Re: [PATCH] bdi: use deferable timer for sync_supers task

[Christoph Hellwig]

On Fri, Oct 08, 2010 at 04:35:14PM +0800, Yong Wang wrote:
> sync_supers task currently wakes up periodically for superblock
> writeback. This hurts power on battery driven devices. This patch
> turns this housekeeping timer into a deferable timer so that it
> does not fire when system is really idle.

How long can the timer be defereed?  We can't simply stop writing
out data for a long time.  I think the current timer value should be
the upper bound, but allowing to fire earlier to run during the
same wakeup cycle as others is fine.

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