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authorArnaldo Carvalho de Melo <acme@redhat.com>2017-01-24 19:44:10 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-01-27 18:23:33 +0300
commitecc4c5614b24ee8ebaa35b834b5768dc9302ee3e (patch)
tree31817740c14db1542afc1d9eb11cf0619eaeff77 /tools/perf/perf.c
parentafc45cf52c93009f1f4432e50365ce294ba7a474 (diff)
downloadlinux-ecc4c5614b24ee8ebaa35b834b5768dc9302ee3e.tar.xz
perf tools: Propagate perf_config() errors
Previously these were being ignored, sometimes silently. Stop doing that, emitting debug messages and handling the errors. Testing it: $ cat ~/.perfconfig cat: /home/acme/.perfconfig: No such file or directory $ perf stat -e cycles usleep 1 Performance counter stats for 'usleep 1': 938,996 cycles:u 0.003813731 seconds time elapsed $ perf top --stdio Error: You may not have permission to collect system-wide stats. Consider tweaking /proc/sys/kernel/perf_event_paranoid, <SNIP> [ perf record: Captured and wrote 0.019 MB perf.data (7 samples) ] [acme@jouet linux]$ perf report --stdio # To display the perf.data header info, please use --header/--header-only options. # Overhead Command Shared Object Symbol # ........ ....... ................. ......................... 71.77% usleep libc-2.24.so [.] _dl_addr 27.07% usleep ld-2.24.so [.] _dl_next_ld_env_entry 1.13% usleep [kernel.kallsyms] [k] page_fault $ $ touch ~/.perfconfig $ ls -la ~/.perfconfig -rw-rw-r--. 1 acme acme 0 Jan 27 12:14 /home/acme/.perfconfig $ $ perf stat -e instructions usleep 1 Performance counter stats for 'usleep 1': 244,610 instructions:u 0.000805383 seconds time elapsed $ [root@jouet ~]# chown acme.acme ~/.perfconfig [root@jouet ~]# perf stat -e cycles usleep 1 Warning: File /root/.perfconfig not owned by current user or root, ignoring it. Performance counter stats for 'usleep 1': 937,615 cycles 0.000836931 seconds time elapsed # Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-j2rq96so6xdqlr8p8rd6a3jx@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/perf.c')
-rw-r--r--tools/perf/perf.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 34bcf90f8871..6d5479e03e0d 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -90,11 +90,12 @@ static int pager_command_config(const char *var, const char *value, void *data)
/* returns 0 for "no pager", 1 for "use pager", and -1 for "not specified" */
int check_pager_config(const char *cmd)
{
+ int err;
struct pager_config c;
c.cmd = cmd;
c.val = -1;
- perf_config(pager_command_config, &c);
- return c.val;
+ err = perf_config(pager_command_config, &c);
+ return err ?: c.val;
}
static int browser_command_config(const char *var, const char *value, void *data)
@@ -113,11 +114,12 @@ static int browser_command_config(const char *var, const char *value, void *data
*/
static int check_browser_config(const char *cmd)
{
+ int err;
struct pager_config c;
c.cmd = cmd;
c.val = -1;
- perf_config(browser_command_config, &c);
- return c.val;
+ err = perf_config(browser_command_config, &c);
+ return err ?: c.val;
}
static void commit_pager_choice(void)
@@ -509,6 +511,7 @@ static void cache_line_size(int *cacheline_sizep)
int main(int argc, const char **argv)
{
+ int err;
const char *cmd;
char sbuf[STRERR_BUFSIZE];
int value;
@@ -534,7 +537,9 @@ int main(int argc, const char **argv)
srandom(time(NULL));
perf_config__init();
- perf_config(perf_default_config, NULL);
+ err = perf_config(perf_default_config, NULL);
+ if (err)
+ return err;
set_buildid_dir(NULL);
/* get debugfs/tracefs mount point from /proc/mounts */