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authorArjan van de Ven <arjan@linux.intel.com>2006-12-10 02:21:24 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-10 09:57:22 -0800
commit4c36a5dec25fb344ad76b11860da3a8b50bd1248 (patch)
treefacfe4ad3bb3638d8ee6f6b3e7fc75a0a02e304a /fs/jbd
parent5466b456ed6748e0bfe02831e570004d4c04c1d7 (diff)
[PATCH] round_jiffies infrastructure
Introduce a round_jiffies() function as well as a round_jiffies_relative() function. These functions round a jiffies value to the next whole second. The primary purpose of this rounding is to cause all "we don't care exactly when" timers to happen at the same jiffy. This avoids multiple timers firing within the second for no real reason; with dynamic ticks these extra timers cause wakeups from deep sleep CPU sleep states and thus waste power. The exact wakeup moment is skewed by the cpu number, to avoid all cpus from waking up at the exact same time (and hitting the same lock/cachelines there) [akpm@osdl.org: fix variable type] Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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