From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: Michal Hocko <mhocko@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@suse.de>,
linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mm: fix special case -1 order check in compact_finished
Date: Tue, 31 May 2011 13:34:30 +0900 [thread overview]
Message-ID: <20110531133430.d91aa49d.kamezawa.hiroyu@jp.fujitsu.com> (raw)
In-Reply-To: <20110530123831.GG20166@tiehlicka.suse.cz>
On Mon, 30 May 2011 14:38:31 +0200
Michal Hocko <mhocko@suse.cz> wrote:
> 56de7263 (mm: compaction: direct compact when a high-order allocation
> fails) introduced a check for cc->order == -1 in compact_finished. We
> should continue compacting in that case because the request came from
> userspace and there is no particular order to compact for.
>
> The check is, however, done after zone_watermark_ok which uses order as
> a right hand argument for shifts. Not only watermark check is pointless
> if we can break out without it but it also uses 1 << -1 which is not
> well defined (at least from C standard). Let's move the -1 check above
> zone_watermark_ok.
>
> Signed-off-by: Michal Hocko <mhocko@suse.cz>
> Cc: Mel Gorman <mgorman@suse.de>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hioryu@jp.fujitsu.com>
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prev parent reply other threads:[~2011-05-31 4:41 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-30 12:38 Michal Hocko
2011-05-30 12:53 ` Mel Gorman
2011-05-30 15:16 ` Minchan Kim
2011-05-30 15:24 ` [PATCH v2] mm: compaction: fix special case -1 order checks Michal Hocko
2011-05-30 15:37 ` Minchan Kim
2011-06-02 10:38 ` Mel Gorman
2011-05-31 4:34 ` KAMEZAWA Hiroyuki [this message]
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