Re: 2.6.15-ck1

[Dave Jones <davej@redhat.com>]

On Thu, Jan 05, 2006 at 11:49:17AM +1100, Con Kolivas wrote:
 > On Thursday 05 January 2006 11:27, Dave Jones wrote:
 > > On Thu, Jan 05, 2006 at 11:12:51AM +1100, Con Kolivas wrote:
 > >  > On Thursday 05 January 2006 08:40, Radoslaw Szkodzinski wrote:
 > >  > > Arjan van de Ven wrote:
 > >  > > > On Wed, 2006-01-04 at 14:57 -0500, Dave Jones wrote:
 > >  > > >
 > >  > > > sounds like we need some sort of profiler or benchmarker or at least
 > >  > > > a tool that helps finding out which timers are regularly firing,
 > >  > > > with the aim at either grouping them or trying to reduce their
 > >  > > > disturbance in some form.
 > >  > >
 > >  > > You mean something like a modification to timer debugging patch to
 > >  > > record the last time the timer fired, right?
 > >  > > Timertop could then detect the pattern and provide frequency, standard
 > >  > > deviation and other statistical data.
 > >  > > It would be much more expensive to test of course.
 > >  >
 > >  > I don't think the timer debugging patch needs to give out any more info.
 > >  > The userspace tool should be able to do this with the amount of info the
 > >  > timer debugging patch is giving already.
 > >
 > > In the absense of a pointer to a userspace tool, I found the following
 > > handy. (It also fixes a bug where it was printing garbage as process
 > > names).
 > 
 > Timertop and pmstats are here:
 > http://ck.kolivas.org/patches/dyn-ticks/

me no likee.  it's very pretty, but it feels awkward to drive.
Even after I'd stopped it dancing long enough to read, its
output format seemed odd.

With the diff I did, I just piped it through sort -n -k2 | tail
to see the interesting parts.

		Dave