Re: [PATCH 03/12] tracing, vmscan: Add trace event when a page iswritten

From: Rik van Riel
Date: Mon Jun 14 2010 - 13:38:20 EST

On 06/14/2010 07:17 AM, 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@xxxxxxxxx>

Acked-by: Rik van Riel <riel@xxxxxxxxxx>

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