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[79.47.205.133]) by smtp.gmail.com with ESMTPSA id xf13-20020a17090731cd00b00730b3bdd8d7sm7273113ejb.179.2022.10.11.09.22.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 11 Oct 2022 09:22:05 -0700 (PDT) Message-ID: <3e680bb9-9896-3665-dd59-4f2e6f8205bb@redhat.com> Date: Tue, 11 Oct 2022 18:22:03 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.3.1 Subject: Re: [RFC PATCH 0/5] Generic IPI sending tracepoint To: Valentin Schneider Cc: linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org, x86@kernel.org, "Paul E. 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 References: <20221007154145.1877054-1-vschneid@redhat.com> From: Daniel Bristot de Oliveira In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org 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. For rtla I was thinking to make a new tool to parse them. and make it pretty there. -- Daniel