From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: kosaki.motohiro@jp.fujitsu.com,
Andrew Clayton <andrew@digital-domain.net>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mel@csn.ul.ie>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Dave Chinner <david@fromorbit.com>,
Chris Mason <chris.mason@oracle.com>,
Nick Piggin <npiggin@suse.de>, Rik van Riel <riel@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Jens Axboe <axboe@kernel.dk>,
Christoph Hellwig <hch@infradead.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Andrea Arcangeli <aarcange@redhat.com>,
"pvz@pvz.pp.se" <pvz@pvz.pp.se>,
"bgamari@gmail.com" <bgamari@gmail.com>,
"larppaxyz@gmail.com" <larppaxyz@gmail.com>,
"seanj@xyke.com" <seanj@xyke.com>,
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<kernel-bugs.dev1world@spamgourmet.com>,
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"frankrq2009@gmx.com" <frankrq2009@gmx.com>,
"thomas.pi@arcor.de" <thomas.pi@arcor.de>,
"spawels13@gmail.com" <spawels13@gmail.com>,
"vshader@gmail.com" <vshader@gmail.com>,
"rockorequin@hotmail.com" <rockorequin@hotmail.com>,
"ylalym@gmail.com" <ylalym@gmail.com>,
"theholyettlz@googlemail.com" <theholyettlz@googlemail.com>,
"hassium@yandex.ru" <hassium@yandex.ru>
Subject: Re: Bug 12309 - Large I/O operations result in poor interactive performance and high iowait times
Date: Tue, 3 Aug 2010 15:35:35 +0900 (JST) [thread overview]
Message-ID: <20100803153420.39FD.A69D9226@jp.fujitsu.com> (raw)
In-Reply-To: <20100802115748.GA5308@localhost>
> > It mean congestion ignorerance is happend when followings
> > (1) the task is kswapd
> > (2) the task is flusher thread
> > (3) this reclaim is called from zone reclaim (note: I'm thinking this is bug)
> > (4) this reclaim is called from __generic_file_aio_write()
> >
> > (4) is root cause of this latency issue. this behavior was introduced
> > by following.
>
> Yes and no.
>
> (1)-(4) are good summaries for regular files. However !bdi_write_congested(bdi)
> is now unconditionally true for the swapper_space, which means any process can
> do swap out to a congested queue and block there.
Oops. I missed that. thanks correct me!
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next prev parent reply other threads:[~2010-08-03 6:30 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20100802003616.5b31ed8b@digital-domain.net>
2010-08-02 8:12 ` Wu Fengguang
2010-08-02 9:16 ` KOSAKI Motohiro
2010-08-02 11:57 ` Wu Fengguang
2010-08-02 23:36 ` Minchan Kim
2010-08-03 0:45 ` Wu Fengguang
2010-08-03 6:35 ` KOSAKI Motohiro [this message]
2010-08-02 23:32 ` Minchan Kim
2010-08-03 1:40 ` Wu Fengguang
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