[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <CAP-5=fVaD8GLhMmM=d4DqHnT24ZDHPAWU56mzSF5OXY=pTO3UA@mail.gmail.com>
Date: Fri, 1 Nov 2024 09:02:22 -0700
From: Ian Rogers <irogers@...gle.com>
To: Chun-Tse Shao <ctshao@...gle.com>
Cc: linux-kernel@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>, Liang@...gle.com, Kan <kan.liang@...ux.intel.com>,
Ze Gao <zegao2021@...il.com>, Yang Jihong <yangjihong1@...wei.com>,
Weilin Wang <weilin.wang@...el.com>, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 2/3] perf: Reveal PMU type in fdinfo
On Thu, Oct 31, 2024 at 3:39 PM Chun-Tse Shao <ctshao@...gle.com> wrote:
>
> It gives useful info on knowing which PMUs are reserved by this process.
> Also add extra attributes 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-orig_type: 0
nit: I think this should be:
perf_event-type: 0
this output was from an earlier version.
> perf_event-attr.config1: 0
> perf_event-attr.config2: 0
> perf_event-attr.config3: 0
>
> 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: 65536
> perf_event-attr.config1: 0
> perf_event-attr.config2: 0
> perf_event-attr.config3: 0
> ```
>
> Signed-off-by: Chun-Tse Shao <ctshao@...gle.com>
> ---
> kernel/events/core.c | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index cdd09769e6c56..e0891c376fd9d 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -8,6 +8,7 @@
> * Copyright © 2009 Paul Mackerras, IBM Corp. <paulus@....ibm.com>
> */
>
> +#include "linux/seq_file.h"
nit: I think you should use angle < > rather than quotes on the
include for consistency.
Thanks,
Ian
> #include <linux/fs.h>
> #include <linux/mm.h>
> #include <linux/cpu.h>
> @@ -6820,6 +6821,17 @@ static int perf_fasync(int fd, struct file *filp, int on)
> return 0;
> }
>
> +static void perf_show_fdinfo(struct seq_file *m, struct file *f)
> +{
> + struct perf_event *event = f->private_data;
> +
> + seq_printf(m, "perf_event-attr.type:\t%u\n", event->orig_type);
> + seq_printf(m, "perf_event-attr.config:\t%llu\n", event->attr.config);
> + seq_printf(m, "perf_event-attr.config1:\t%llu\n", event->attr.config1);
> + seq_printf(m, "perf_event-attr.config2:\t%llu\n", event->attr.config2);
> + seq_printf(m, "perf_event-attr.config3:\t%llu\n", event->attr.config3);
> +}
> +
> static const struct file_operations perf_fops = {
> .release = perf_release,
> .read = perf_read,
> @@ -6828,6 +6840,7 @@ static const struct file_operations perf_fops = {
> .compat_ioctl = perf_compat_ioctl,
> .mmap = perf_mmap,
> .fasync = perf_fasync,
> + .show_fdinfo = perf_show_fdinfo,
> };
>
> /*
> --
> 2.47.0.163.g1226f6d8fa-goog
>
Powered by blists - more mailing lists