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Date: Mon, 13 Jan 2014 20:14:50 -0800 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: linux-kernel@...r.kernel.org Cc: mingo@...nel.org, laijs@...fujitsu.com, dipankar@...ibm.com, akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com, josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com, darren@...art.com, fweisbec@...il.com, oleg@...hat.com, sbw@....edu Subject: [PATCH tip/core/rcu 0/3] Crude timer-wheel latency hacks Hello! The following three patches provide some crude timer-wheel latency patches. I understand that a more comprehensive solution is in progress, but in the meantime, these patches work well in cases where a given CPU has either zero or one timers pending, which is a common case for NO_HZ_FULL kernels. So, on the off-chance that this is helpful to someone, the individual patches are as follows: 1. Avoid jiffy-at-a-time stepping when the timer wheel is empty. 2. Avoid jiffy-at-a-time stepping when the timer wheel transitions to empty. 3. Avoid jiffy-at-a-time stepping after a timer is added to an initially empty timer wheel. Thanx, Paul ------------------------------------------------------------------------ b/kernel/timer.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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