From: Alexander Gordeev <agordeev@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org, x86@kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>,
Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
Jiri Olsa <jolsa@redhat.com>,
Frederic Weisbecker <fweisbec@gmail.com>
Subject: Re: [PATCH RFC -tip 0/6] perf: IRQ-bound performance events
Date: Tue, 4 Jun 2013 12:14:36 +0200 [thread overview]
Message-ID: <20130604101436.GA22914@dhcp-26-207.brq.redhat.com> (raw)
In-Reply-To: <20130604093802.GK8923@twins.programming.kicks-ass.net>
On Tue, Jun 04, 2013 at 11:38:02AM +0200, Peter Zijlstra wrote:
> > Oops, the most interesting part did not make it in. Very sorry :) Here:
> >
> > # ./tools/perf/perf stat -I 8 -a -e L1-dcache-load-misses:k hwclock --test
> > Mon 03 Jun 2013 09:32:49 AM EDT -0.719514 seconds
> >
> > Performance counter stats for process id '8':
> >
> > 447 L1-dcache-load-misses
>
> I think that is very much expected; except in the case where you spend
> _all_ your time in IRQ handlers, they'll pretty much always miss l1
> cache.
The emphasis was on the fact it indeed could be measured for a particular ISR ;)
--
Regards,
Alexander Gordeev
agordeev@redhat.com
prev parent reply other threads:[~2013-06-04 10:13 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-03 9:41 Alexander Gordeev
2013-06-03 12:22 ` Ingo Molnar
2013-06-03 19:41 ` Frederic Weisbecker
2013-06-04 8:51 ` Jiri Olsa
2013-06-03 13:36 ` Alexander Gordeev
2013-06-04 9:38 ` Peter Zijlstra
2013-06-04 10:14 ` Alexander Gordeev [this message]
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