From: Peter Zijlstra <peterz@infradead.org>
To: Chun-Tse Shao <ctshao@google.com>
Cc: Ian Rogers <irogers@google.com>, Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>,
Adrian Hunter <adrian.hunter@intel.com>,
James Clark <james.clark@linaro.org>,
Thomas Falcon <thomas.falcon@intel.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org
Subject: Re: [PATCH v8 1/2] perf: Reveal PMU type in fdinfo
Date: Thu, 4 Jun 2026 11:21:40 +0200 [thread overview]
Message-ID: <20260604092140.GE3126523@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <20260602181349.3969429-1-ctshao@google.com>
On Tue, Jun 02, 2026 at 11:13:48AM -0700, Chun-Tse Shao wrote:
> It gives useful info on knowing which PMUs are reserved by this process.
> Also add config which would be useful.
> Testing cycles:
>
> $ ./perf stat -e cycles &
> $ cat /proc/`pidof perf`/fdinfo/3
> pos: 0
> flags: 02000002
> mnt_id: 16
> ino: 3081
> perf_event_attr.type: 0
> perf_event_attr.config: 0x0
> perf_event_attr.config1: 0x0
> perf_event_attr.config2: 0x0
> perf_event_attr.config3: 0x0
> perf_event_attr.config4: 0x0
>
> Testing L1-dcache-load-misses:
>
> $ ./perf stat -e L1-dcache-load-misses &
> $ cat /proc/`pidof perf`/fdinfo/3
> pos: 0
> flags: 02000002
> mnt_id: 16
> ino: 1072
> perf_event_attr.type: 3
> perf_event_attr.config: 0x10000
> perf_event_attr.config1: 0x0
> perf_event_attr.config2: 0x0
> perf_event_attr.config3: 0x0
> perf_event_attr.config4: 0x0
>
> Reviewed-by: Ian Rogers <irogers@google.com>
> Signed-off-by: Chun-Tse Shao <ctshao@google.com>
> Assisted-by: Gemini:gemini-3.1-pro-preview
> ---
Yeah, I suppose I'll take this. But I'm not sure about the wording here.
PMUs aren't really reserved as such.
next prev parent reply other threads:[~2026-06-04 9:21 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-02 18:13 [PATCH v8 1/2] perf: Reveal PMU type in fdinfo Chun-Tse Shao
2026-06-02 18:13 ` [PATCH v8 2/2] perf evsel: Find process with busy PMUs for EBUSY Chun-Tse Shao
2026-06-09 15:58 ` Ian Rogers
2026-06-09 17:20 ` Arnaldo Carvalho de Melo
2026-09-14 1:44 ` Arnaldo Carvalho de Melo
2026-09-14 20:29 ` Chun-Tse Shao
2026-09-15 18:54 ` Ian Rogers
2026-09-15 20:52 ` Chun-Tse Shao
2026-06-04 9:21 ` Peter Zijlstra [this message]
2026-06-09 8:21 ` [tip: perf/core] perf: Reveal PMU type in fdinfo tip-bot2 for Chun-Tse Shao
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