linux-kernel - Re: [PATCH] Migration of standard timers

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Message-ID: <20060915165810.GA3832@sgi.com>
Date:	Fri, 15 Sep 2006 11:58:10 -0500
From:	Dimitri Sivanich <sivanich@....com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org,
	Andi Kleen <ak@...e.de>
Subject: Re: [PATCH] Migration of standard timers

On Fri, Sep 15, 2006 at 06:39:19PM +0200, Thomas Gleixner wrote:
> 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.

Yes, both latency from long running timer callbacks as well as
potential latency from a temporal grouping of timer callbacks
(those occuring on the same tick).

While I agree that root causes of the former should be addressed,
more latencies of this type can always easily creep in.  Timer
migration works as a long term preventative aid, not just a fix
for the problem of the moment.  And adding this needn't restrict
anyone from looking at the aforementioned root causes.
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