From: Peter Zijlstra <peterz@infradead.org>
To: David Ahern <daahern@cisco.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
Ingo Molnar <mingo@elte.hu>,
linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
acme@ghostprotocols.net, paulus@samba.org,
Thomas Gleixner <tglx@linutronix.de>,
Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: Re: [PATCH 3/3] perf events: add timehist option to record and report
Date: Fri, 18 Feb 2011 19:39:59 +0100 [thread overview]
Message-ID: <1298054399.5226.779.camel@laptop> (raw)
In-Reply-To: <4D5EB564.6030504@cisco.com>
On Fri, 2011-02-18 at 11:07 -0700, David Ahern wrote:
> We want not only context-switch events, but the stack trace at the
> switch.
Both ftrace and perf can do that:
perf record -ge sched:sched_switch -c 1
or
echo 1 > /debug/tracing/options/stacktrace
> That data along with the gettimeofday timestamp has allowed us to
> resolve performance issues such as a system call taking longer than
> expected during a specific sequence of events or a process getting
> preempted and not scheduled for N seconds. etc., etc.
Non of that seems to require GTOD stamps.
next prev parent reply other threads:[~2011-02-18 18:38 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-18 5:53 [PATCH 0/3] perf events: Add realtime clock event and timehist option David Ahern
2011-02-18 5:53 ` [PATCH 1/3] perf events: fix WARN_ON_ONCE for 64-bit raw data, SW events David Ahern
2011-02-18 11:00 ` Peter Zijlstra
2011-02-18 14:33 ` David Ahern
2011-02-18 14:53 ` Arnaldo Carvalho de Melo
2011-02-18 15:01 ` Peter Zijlstra
2011-02-18 17:04 ` Arnaldo Carvalho de Melo
2011-02-18 17:13 ` Peter Zijlstra
2011-02-18 17:15 ` David Ahern
2011-02-18 17:17 ` David Ahern
2011-02-18 14:55 ` Peter Zijlstra
2011-02-18 15:28 ` David Ahern
2011-02-18 15:51 ` Peter Zijlstra
2011-02-18 5:53 ` [PATCH 2/3] perf events: Introduce realtime clock event David Ahern
2011-02-18 11:14 ` Peter Zijlstra
2011-02-18 14:39 ` David Ahern
2011-02-18 14:58 ` Peter Zijlstra
2011-02-18 15:35 ` David Ahern
2011-02-18 15:39 ` David Ahern
2011-02-20 12:49 ` Ingo Molnar
2011-02-18 5:53 ` [PATCH 3/3] perf events: add timehist option to record and report David Ahern
2011-02-18 7:06 ` Ingo Molnar
2011-02-18 14:28 ` David Ahern
2011-02-18 17:59 ` Frederic Weisbecker
2011-02-18 18:07 ` David Ahern
2011-02-18 18:39 ` Peter Zijlstra [this message]
2011-02-18 18:45 ` David Ahern
2011-02-19 9:32 ` Ingo Molnar
2011-02-19 14:38 ` Arnaldo Carvalho de Melo
2011-02-18 19:24 ` Frederic Weisbecker
2011-02-18 19:53 ` David Ahern
2011-02-21 21:13 ` Frederic Weisbecker
2011-02-18 18:41 ` Arnaldo Carvalho de Melo
2011-02-18 18:47 ` David Ahern
2011-02-18 18:53 ` David Ahern
2011-02-18 19:06 ` Arnaldo Carvalho de Melo
2011-02-18 19:29 ` Frederic Weisbecker
2011-02-18 20:30 ` Arnaldo Carvalho de Melo
2011-02-21 21:17 ` Frederic Weisbecker
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