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Wed, 04 Dec 2024 00:35:28 -0800 (PST) Message-ID: Date: Wed, 4 Dec 2024 16:35:21 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [External] Re: [RFC 00/12] perf record: Add event action support Content-Language: en-US To: Namhyung Kim , Arnaldo Carvalho de Melo Cc: peterz@infradead.org, mingo@redhat.com, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, jolsa@kernel.org, irogers@google.com, adrian.hunter@intel.com, kan.liang@linux.intel.com, james.clark@arm.com, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org References: <20241128133553.823722-1-yangjihong@bytedance.com> From: Yang Jihong In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hello, On 12/3/24 05:46, Namhyung Kim wrote: > Hello, > > On Thu, Nov 28, 2024 at 05:14:53PM -0300, Arnaldo Carvalho de Melo wrote: >> On Thu, Nov 28, 2024 at 09:35:41PM +0800, Yang Jihong wrote: >>> In perf-record, when an event is triggered, default behavior is to >>> save sample data to perf.data. Sometimes, we may just want to do >>> some lightweight actions, such as printing a log. >> >>> Based on this requirement, add the --action option to the event to >>> specify the behavior when the event occurs. >> >> 'perf record' is centered on saving data to disk without processing >> events, while it has sideband events for some needs, like processing BPF >> related events (PERF_RECORD_BPF_EVENT to catch PERF_BPF_EVENT_PROG_LOAD >> and UNLOAD), doing things in a "live" way as your patchkit does seems >> more appropriate to do in 'perf trace' :-) > > Agreed, 'perf trace' looks like a better place as you seem to target > tracepoint events mostly. > Okay, will do it in 'perf trace'. Attaching to a kprobe events will also be supported in the future. Thanks, Yang