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Re: Fw: systemtap application to find applications doing polling
- From: fche at redhat dot com (Frank Ch. Eigler)
- To: svaidy at linux dot vnet dot ibm dot com
- Cc: William Cohen <wcohen at redhat dot com>, Maneesh Soni <maneesh at in dot ibm dot com>, dipankar at in dot ibm dot com, ananth at in dot ibm dot com, SystemTAP <systemtap at sources dot redhat dot com>, Ulrich Drepper <drepper at redhat dot com>
- Date: Thu, 05 Feb 2009 15:26:55 -0500
- Subject: Re: Fw: systemtap application to find applications doing polling
- References: <20090129164643.GA17621@in.ibm.com> <20090201132815.GA6346@dirshya.in.ibm.com> <4989CB77.20706@redhat.com> <20090205170514.GQ5050@dirshya.in.ibm.com>
Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com> writes:
> [...]
> This wakeup rate is very high and this implies that we should use the
> stap script for a per-application level wakeup tracing only and should
> not try to profile the overall system.
> Definitely some opportunity here for stap to reduce wakeups :)
Yes, will do.
> [...]
>> There has been some work on userspace probing for systemtap. It isn't in a
>> packaged distro yet, but there should be one for fedora coming out soon.
>> However, this needs utrace in the kernel.
>
> Looking forward to this feature. [...]
There is a release 0.8 in fedora that you can experiment with already.
git systemtap is better for shared library probing though.
- FChE