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perf evsel: Inform how to make a sysctl setting permanent 

When a tool can't open counters due to the kernel.perf_event_paranoit
sysctl setting, we inform how to tweak it to allow the operation to
succeed, in addition to that, suggest setting /etc/sysctl.conf to
make the setting permanent.

Suggested-by: Ingo Molnar <mingo@kernel.org>
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-4gwe99k4a6p12d4u8bbyttj2@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2017-02-13 16:45:24 -03:00
parent e8c6f437fd
commit d6195a6a2c
4 changed files with 6 additions and 4 deletions
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2
tools/perf/builtin-record.c
View File

@ -418,7 +418,7 @@ static int record__mmap(struct record *rec)
static int record__open(struct record *rec)
{
char msg[512];
char msg[BUFSIZ];
struct perf_evsel *pos;
struct perf_evlist *evlist = rec->evlist;
struct perf_session *session = rec->session;

2
tools/perf/builtin-stat.c
View File

@ -533,7 +533,7 @@ static int store_counter_ids(struct perf_evsel *counter)
static int __run_perf_stat(int argc, const char **argv)
{
int interval = stat_config.interval;
char msg[512];
char msg[BUFSIZ];
unsigned long long t0, t1;
struct perf_evsel *counter;
struct timespec ts;

2
tools/perf/builtin-top.c
View File

@ -859,7 +859,7 @@ static void perf_top__mmap_read(struct perf_top *top)
static int perf_top__start_counters(struct perf_top *top)
{
char msg[512];
char msg[BUFSIZ];
struct perf_evsel *counter;
struct perf_evlist *evlist = top->evlist;
struct record_opts *opts = &top->record_opts;

4
tools/perf/util/evsel.c
View File

@ -2469,7 +2469,9 @@ int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
" -1: Allow use of (almost) all events by all users\n"
">= 0: Disallow raw tracepoint access by users without CAP_IOC_LOCK\n"
">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN",
">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN\n\n"
"To make this setting permanent, edit /etc/sysctl.conf too, e.g.:\n\n"
" kernel.perf_event_paranoid = -1\n" ,
target->system_wide ? "system-wide " : "",
perf_event_paranoid());
case ENOENT: