Messages in this thread Patch in this message |  | | | From | "Paul E. McKenney" <> | | Subject | [PATCH rcu 7/8] rcu: Round FAST_NO_HZ lazy timeout to nearest second | | Date | Thu, 7 Jun 2012 21:26:54 -0700 |
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From: "Paul E. McKenney" <paul.mckenney@linaro.org>
Currently, if several CPUs in the same package have all lazy RCU callbacks, their wakeups will be uncorrelated. If all the CPUs are in the same power domain (as is often the case), this will result in unnecessary power-ups of the package. This commit therefore uses round_jiffies() to round the timeouts to a second boundary, increasing the odds that they can be coalesced with each other or with other timeouts.
Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> --- kernel/rcutree_plugin.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h index 5271a02..4451362b 100644 --- a/kernel/rcutree_plugin.h +++ b/kernel/rcutree_plugin.h @@ -2182,7 +2182,7 @@ static void rcu_prepare_for_idle(int cpu) jiffies + RCU_IDLE_GP_DELAY; } else { rdtp->idle_gp_timer_expires = - jiffies + RCU_IDLE_LAZY_GP_DELAY; + round_jiffies(jiffies + RCU_IDLE_LAZY_GP_DELAY); trace_rcu_prep_idle("Dyntick with lazy callbacks"); } tp = &rdtp->idle_gp_timer; -- 1.7.8
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