diff options
| -rw-r--r-- | tools/perf/builtin-record.c | 2 | ||||
| -rw-r--r-- | tools/perf/builtin-stat.c | 38 | ||||
| -rw-r--r-- | tools/perf/builtin-top.c | 6 |
3 files changed, 29 insertions, 17 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 93bd2ff001fb..d9dd47885218 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -326,7 +326,7 @@ try_again: goto try_again; } printf("\n"); - error("perfcounter syscall returned with %d (%s)\n", + error("sys_perf_event_open() syscall returned with %d (%s). /bin/dmesg may provide additional information.\n", fd[nr_cpu][counter][thread_index], strerror(err)); #if defined(__i386__) || defined(__x86_64__) diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index b3e568ffad27..970a7f2a083d 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -153,9 +153,9 @@ struct stats walltime_nsecs_stats; attrs[counter].config == PERF_COUNT_##c) #define ERR_PERF_OPEN \ -"Error: counter %d, sys_perf_event_open() syscall returned with %d (%s)\n" +"counter %d, sys_perf_event_open() syscall returned with %d (%s). /bin/dmesg may provide additional information." -static int create_perf_stat_counter(int counter) +static int create_perf_stat_counter(int counter, bool *perm_err) { struct perf_event_attr *attr = attrs + counter; int thread; @@ -171,11 +171,14 @@ static int create_perf_stat_counter(int counter) for (cpu = 0; cpu < nr_cpus; cpu++) { fd[cpu][counter][0] = sys_perf_event_open(attr, -1, cpumap[cpu], -1, 0); - if (fd[cpu][counter][0] < 0) - pr_debug(ERR_PERF_OPEN, counter, + if (fd[cpu][counter][0] < 0) { + if (errno == EPERM || errno == EACCES) + *perm_err = true; + error(ERR_PERF_OPEN, counter, fd[cpu][counter][0], strerror(errno)); - else + } else { ++ncreated; + } } } else { attr->inherit = !no_inherit; @@ -186,12 +189,15 @@ static int create_perf_stat_counter(int counter) for (thread = 0; thread < thread_num; thread++) { fd[0][counter][thread] = sys_perf_event_open(attr, all_tids[thread], -1, -1, 0); - if (fd[0][counter][thread] < 0) - pr_debug(ERR_PERF_OPEN, counter, + if (fd[0][counter][thread] < 0) { + if (errno == EPERM || errno == EACCES) + *perm_err = true; + error(ERR_PERF_OPEN, counter, fd[0][counter][thread], strerror(errno)); - else + } else { ++ncreated; + } } } @@ -332,6 +338,7 @@ static int run_perf_stat(int argc __used, const char **argv) int status = 0; int counter, ncreated = 0; int child_ready_pipe[2], go_pipe[2]; + bool perm_err = false; const bool forks = (argc > 0); char buf; @@ -390,12 +397,15 @@ static int run_perf_stat(int argc __used, const char **argv) } for (counter = 0; counter < nr_counters; counter++) - ncreated += create_perf_stat_counter(counter); - - if (ncreated == 0) { - pr_err("No permission to collect %sstats.\n" - "Consider tweaking /proc/sys/kernel/perf_event_paranoid.\n", - system_wide ? "system-wide " : ""); + ncreated += create_perf_stat_counter(counter, &perm_err); + + if (ncreated < nr_counters) { + if (perm_err) + error("You may not have permission to collect %sstats.\n" + "\t Consider tweaking" + " /proc/sys/kernel/perf_event_paranoid or running as root.", + system_wide ? "system-wide " : ""); + die("Not all events could be opened.\n"); if (child_pid != -1) kill(child_pid, SIGTERM); return -1; diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index dd625808c2a5..3d2b47d5121a 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -1214,7 +1214,9 @@ try_again: int err = errno; if (err == EPERM || err == EACCES) - die("No permission - are you root?\n"); + die("Permission error - are you root?\n" + "\t Consider tweaking" + " /proc/sys/kernel/perf_event_paranoid.\n"); /* * If it's cycles then fall back to hrtimer * based cpu-clock-tick sw counter, which @@ -1231,7 +1233,7 @@ try_again: goto try_again; } printf("\n"); - error("perfcounter syscall returned with %d (%s)\n", + error("sys_perf_event_open() syscall returned with %d (%s). /bin/dmesg may provide additional information.\n", fd[i][counter][thread_index], strerror(err)); die("No CONFIG_PERF_EVENTS=y kernel support configured?\n"); exit(-1); |