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authorMel Gorman <mel@csn.ul.ie>2010-10-26 14:21:41 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-26 16:52:07 -0700
commit52bb9198668968506f9d12bf35d7f5d3f094921e (patch)
tree6e1f79c46de902c4462054803eb13115673f8c8c /init
parente11da5b4fdf01d71d73c21cb92b00595b917d7fd (diff)
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writeback: account for time spent congestion_waited
There is strong evidence to indicate a lot of time is being spent in congestion_wait(), some of it unnecessarily. This patch adds a tracepoint for congestion_wait to record when congestion_wait() was called, how long the timeout was for and how long it actually slept. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Reviewed-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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