Re: Context switch times

Mike Kravetz (kravetz@us.ibm.com)
Thu, 4 Oct 2001 21:35:07 -0700

On Fri, Oct 05, 2001 at 02:45:26AM +0200, Andrea Arcangeli wrote:
> doesn't lmbench wakeup only via pipes? Linux uses the sync-wakeup that
> avoids reschedule_idle in such case, to serialize the pipe load in the
> same cpu.

That's what I thought too. However, kernel profile data of a
lmbench run on 2.4.10 reveals that the pipe routines only call
the non-synchronous form of wake_up. I believe I reached the
same conclusion in the 2.4.7 time frame by instrumenting this
code.

-- 
Mike
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