linux-kernel - Re: [PATCH v2 tip/core/timers] Crude timer-wheel latency hacks

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Message-ID: <alpine.DEB.2.02.1401152316500.4207@ionos.tec.linutronix.de>
Date:	Wed, 15 Jan 2014 23:22:41 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, niv@...ibm.com, peterz@...radead.org,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	darren@...art.com, fweisbec@...il.com, oleg@...hat.com, sbw@....edu
Subject: Re: [PATCH v2 tip/core/timers] Crude timer-wheel latency hacks

Paul,

On Tue, 14 Jan 2014, Paul E. McKenney wrote:
> 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:

so far that makes sense, though I'd rather like to redesign the whole
timer wheel mess than adding more duct tape to it. I can't dig into
the details right now as I'm dead tired and about to leave for a
funeral. i'll have a detailed look at this at the weekend.

Thanks,

	tglx


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