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Message-ID: <20241101211757.824743-2-ctshao@google.com>
Date: Fri, 1 Nov 2024 21:17:56 +0000
From: Chun-Tse Shao <ctshao@...gle.com>
To: linux-kernel@...r.kernel.org
Cc: 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>,
Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>,
Liang Kan <kan.liang@...ux.intel.com>, Ze Gao <zegao2021@...il.com>,
Chun-Tse Shao <ctshao@...gle.com>, Yang Jihong <yangjihong1@...wei.com>,
Weilin Wang <weilin.wang@...el.com>, linux-perf-users@...r.kernel.org
Subject: [PATCH v2 2/3] perf: Reveal PMU type in fdinfo
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-attr.type: 0
perf_event-attr.config: 0
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..c950b6fc92cda 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -55,6 +55,7 @@
#include <linux/pgtable.h>
#include <linux/buildid.h>
#include <linux/task_work.h>
+#include <linux/seq_file.h>
#include "internal.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
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