linux-kernel - Re: [patch 1/4] mm: vmscan: remove remains of kswapd-managed zone->all

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Message-ID: <20140623125602.GL10819@suse.de>
Date:	Mon, 23 Jun 2014 13:56:02 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 1/4] mm: vmscan: remove remains of kswapd-managed
 zone->all_unreclaimable

On Fri, Jun 20, 2014 at 12:33:47PM -0400, Johannes Weiner wrote:
> shrink_zones() has a special branch to skip the all_unreclaimable()
> check during hibernation, because a frozen kswapd can't mark a zone
> unreclaimable.
> 
> But ever since 6e543d5780e3 ("mm: vmscan: fix do_try_to_free_pages()
> livelock"), determining a zone to be unreclaimable is done by directly
> looking at its scan history and no longer relies on kswapd setting the
> per-zone flag.
> 
> Remove this branch and let shrink_zones() check the reclaimability of
> the target zones regardless of hibernation state.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

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

-- 
Mel Gorman
SUSE Labs
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