linux-kernel - Re: preemption and rwsems (was: Re: missing madvise functionality)

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Message-Id: <20070406123010.802c76b4.akpm@linux-foundation.org>
Date:	Fri, 6 Apr 2007 12:30:09 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	David Howells <dhowells@...hat.com>,
	Jakub Jelinek <jakub@...hat.com>,
	Ulrich Drepper <drepper@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Rik van Riel <riel@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-mm@...ck.org, Hugh Dickins <hugh@...itas.com>
Subject: Re: preemption and rwsems (was: Re: missing madvise functionality)

On Fri, 6 Apr 2007 11:08:22 +0200
Ingo Molnar <mingo@...e.hu> wrote:

> * Andrew Morton <akpm@...ux-foundation.org> wrote:
> 
> > > getting a good trace of it is easy: pick up the latest -rt kernel 
> > > from:
> > > 
> > > 	http://redhat.com/~mingo/realtime-preempt/
> > > 
> > > enable EVENT_TRACING in that kernel, run the workload and do:
> > > 
> > > 	scripts/trace-it > to-ingo.txt
> > > 
> > > and send me the output.
> > 
> > Did that - no output was generated.  config at
> > http://userweb.kernel.org/~akpm/config-akpm2.txt
> 
> sorry, i forgot to mention that you should turn off 
> CONFIG_WAKEUP_TIMING.
> 
> i've attached an updated version of trace-it.c, which will turn this off 
> itself, using a sysctl. I also made WAKEUP_TIMING default-off.

ok.  http://userweb.kernel.org/~akpm/to-ingo.txt is the trace of

	taskset -c 0 ./jakubs-test-app

while the system was doing the 150,000 context switches/sec.

It isn't very interesting.
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