From: Wu Fengguang <fengguang.wu@intel.com>
To: Minchan Kim <minchan.kim@gmail.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Andrew Clayton <andrew@digital-domain.net>,
Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mel@csn.ul.ie>,
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"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>,
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Subject: Re: Bug 12309 - Large I/O operations result in poor interactive performance and high iowait times
Date: Tue, 3 Aug 2010 08:45:11 +0800 [thread overview]
Message-ID: <20100803004511.GB5198@localhost> (raw)
In-Reply-To: <AANLkTimPicvVXnfc1qkuWekzmEz18E=t50yhzaxpToae@mail.gmail.com>
> > What in my mind is (without any throttling)
> >
> > A A A A if (PageSwapcache(page)) {
> > A A A A A A A A if (bdi_write_congested(bdi))
>
> You mentioned following as.
>
> "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."
>
> But you used bdi_write_congested in here.
> Which is right?
Ah sorry, I was also cheated by the name.. bdi_write_congested()
won't work for swap_backing_dev_info. Anyway you may take it as
"pseudo" code :)
Thanks,
Fengguang
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next prev parent reply other threads:[~2010-08-03 0:42 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 ` Bug 12309 - Large I/O operations result in poor interactive performance and high iowait times 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 [this message]
2010-08-03 6:35 ` KOSAKI Motohiro
2010-08-02 23:32 ` Minchan Kim
2010-08-03 1:40 ` Wu Fengguang
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