linux-kernel - Re: [PATCH 04/10] mm: fix LRU balancing effect of new transparent huge pages

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Message-ID: <20160608072823.GD28155@bbox>
Date:	Wed, 8 Jun 2016 16:28:23 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Johannes Weiner <hannes@...xchg.org>
CC:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Michal Hocko <mhocko@...e.cz>,
	Tim Chen <tim.c.chen@...ux.intel.com>, <kernel-team@...com>
Subject: Re: [PATCH 04/10] mm: fix LRU balancing effect of new transparent
 huge pages

On Mon, Jun 06, 2016 at 03:48:30PM -0400, Johannes Weiner 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.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>
Acked-by: Minchan Kim <minchan@...nel.org>