Sometimes, application responses become bad under heavy memory load.
Applications take a bit time to reclaim memory.
The statistics, how long memory reclaim takes, will be useful to
measure memory usage.

This patch adds accounting memory reclaim to per-task-delay-accounting
for accounting the time of do_try_to_free_pages().

looks good to me.

	Acked-by: KOSAKI Motohiro [off-list ref]



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