Messages in this thread | | | Date | Fri, 6 Apr 2007 12:30:09 -0700 | From | Andrew Morton <> | Subject | Re: preemption and rwsems (was: Re: missing madvise functionality) |
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On Fri, 6 Apr 2007 11:08:22 +0200 Ingo Molnar <mingo@elte.hu> wrote:
> * Andrew Morton <akpm@linux-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.
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