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From: Larry Woodman on 14 Jun 2010 17:00
On Mon, 2010-06-14 at 12:17 +0100, Mel Gorman wrote:
> This patch adds a trace event for when page reclaim queues a page for IO and
> records whether it is synchronous or asynchronous. Excessive synchronous
> IO for a process can result in noticeable stalls during direct reclaim.
> Excessive IO from page reclaim may indicate that the system is seriously
> under provisioned for the amount of dirty pages that exist.
> Signed-off-by: Mel Gorman <mel(a)csn.ul.ie>
Acked-by: Larry Woodman <lwoodman(a)redhat.com>
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