchin <guro@fb.com>, Michal Hocko <mhocko@kernel.org>,
        Minchan Kim <minchan@kernel.org>,
        Rik van Riel <riel@surriel.com>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm: fix LRU balancing effect of new transparent huge
 pages
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On Sat,  9 May 2020 07:19:46 -0700 Shakeel Butt <shakeelb@google.com> wrote:

> 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.

Confused.  What kernel is this applicable to?