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Re: systemtap broken by removal of register_timer_hook
- From: Ingo Molnar <mingo at kernel dot org>
- To: "Frank Ch. Eigler" <fche at redhat dot com>
- Cc: Frederic Weisbecker <fweisbec at gmail dot com>, Mel Gorman <mgorman at suse dot de>, LKML <linux-kernel at vger dot kernel dot org>, SystemTap <systemtap at sourceware dot org>
- Date: Wed, 10 Apr 2013 13:24:56 +0200
- Subject: Re: systemtap broken by removal of register_timer_hook
- References: <20130403075017 dot GA2534 at suse dot de> <CAFTL4hyYezB2ZxM-GJ70VoxOeRSG64V6u+nX2hTuhF30R-GdPg__32168 dot 962484184$1364986928$gmane$org at mail dot gmail dot com> <y0mvc83u79f dot fsf at fche dot csb> <CAFTL4hxx_GHoa4uguSAtY0A=cC43qJPKvpqaoguS-WAjFj+HSw at mail dot gmail dot com> <20130403144428 dot GA15432 at redhat dot com>
* Frank Ch. Eigler <fche@redhat.com> wrote:
> Hi -
>
> On Wed, Apr 03, 2013 at 02:49:53PM +0200, Frederic Weisbecker wrote:
>
> > Sounds good, would you like to propose a version? We are also
> > interested in a timer tick event tracepoint for dynticks debugging.
>
> How about this?
>
> Author: Frank Ch. Eigler <fche@redhat.com>
> Date: Wed Apr 3 10:35:21 2013 -0400
>
> profiling: add profile_tick tracepoint
>
> Commit ba6fdda4 removed the timer_hook mechanism for modules to listen
> to profiling timer ticks (without having to set up more complicated
> perf mechanisms). To reduce the impact on out-of-tree users, a
> TRACE_EVENT-flavoured tracepoint is added in its place. Tested with
> perf and systemtap.
I'd suggest mentioning SystemTap here as the driving motivation. SystemTap
triggered a generic kernel improvement here, no need to hide its identity!
Thanks,
Ingo