Messages in this thread Patch in this message |  | | | From | John Stultz <> | | Subject | [PATCH 6/9] time: Reduce timekeeper read lock hold time | | Date | Thu, 1 Mar 2012 23:12:45 -0800 |
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Now that timekeeper updates are done with a shadow copy, we can reduce the readlock hold time to only the update.
CC: Ingo Molnar <mingo@elte.hu> CC: Thomas Gleixner <tglx@linutronix.de> CC: Eric Dumazet <eric.dumazet@gmail.com> CC: Richard Cochran <richardcochran@gmail.com> Signed-off-by: John Stultz <john.stultz@linaro.org> --- kernel/time/timekeeping.c | 5 ++--- 1 files changed, 2 insertions(+), 3 deletions(-) diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index ed8cb51..97982b1 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -1071,7 +1071,6 @@ static void update_wall_time(void) s64 remainder; spin_lock_irqsave(&timekeeper_wlock, flags); - write_seqcount_begin(&timekeeper_rlock); /* Make sure we're fully resumed: */ if (unlikely(timekeeping_suspended)) @@ -1155,13 +1154,13 @@ static void update_wall_time(void) second_overflow(); } - + write_seqcount_begin(&timekeeper_rlock); timekeeper = shadow_tk; timekeeper.clock->cycle_last = timekeeper.cycle_last; timekeeping_update(&timekeeper, false); + write_seqcount_end(&timekeeper_rlock); out: - write_seqcount_end(&timekeeper_rlock); spin_unlock_irqrestore(&timekeeper_wlock, flags); } -- 1.7.3.2.146.gca209
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