linux-kernel - Re: [RFC 00/12] perf record: Add event action support

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Message-ID: <0aecb442-ede7-44ce-824e-6fc0271207b7@intel.com>
Date: Thu, 28 Nov 2024 15:53:45 +0200
From: Adrian Hunter <adrian.hunter@...el.com>
To: Yang Jihong <yangjihong@...edance.com>, peterz@...radead.org,
 mingo@...hat.com, acme@...nel.org, namhyung@...nel.org,
 mark.rutland@....com, alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
 irogers@...gle.com, kan.liang@...ux.intel.com, james.clark@....com,
 linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 00/12] perf record: Add event action support

On 28/11/24 15:35, 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.

Why not just pipe 'perf record' to 'perf script'?

# perf record -e sched:sched_switch | perf script | head
            perf  768231 [000] 2318380.474267: sched:sched_switch: perf:768231 [120] R ==> migration/0:18 [0]
     migration/0      18 [000] 2318380.474294: sched:sched_switch: migration/0:18 [0] S ==> swapper/0:0 [120]
            perf  768231 [001] 2318380.474353: sched:sched_switch: perf:768231 [120] R ==> migration/1:23 [0]
     migration/1      23 [001] 2318380.474382: sched:sched_switch: migration/1:23 [0] S ==> swapper/1:0 [120]
            perf  768231 [002] 2318380.474477: sched:sched_switch: perf:768231 [120] R ==> migration/2:29 [0]
     migration/2      29 [002] 2318380.474503: sched:sched_switch: migration/2:29 [0] S ==> swapper/2:0 [120]
            perf  768231 [003] 2318380.474513: sched:sched_switch: perf:768231 [120] R ==> migration/3:35 [0]
     migration/3      35 [003] 2318380.474523: sched:sched_switch: migration/3:35 [0] S ==> swapper/3:0 [120]
            perf  768231 [004] 2318380.474534: sched:sched_switch: perf:768231 [120] R ==> migration/4:41 [0]
     migration/4      41 [004] 2318380.474541: sched:sched_switch: migration/4:41 [0] S ==> swapper/4:0 [120]