linux-kernel - Re: [GIT PULL timers] Timer-wheel bandaids^Wcommits for 3.15

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Message-ID: <20140228161037.GB11910@linux.vnet.ibm.com>
Date:	Fri, 28 Feb 2014 08:10:37 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Mike Galbraith <bitbucket@...ine.de>
Cc:	tglx@...utronix.de, mingo@...nel.org, linux-kernel@...r.kernel.org,
	josh@...htriplett.org, peterz@...radead.org, oleg@...hat.com,
	rostedt@...dmis.org
Subject: Re: [GIT PULL timers] Timer-wheel bandaids^Wcommits for 3.15

On Fri, Feb 28, 2014 at 06:06:38AM +0100, Mike Galbraith wrote:
> On Thu, 2014-02-27 at 17:27 -0800, Paul E. McKenney wrote: 
> > Hello, Thomas and Ingo,
> > 
> > This pull request contains latency bandaids^Woptimizations to the
> > timer-wheel code that are useful in conjunction with NO_HZ_FULL Kconfig
> > option.  These optimizations reduce the jiffy-by-jiffy looping in cases
> > where there is either zero or one timers in the timer wheel, which is
> > a common case for NO_HZ_FULL "worker" CPUs that run almost entirely
> > in usermode for a single task.
> 
> FWIW, these have seen quite a bit of runtime on various boxen, both in
> day to day and piddle about -rt kernels, with zero attention grabbers.

Thank you very much for your testing efforts, Mike!

							Thanx, Paul

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