From: robert.richter@amd•com (Robert Richter)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 4/6] perf-events: export enable/disable event symbols to kernel modules
Date: Wed, 10 Mar 2010 16:01:21 +0100 [thread overview]
Message-ID: <20100310150121.GA1585@erda.amd.com> (raw)
In-Reply-To: <1268231442.5279.1.camel@twins>
On 10.03.10 15:30:42, Peter Zijlstra wrote:
> On Wed, 2010-03-10 at 11:47 +0000, Will Deacon wrote:
> > Hello Peter,
> >
> > > On Wed, 2010-03-10 at 10:41 +0000, Will Deacon wrote:
> > > > The perf_event_enable and perf_event_disable functions are used to
> > > > control the activation of perf-events for a given context or CPU.
> > > >
> > > > This patch exports these symbols so that they can be used by kernel
> > > > modules. Without these symbols, an event must be destroyed and recreated
> > > > to disable or enable it respectively. The maximum number of perf-events
> > > > is also made available to modules via the perf_get_max_events function.
> > >
> > > Where is the module that uses all this?
> >
> > It's part of the same patchset:
> >
> > http://lists.infradead.org/pipermail/linux-arm-kernel/2010-March/011126.html
> >
> > The idea is to use perf-events as the backend for OProfile to avoid replicating
> > the PMU accessor code.
>
> Ah, very nice. Can something like that be done in general, like an
> arch-independent oprofile backend using perf, or is there too much
> arch-specific bits to the oprofile stuff?
>
> I know Robert talked about doing something like this, I just have no
> clue how arch specific this would be.
Thanks for cc'ing me. I like this approach. Will take a look at the
patches.
Yes, for implementing oprofile on top of perf we have to touch every
architecture separately to be backward compatible.
-Robert
--
Advanced Micro Devices, Inc.
Operating System Research Center
email: robert.richter at amd.com
next prev parent reply other threads:[~2010-03-10 15:01 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-10 10:41 [PATCH 0/6] ARM: oprofile: use perf-events framework as backend [v2] Will Deacon
2010-03-10 10:41 ` [PATCH 1/6] ARM: perf-events: add Realview PMU IRQs to pmu.c Will Deacon
2010-03-10 10:41 ` [PATCH 2/6] ARM: perf-events: use numeric ID to identify PMU Will Deacon
2010-03-10 10:41 ` [PATCH 3/6] ARM: perf-events: add support for xscale PMUs Will Deacon
2010-03-10 10:41 ` [PATCH 4/6] perf-events: export enable/disable event symbols to kernel modules Will Deacon
2010-03-10 10:41 ` [PATCH 5/6] ARM: oprofile: use perf-events framework as backend Will Deacon
2010-03-10 10:41 ` [PATCH 6/6] ARM: oprofile: remove old files and update KConfig Will Deacon
2010-03-10 10:56 ` [PATCH 4/6] perf-events: export enable/disable event symbols to kernel modules Peter Zijlstra
2010-03-10 11:47 ` Will Deacon
2010-03-10 14:30 ` Peter Zijlstra
2010-03-10 14:41 ` Will Deacon
2010-03-10 15:01 ` Robert Richter [this message]
2010-03-10 11:03 ` [PATCH 2/6] ARM: perf-events: use numeric ID to identify PMU Jamie Iles
2010-03-10 21:59 ` [PATCH 1/6] ARM: perf-events: add Realview PMU IRQs to pmu.c Tony Lindgren
2010-03-10 22:27 ` Albin Tonnerre
2010-03-10 22:34 ` Tony Lindgren
-- strict thread matches above, loose matches on Subject: below --
2010-02-25 18:56 [PATCH 0/6] ARM: oprofile: use perf-events framework as backend Will Deacon
2010-02-25 18:56 ` [PATCH 1/6] ARM: perf-events: add Realview PMU IRQs to pmu.c Will Deacon
2010-02-25 18:56 ` [PATCH 2/6] ARM: perf-events: use numeric ID to identify PMU Will Deacon
2010-02-25 18:56 ` [PATCH 3/6] ARM: perf-events: add support for xscale PMUs Will Deacon
2010-02-25 18:56 ` [PATCH 4/6] perf-events: export enable/disable event symbols to kernel modules Will Deacon
2010-02-26 8:23 ` Ingo Molnar
2010-02-26 9:53 ` Will Deacon
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=20100310150121.GA1585@erda.amd.com \
--to=robert.richter@amd$(echo .)com \
--cc=linux-arm-kernel@lists$(echo .)infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
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