Subject: Re: [patch] latency tracer, 2.6.15-rc7
From: Lee Revell <rlrevell@joe-job.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: paulmck@us.ibm.com, Ingo Molnar <mingo@elte.hu>,
       Dave Jones <davej@redhat.com>, Hugh Dickins <hugh@veritas.com>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       Eric Dumazet <dada1@cosmosbay.com>,
       Dipankar Sarma <dipankar@in.ibm.com>, vatsa@in.ibm.com
In-Reply-To: <Pine.LNX.4.64.0601011047320.3668@g5.osdl.org>
References: <20051229202848.GC29546@elte.hu>
	 <1135908980.4568.10.camel@mindpipe> <20051230080032.GA26152@elte.hu>
	 <1135990270.31111.46.camel@mindpipe>
	 <Pine.LNX.4.64.0512301701320.3249@g5.osdl.org>
	 <1135991732.31111.57.camel@mindpipe>
	 <Pine.LNX.4.64.0512301726190.3249@g5.osdl.org>
	 <1136001615.3050.5.camel@mindpipe> <20051231042902.GA3428@us.ibm.com>
	 <1136004855.3050.8.camel@mindpipe>  <20051231201426.GD5124@us.ibm.com>
	 <1136094372.7005.19.camel@mindpipe>
	 <Pine.LNX.4.64.0601011047320.3668@g5.osdl.org>
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Date: Sun, 01 Jan 2006 14:02:07 -0500
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On Sun, 2006-01-01 at 10:56 -0800, Linus Torvalds wrote:
> The thing is, "maxbatch" doesn't actually _work_ because what happens
> is that the tasklet will continually re-schedule itself, and the
> caller will keep calling it. So maxbatch is actually broken.
> 
> However, what happens is that after kernel/softirq.c has called the 
> tasklet ten times, and it is still pending, it will do the softirq in
> a thread (see the "max_restart" logic). 

Ah OK thanks for the explanation.  I'll try Paul's patch (yours did not
seem to help).

Lee

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