From: Mel Gorman <mgorman@suse.de>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>, XFS <xfs@oss.sgi.com>,
Dave Chinner <david@fromorbit.com>,
Christoph Hellwig <hch@infradead.org>,
Johannes Weiner <jweiner@redhat.com>,
Wu Fengguang <fengguang.wu@intel.com>, Jan Kara <jack@suse.cz>,
Rik van Riel <riel@redhat.com>,
Minchan Kim <minchan.kim@gmail.com>
Subject: Re: [PATCH 1/5] mm: vmscan: Do not writeback filesystem pages in direct reclaim
Date: Thu, 14 Jul 2011 07:19:15 +0100 [thread overview]
Message-ID: <20110714061915.GN7529@suse.de> (raw)
In-Reply-To: <20110714103801.83e10fdb.kamezawa.hiroyu@jp.fujitsu.com>
On Thu, Jul 14, 2011 at 10:38:01AM +0900, KAMEZAWA Hiroyuki wrote:
> > @@ -825,6 +825,15 @@ static unsigned long shrink_page_list(struct list_head *page_list,
> > if (PageDirty(page)) {
> > nr_dirty++;
> >
> > + /*
> > + * Only kswapd can writeback filesystem pages to
> > + * avoid risk of stack overflow
> > + */
> > + if (page_is_file_cache(page) && !current_is_kswapd()) {
> > + inc_zone_page_state(page, NR_VMSCAN_WRITE_SKIP);
> > + goto keep_locked;
> > + }
> > +
>
>
> This will cause tons of memcg OOM kill because we have no help of kswapd (now).
>
> Could you make this
>
> if (scanning_global_lru(sc) && page_is_file_cache(page) && !current_is_kswapd())
> ...
>
I can, but as Christoph points out, the request is already being
ignored so how will it help?
--
Mel Gorman
SUSE Labs
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next prev parent reply other threads:[~2011-07-14 6:19 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-13 14:31 [RFC PATCH 0/5] Reduce filesystem writeback from page reclaim (again) Mel Gorman
2011-07-13 14:31 ` [PATCH 1/5] mm: vmscan: Do not writeback filesystem pages in direct reclaim Mel Gorman
2011-07-13 23:34 ` Dave Chinner
2011-07-14 6:17 ` Mel Gorman
2011-07-14 1:38 ` KAMEZAWA Hiroyuki
2011-07-14 4:46 ` Christoph Hellwig
2011-07-14 4:46 ` KAMEZAWA Hiroyuki
2011-07-14 15:07 ` Christoph Hellwig
2011-07-14 23:55 ` KAMEZAWA Hiroyuki
2011-07-15 2:22 ` Dave Chinner
2011-07-18 2:22 ` Dave Chinner
2011-07-18 3:06 ` Dave Chinner
2011-07-14 6:19 ` Mel Gorman [this message]
2011-07-14 6:17 ` KAMEZAWA Hiroyuki
2011-07-13 14:31 ` [PATCH 2/5] mm: vmscan: Do not writeback filesystem pages in kswapd except in high priority Mel Gorman
2011-07-13 23:37 ` Dave Chinner
2011-07-14 6:29 ` Mel Gorman
2011-07-14 11:52 ` Dave Chinner
2011-07-14 13:17 ` Mel Gorman
2011-07-15 3:12 ` Dave Chinner
2011-07-13 14:31 ` [PATCH 3/5] mm: vmscan: Throttle reclaim if encountering too many dirty pages under writeback Mel Gorman
2011-07-13 23:41 ` Dave Chinner
2011-07-14 6:33 ` Mel Gorman
2011-07-13 14:31 ` [PATCH 4/5] mm: vmscan: Immediately reclaim end-of-LRU dirty pages when writeback completes Mel Gorman
2011-07-13 16:40 ` Johannes Weiner
2011-07-13 17:15 ` Mel Gorman
2011-07-13 14:31 ` [PATCH 5/5] mm: writeback: Prioritise dirty inodes encountered by direct reclaim for background flushing Mel Gorman
2011-07-13 21:39 ` Jan Kara
2011-07-14 0:09 ` Dave Chinner
2011-07-14 7:03 ` Mel Gorman
2011-07-13 23:56 ` Dave Chinner
2011-07-14 7:30 ` Mel Gorman
2011-07-14 15:09 ` Christoph Hellwig
2011-07-14 15:49 ` Mel Gorman
2011-07-13 15:31 ` [RFC PATCH 0/5] Reduce filesystem writeback from page reclaim (again) Mel Gorman
2011-07-14 0:33 ` Dave Chinner
2011-07-14 4:51 ` Christoph Hellwig
2011-07-14 7:37 ` Mel Gorman
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