From: Peter Zijlstra <peterz@infradead.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [PATCH] tracing: Add task activate/deactivate tracepoints
Date: Mon, 31 May 2010 10:12:24 +0200 [thread overview]
Message-ID: <1275293544.27810.21478.camel@twins> (raw)
In-Reply-To: <20100531080049.GA435@elte.hu>
On Mon, 2010-05-31 at 10:00 +0200, Ingo Molnar wrote:
> >
> > NAK, aside from a few corner cases wakeup and sleep are the important
> > points.
> >
> > The activate and deactivate functions are implementation details.
>
> Frederic, can you show us a concrete example of where we dont know what is
> going on due to inadequate instrumentation? Can we fix that be extending the
> existing tracepoints?
Right, so a few of those corner cases I mentioned above are things like
re-nice, PI-boosts etc.. Those use deactivate, modify task-state,
activate cycles. so if you want to see those, we can add an explicit
tracepoint for those actions.
An explicit nice/PI-boost tracepoint is much clearer than trying to
figure out wth the deactivate/activate cycle was for.
next prev parent reply other threads:[~2010-05-31 8:12 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-28 14:26 [PATCH] tracing: Add task activate/deactivate tracepoints Frederic Weisbecker
2010-05-28 15:15 ` Peter Zijlstra
2010-05-31 8:00 ` Ingo Molnar
2010-05-31 8:12 ` Peter Zijlstra [this message]
2010-05-31 8:54 ` Peter Zijlstra
2010-05-31 14:36 ` Frederic Weisbecker
2010-05-31 14:43 ` Peter Zijlstra
2010-05-31 14:48 ` Frederic Weisbecker
2010-05-31 16:18 ` Peter Zijlstra
2010-05-31 16:37 ` Steven Rostedt
2010-05-31 18:28 ` Peter Zijlstra
2010-05-31 19:14 ` Steven Rostedt
2010-05-31 19:16 ` Steven Rostedt
2010-05-31 16:51 ` Frederic Weisbecker
2010-06-01 9:13 ` [tip:sched/urgent] sched, trace: Fix sched_switch() prev_state argument tip-bot for Peter Zijlstra
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1275293544.27810.21478.camel@twins \
--to=peterz@infradead.org \
--cc=fweisbec@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=rostedt@goodmis.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox