linux-kernel - Re: [PATCH v2] perf ftrace latency: Add -e option to measure time between two events

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Message-Id: <175260110062.3546942.14666650771483286173.b4-ty@kernel.org>
Date: Tue, 15 Jul 2025 10:38:20 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>, 
 Ian Rogers <irogers@...gle.com>, Kan Liang <kan.liang@...ux.intel.com>, 
 Namhyung Kim <namhyung@...nel.org>
Cc: Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>, 
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>, 
 LKML <linux-kernel@...r.kernel.org>, linux-perf-users@...r.kernel.org, 
 Song Liu <song@...nel.org>, bpf@...r.kernel.org
Subject: Re: [PATCH v2] perf ftrace latency: Add -e option to measure time
 between two events

On Sun, 13 Jul 2025 22:21:43 -0700, Namhyung Kim wrote:
> In addition to the function latency, it can measure events latencies.
> Some kernel tracepoints are paired and it's menningful to measure how
> long it takes between the two events.  The latency is tracked for the
> same thread.
> 
> Currently it only uses BPF to do the work but it can be lifted later.
> Instead of having separate a BPF program for each tracepoint, it only
> uses generic 'event_begin' and 'event_end' programs to attach to any
> (raw) tracepoints.
> 
> [...]
Applied to perf-tools-next, thanks!

Best regards,
Namhyung