linux-kernel - Re: [PATCH 1/5] mm: vmscan: scan dirty pages even in laptop mode

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Message-ID: <20170126095225.kvv546uvofie25ym@suse.de>
Date:   Thu, 26 Jan 2017 09:52:25 +0000
From:   Mel Gorman <mgorman@...e.de>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH 1/5] mm: vmscan: scan dirty pages even in laptop mode

On Mon, Jan 23, 2017 at 01:16:37PM -0500, Johannes Weiner wrote:
> We have an elaborate dirty/writeback throttling mechanism inside the
> reclaim scanner, but for that to work the pages have to go through
> shrink_page_list() and get counted for what they are. Otherwise, we
> mess up the LRU order and don't match reclaim speed to writeback.
> 
> Especially during deactivation, there is never a reason to skip dirty
> pages; nothing is even trying to write them out from there. Don't mess
> up the LRU order for nothing, shuffle these pages along.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

Acked-by: Mel Gorman <mgorman@...e.de>

-- 
Mel Gorman
SUSE Labs