[PATCH 06/15] perf evlist: Support using -f to override perf.data file ownership

From: Arnaldo Carvalho de Melo
Date: Thu Apr 02 2015 - 18:29:44 EST

From: Yunlong Song <yunlong.song@xxxxxxxxxx>

Enable perf evlist to use perf.data when it is not owned by current user
or root.


# perf record ls
# chown Yunlong.Song:Yunlong.Song perf.data
# ls -al perf.data
-rw------- 1 Yunlong.Song Yunlong.Song 28260 Apr 2 10:18 perf.data
# id
uid=0(root) gid=0(root) groups=0(root),64(pkcs11)

Before this patch:

# perf evlist
File perf.data not owned by current user or root (use -f to override)
# perf evlist -f
Error: unknown switch `f'

usage: perf evlist [<options>]

-i, --input <file> Input file name
-F, --freq Show the sample frequency
-v, --verbose Show all event attr details
-g, --group Show event group information

As shown above, the -f option does not work at all.

After this patch:

# perf evlist
File perf.data not owned by current user or root (use -f to override)
# perf evlist -f

As shown above, the -f option really works now.

Signed-off-by: Yunlong Song <yunlong.song@xxxxxxxxxx>
Tested-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1427982439-27388-2-git-send-email-yunlong.song@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
tools/perf/builtin-evlist.c | 2 ++
tools/perf/util/evsel.h | 1 +
2 files changed, 3 insertions(+)

diff --git a/tools/perf/builtin-evlist.c b/tools/perf/builtin-evlist.c
index 0f93f859b782..695ec5a50cf2 100644
--- a/tools/perf/builtin-evlist.c
+++ b/tools/perf/builtin-evlist.c
@@ -24,6 +24,7 @@ static int __cmd_evlist(const char *file_name, struct perf_attr_details *details
struct perf_data_file file = {
.path = file_name,
+ .force = details->force,

session = perf_session__new(&file, 0, NULL);
@@ -47,6 +48,7 @@ int cmd_evlist(int argc, const char **argv, const char *prefix __maybe_unused)
"Show all event attr details"),
OPT_BOOLEAN('g', "group", &details.event_group,
"Show event group information"),
+ OPT_BOOLEAN('f', "force", &details.force, "don't complain, do it"),
const char * const evlist_usage[] = {
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index dcf202aebe9f..c5a43d6b13dc 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -335,6 +335,7 @@ struct perf_attr_details {
bool freq;
bool verbose;
bool event_group;
+ bool force;

int perf_evsel__fprintf(struct perf_evsel *evsel,

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