From: Andrew Morton <akpm@linux-foundation.org>
To: Mel Gorman <mgorman@suse.de>
Cc: Jiri Slaby <jslaby@suse.cz>,
Valdis Kletnieks <Valdis.Kletnieks@vt.edu>,
Rik van Riel <riel@redhat.com>,
Zlatko Calusic <zcalusic@bitsync.net>,
Johannes Weiner <hannes@cmpxchg.org>,
dormando <dormando@rydia.net>, Michal Hocko <mhocko@suse.cz>,
Jan Kara <jack@suse.cz>, Dave Chinner <david@fromorbit.com>,
Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Linux-FSDevel <linux-fsdevel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/2] mm: vmscan: Avoid direct reclaim scanning at maximum priority
Date: Wed, 26 Jun 2013 12:39:25 -0700 [thread overview]
Message-ID: <20130626123925.6a15ce3874fa4b0cc8390a0a@linux-foundation.org> (raw)
In-Reply-To: <1372250364-20640-2-git-send-email-mgorman@suse.de>
On Wed, 26 Jun 2013 13:39:23 +0100 Mel Gorman <mgorman@suse.de> wrote:
> Page reclaim at priority 0 will scan the entire LRU as priority 0 is
> considered to be a near OOM condition. Direct reclaim can reach this
> priority while still making reclaim progress. This patch avoids
> reclaiming at priority 0 unless no reclaim progress was made and
> the page allocator would consider firing the OOM killer. The
> user-visible impact is that direct reclaim will not easily reach
> priority 0 and start swapping prematurely.
That's a bandaid.
Priority 0 should be a pretty darn rare condition. How often is it
occurring, and do you know why?
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next prev parent reply other threads:[~2013-06-26 19:39 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-26 12:39 [PATCH 0/2] Reduce system disruption due to kswapd more followup Mel Gorman
2013-06-26 12:39 ` [PATCH 1/2] mm: vmscan: Avoid direct reclaim scanning at maximum priority Mel Gorman
2013-06-26 19:39 ` Andrew Morton [this message]
2013-06-28 8:45 ` Mel Gorman
2013-06-26 12:39 ` [PATCH 2/2] mm: vmscan: Do not scale writeback pages when deciding whether to set ZONE_WRITEBACK Mel Gorman
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