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Message-Id: <1158338360.5724.442.camel@localhost.localdomain> Date: Fri, 15 Sep 2006 18:39:19 +0200 From: Thomas Gleixner <tglx@...utronix.de> To: Dimitri Sivanich <sivanich@....com> Cc: linux-kernel@...r.kernel.org, akpm@...l.org, Andi Kleen <ak@...e.de> Subject: Re: [PATCH] Migration of standard timers On Thu, 2006-09-14 at 08:29 -0500, Dimitri Sivanich wrote: > This patch allows the user to migrate currently queued > standard timers from one cpu to another, thereby reducing > timer induced latency on the chosen cpu. Timers that > were placed with add_timer_on() are considered to have > 'cpu affinity' and are not moved. > > The changes in drivers/base/cpu.c provide a clean and > convenient interface for triggering the migration through > sysfs, via writing the destination cpu number to a file > associated with the source cpu. > > Note that migrating timers will not, by itself, keep new > timers off of the chosen cpu. But with careful control of > thread affinity, one can control the affinity of new timers > and keep timer induced latencies off of the chosen cpu. > > This particular patch does not affect the hrtimers. That > could be addressed later. Are you trying to work around the latencies caused by long running timer callbacks ? I'm not convinced that this is not curing the symptoms instead of the root cause. tglx - 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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