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authorArjan van de Ven <arjan@linux.intel.com>2010-03-11 17:04:36 -0500
committerThomas Gleixner <tglx@linutronix.de>2010-04-06 15:50:02 -0400
commit3bbb9ec946428b96657126768f65487a48dd090c (patch)
treeb560e8c15102281a110cd5ccd93866084e31014b /Makefile
parent3d0205bd1383aa3cac93c209b7c7d03b27930195 (diff)
timers: Introduce the concept of timer slack for legacy timers
While HR timers have had the concept of timer slack for quite some time now, the legacy timers lacked this concept, and had to make do with round_jiffies() and friends. Timer slack is important for power management; grouping timers reduces the number of wakeups which in turn reduces power consumption. This patch introduces timer slack to the legacy timers using the following pieces: * A slack field in the timer struct * An api (set_timer_slack) that callers can use to set explicit timer slack * A default slack of 0.4% of the requested delay for callers that do not set any explicit slack * Rounding code that is part of mod_timer() that tries to group timers around jiffies values every 'power of two' (so quick timers will group around every 2, but longer timers will group around every 4, 8, 16, 32 etc) Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Cc: johnstul@us.ibm.com Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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