linux-kernel - Re: [patch 02/11] mm: vmscan: distinguish global reclaim from global LRU scanning

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Message-ID: <20110920085219.GB11489@redhat.com>
Date:	Tue, 20 Sep 2011 10:52:19 +0200
From:	Johannes Weiner <jweiner@...hat.com>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Balbir Singh <bsingharora@...il.com>,
	Ying Han <yinghan@...gle.com>,
	Greg Thelen <gthelen@...gle.com>,
	Michel Lespinasse <walken@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Christoph Hellwig <hch@...radead.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 02/11] mm: vmscan: distinguish global reclaim from global
 LRU scanning

On Mon, Sep 19, 2011 at 03:23:44PM +0200, Michal Hocko wrote:
> On Mon 12-09-11 12:57:19, Johannes Weiner wrote:
> > The traditional zone reclaim code is scanning the per-zone LRU lists
> > during direct reclaim and kswapd, and the per-zone per-memory cgroup
> > LRU lists when reclaiming on behalf of a memory cgroup limit.
> > 
> > Subsequent patches will convert the traditional reclaim code to
> > reclaim exclusively from the per-memory cgroup LRU lists.  As a
> > result, using the predicate for which LRU list is scanned will no
> > longer be appropriate to tell global reclaim from limit reclaim.
> > 
> > This patch adds a global_reclaim() predicate to tell direct/kswapd
> > reclaim from memory cgroup limit reclaim and substitutes it in all
> > places where currently scanning_global_lru() is used for that.
> 
> I am wondering about vmscan_swappiness. Shouldn't it use global_reclaim
> instead?

Thanks for noticing, you are right.  Too many rebases...

Signed-off-by: Johannes Weiner <jweiner@...hat.com>
---

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 354f125..c2b0903 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1840,7 +1840,7 @@ static unsigned long shrink_list(enum lru_list lru, unsigned long nr_to_scan,
 
 static int vmscan_swappiness(struct scan_control *sc)
 {
-	if (scanning_global_lru(sc))
+	if (global_reclaim(sc))
 		return vm_swappiness;
 	return mem_cgroup_swappiness(sc->mem_cgroup);
 }
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