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perf evlist: Support using -f to override perf.data file ownership

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

Example:

 # 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
 cycles

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

Signed-off-by: Yunlong Song <[email protected]>
Tested-by: Arnaldo Carvalho de Melo <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Wang Nan <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
This commit is contained in:
Yunlong Song 2015-04-02 21:47:10 +08:00 • committed by Arnaldo Carvalho de Melo
commit 9e3b6ec173
2 changed files with 3 additions and 0 deletions
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2
tools/perf/builtin-evlist.c
View file

@ -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,
.mode = PERF_DATA_MODE_READ,
.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"),
OPT_END()
};
const char * const evlist_usage[] = {

1
tools/perf/util/evsel.h
View file

@ -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,