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Date: Sat, 11 Feb 2012 09:55:38 -0500
From: Rik van Riel <riel@redhat.com>
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Subject: Re: reclaim the LRU lists full of dirty/writeback pages
References: <CAHH2K0b-+T4dspJPKq5TH25aH58TEr+7yvq0-HMkbFi0ghqAfA@mail.gmail.com> <20120208093120.GA18993@localhost> <CAHH2K0bmURXpk6-4D9q7ErppVyMJjKMsn37MenwqcP_nnT66Mw@mail.gmail.com> <20120210114706.GA4704@localhost> <20120211124445.GA10826@localhost>
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To: Wu Fengguang <fengguang.wu@intel.com>
Cc: Greg Thelen <gthelen@google.com>, Jan Kara <jack@suse.cz>, "bsingharora@gmail.com" <bsingharora@gmail.com>, Hugh Dickins <hughd@google.com>, Michal Hocko <mhocko@suse.cz>, linux-mm@kvack.org, Mel Gorman <mgorman@suse.de>, Ying Han <yinghan@google.com>, "hannes@cmpxchg.org" <hannes@cmpxchg.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Minchan Kim <minchan.kim@gmail.com>

On 02/11/2012 07:44 AM, Wu Fengguang wrote:

> Note that it's data for XFS. ext4 seems to have some problem with the
> workload: the majority pages are found to be writeback pages, and the
> flusher ends up blocking on the unconditional wait_on_page_writeback()
> in write_cache_pages_da() from time to time...
>
> XXX: commit NFS unstable pages via write_inode()
> XXX: the added congestion_wait() may be undesirable in some situations

Even with these caveats, this seems to be the right way forward.

> CC: Jan Kara<jack@suse.cz>
> CC: Mel Gorman<mgorman@suse.de>
> CC: Rik van Riel<riel@redhat.com>
> CC: Greg Thelen<gthelen@google.com>
> CC: Minchan Kim<minchan.kim@gmail.com>
> Signed-off-by: Wu Fengguang<fengguang.wu@intel.com>

Acked-by: Rik van Riel <riel@redhat.com>

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