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authorThomas Gleixner <tglx@linutronix.de>2011-05-21 01:14:04 +0400
committerThomas Gleixner <tglx@linutronix.de>2011-05-23 15:59:54 +0400
commit68fa61c026057a39d6ccb850aa8785043afbee02 (patch)
treeaa8a96849d4bd9b1e46c602d398cda0e72d4115c /fs
parentab8177bc53e8ae3a3ba6d200ce2c2dae263f7ee5 (diff)
downloadlinux-68fa61c026057a39d6ccb850aa8785043afbee02.tar.xz
hrtimers: Reorder clock bases
The ordering of the clock bases is historical due to the CLOCK_REALTIME and CLOCK_MONOTONIC constants. Now the hrtimer bases have their own enumeration due to the gap between CLOCK_MONOTONIC and CLOCK_BOOTTIME. So we can be more clever as most timers end up on the CLOCK_MONOTONIC base due to the virtue of POSIX declaring that relative CLOCK_REALTIME timers are not affected by time changes. In desktop environments this is slowly changing as applications switch to absolute timers, but I've observed empty CLOCK_REALTIME bases often enough. There is no performance penalty or overhead when CLOCK_REALTIME timers are active, but in case they are not we don't skip over a full cache line. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Peter Zijlstra <peterz@infradead.org>
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