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perf record: Add '--timestamp-filename' option to append timestamp to output file name 

This option appends current timestamp to the output file name.

For example:

  # perf record -a --timestamp-filename
  ^C[ perf record: Woken up 1 times to write data ]
  [ perf record: Dump perf.data.2015122622265847 ]
  [ perf record: Captured and wrote 0.742 MB perf.data.<timestamp> (90 samples) ]
  # ls
  perf.data.201512262226584

The timestamp will be useful for identifying each perf.data after the
'perf record' support for generating multiple output files gets
introduced.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1460535673-159866-5-git-send-email-wangnan0@huawei.com
Signed-off-by: He Kuang <hekuang@huawei.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wang Nan 2016-04-13 08:21:07 +00:00 committed by Arnaldo Carvalho de Melo
parent c0bdc1c461
commit ecfd7a9c04
1 changed files with 49 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

53
tools/perf/builtin-record.c
View File

@ -56,6 +56,7 @@ struct record {
bool no_buildid_cache;
bool no_buildid_cache_set;
bool buildid_all;
bool timestamp_filename;
unsigned long long samples;
};
@ -531,6 +532,37 @@ record__finish_output(struct record *rec)
return;
}
static int
record__switch_output(struct record *rec, bool at_exit)
{
struct perf_data_file *file = &rec->file;
int fd, err;
/* Same Size: "2015122520103046"*/
char timestamp[] = "InvalidTimestamp";
rec->samples = 0;
record__finish_output(rec);
err = fetch_current_timestamp(timestamp, sizeof(timestamp));
if (err) {
pr_err("Failed to get current timestamp\n");
return -EINVAL;
}
fd = perf_data_file__switch(file, timestamp,
rec->session->header.data_offset,
at_exit);
if (fd >= 0 && !at_exit) {
rec->bytes_written = 0;
rec->session->header.data_size = 0;
}
if (!quiet)
fprintf(stderr, "[ perf record: Dump %s.%s ]\n",
file->path, timestamp);
return fd;
}
static volatile int workload_exec_errno;
/*
@ -865,11 +897,22 @@ out_child:
/* this will be recalculated during process_buildids() */
rec->samples = 0;
if (!err)
record__finish_output(rec);
if (!err) {
if (!rec->timestamp_filename) {
record__finish_output(rec);
} else {
fd = record__switch_output(rec, true);
if (fd < 0) {
status = fd;
goto out_delete_session;
}
}
}
if (!err && !quiet) {
char samples[128];
const char *postfix = rec->timestamp_filename ?
".<timestamp>" : "";
if (rec->samples && !rec->opts.full_auxtrace)
scnprintf(samples, sizeof(samples),
@ -877,9 +920,9 @@ out_child:
else
samples[0] = '\0';
fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s ]\n",
fprintf(stderr, "[ perf record: Captured and wrote %.3f MB %s%s%s ]\n",
perf_data_file__size(file) / 1024.0 / 1024.0,
file->path, samples);
file->path, postfix, samples);
}
out_delete_session:
@ -1249,6 +1292,8 @@ struct option __record_options[] = {
"file", "vmlinux pathname"),
OPT_BOOLEAN(0, "buildid-all", &record.buildid_all,
"Record build-id of all DSOs regardless of hits"),
OPT_BOOLEAN(0, "timestamp-filename", &record.timestamp_filename,
"append timestamp to output filename"),
OPT_END()
};