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Message-Id: <20201225222109.364465-1-jolsa@kernel.org>
Date: Fri, 25 Dec 2020 23:21:09 +0100
From: Jiri Olsa <jolsa@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: lkml <linux-kernel@...r.kernel.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Ingo Molnar <mingo@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Namhyung Kim <namhyung@...nel.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Michael Petlan <mpetlan@...hat.com>,
Ian Rogers <irogers@...gle.com>,
Stephane Eranian <eranian@...gle.com>,
Alexei Budankov <abudankov@...wei.com>
Subject: [PATCH] perf tools: Detect when pipe is passed as perf data
Currently we allow pipe input/output only through '-' string
being passed to '-o' or '-i' options, like:
# mkfifo perf.pipe
# perf record --no-buffering -e 'sched:sched_switch' -o - > perf.pipe &
[1] 354406
# cat perf.pipe | ./perf --no-pager script -i - | head -3
perf 354406 [000] 168190.164921: sched:sched_switch: perf:354406..
migration/0 12 [000] 168190.164928: sched:sched_switch: migration/0:..
perf 354406 [001] 168190.164981: sched:sched_switch: perf:354406..
...
This patch detects if given path is pipe and set the perf data
object accordingly, so it's possible now to do above with:
# mkfifo perf.pipe
# perf record --no-buffering -e 'sched:sched_switch' -o perf.pipe &
[1] 360188
# perf --no-pager script -i ./perf.pipe | head -3
perf 354442 [000] 168275.464895: sched:sched_switch: perf:354442..
migration/0 12 [000] 168275.464902: sched:sched_switch: migration/0:..
perf 354442 [001] 168275.464953: sched:sched_switch: perf:354442..
It's of course possible to combine any of above ways.
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
tools/perf/util/data.c | 27 +++++++++++++++++++++------
1 file changed, 21 insertions(+), 6 deletions(-)
diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index f29af4fc3d09..767b6c903cf5 100644
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -159,7 +159,7 @@ int perf_data__update_dir(struct perf_data *data)
return 0;
}
-static bool check_pipe(struct perf_data *data)
+static int check_pipe(struct perf_data *data)
{
struct stat st;
bool is_pipe = false;
@@ -172,6 +172,15 @@ static bool check_pipe(struct perf_data *data)
} else {
if (!strcmp(data->path, "-"))
is_pipe = true;
+ else if (!stat(data->path, &st) && S_ISFIFO(st.st_mode)) {
+ int flags = perf_data__is_read(data) ?
+ O_RDONLY : O_WRONLY|O_CREAT|O_TRUNC;
+
+ fd = open(data->path, flags);
+ if (fd < 0)
+ return -EINVAL;
+ is_pipe = true;
+ }
}
if (is_pipe) {
@@ -190,7 +199,8 @@ static bool check_pipe(struct perf_data *data)
}
}
- return data->is_pipe = is_pipe;
+ data->is_pipe = is_pipe;
+ return 0;
}
static int check_backup(struct perf_data *data)
@@ -344,8 +354,11 @@ static int open_dir(struct perf_data *data)
int perf_data__open(struct perf_data *data)
{
- if (check_pipe(data))
- return 0;
+ int err;
+
+ err = check_pipe(data);
+ if (err || data->is_pipe)
+ return err;
/* currently it allows stdio for pipe only */
data->use_stdio = false;
@@ -410,8 +423,10 @@ int perf_data__switch(struct perf_data *data,
{
int ret;
- if (check_pipe(data))
- return -EINVAL;
+ ret = check_pipe(data);
+ if (ret || data->is_pipe)
+ return ret;
+
if (perf_data__is_read(data))
return -EINVAL;
--
2.26.2
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