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Re: [PATCH] kprobes for s390 architecture
- From: Martin Schwidefsky <schwidefsky at de dot ibm dot com>
- To: Mike Grundy <grundym at us dot ibm dot com>
- Cc: Heiko Carstens <heiko dot carstens at de dot ibm dot com>, Jan Glauber <jan dot glauber at de dot ibm dot com>, linux-kernel at vger dot kernel dot org, systemtap at sources dot redhat dot com
- Date: Tue, 11 Jul 2006 16:13:18 +0200
- Subject: Re: [PATCH] kprobes for s390 architecture
- Organization: IBM Corporation
- References: <20060623150344.GL9446@osiris.boeblingen.de.ibm.com> <OF44DB398C.F7A51098-ON88257196.007CD277-88257196.007DC8F0@us.ibm.com> <20060623222106.GA25410@osiris.ibm.com> <20060624113641.GB10403@osiris.ibm.com> <1151421789.5390.65.camel@localhost> <20060628055857.GA9452@osiris.boeblingen.de.ibm.com> <20060707172333.GA12068@localhost.localdomain> <20060707172555.GA10452@osiris.ibm.com> <20060711135430.GA5070@localhost.localdomain>
- Reply-to: schwidefsky at de dot ibm dot com
On Tue, 2006-07-11 at 09:54 -0400, Mike Grundy wrote:
> I did a little measuring. On average stop_machine_run() adds 8.7 msec of
> overhead on a 4-way config. Of that %57 was sub-msec overhead. For the times
> where overhead was measurable, the average was 20.2 msec, lowest at 10msec
> highest at 100msec. That's on a z800 under vm and I have no idea how many real
> cpus the machine has :-)
So adding 100 probes will roughly take 1 second. Not too bad, I expected it
to take longer.
--
blue skies,
Martin.
Martin Schwidefsky
Linux for zSeries Development & Services
IBM Deutschland Entwicklung GmbH
"Reality continues to ruin my life." - Calvin.