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McKenney" , Steven Rostedt , Peter Zijlstra , Thomas Gleixner , Sebastian Andrzej Siewior , Juri Lelli , Frederic Weisbecker , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Marc Zyngier , Mark Rutland , Russell King , Nicholas Piggin , Marcelo Tosatti , Guo Ren , "David S. Miller" , Douglas RAILLARD Subject: Re: [RFC PATCH 0/5] Generic IPI sending tracepoint In-Reply-To: <3e680bb9-9896-3665-dd59-4f2e6f8205bb@redhat.com> References: <20221007154145.1877054-1-vschneid@redhat.com> <3e680bb9-9896-3665-dd59-4f2e6f8205bb@redhat.com> Date: Tue, 11 Oct 2022 17:40:26 +0100 Message-ID: MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org On 11/10/22 18:22, Daniel Bristot de Oliveira wrote: > On 10/11/22 18:17, Valentin Schneider wrote: >> Thinking out loud, it makes way more sense to record a cpumask in the >> tracepoint, but perhaps we could have a postprocessing step to transform >> those into N events each targeting a single CPU? > > My approach on the tracers/rtla is to make the simple things in kernel, and beautify > things in user-space. > > You could keep the tracepoint as a mask, and then make it pretty, like cpus=3-5,8 > in user-space. For example with a trace-cmd/perf loadable plugin, libtracefs helper. > That's a nice idea, the one downside I see is that means registering an event handler for all events with cpumasks rather than directly targeting cpumask fields, but that doesn't look too horrible. I'll dig a bit in that direction. > For rtla I was thinking to make a new tool to parse them. and make it pretty there. > > -- Daniel