perf trace: Provide a better explanation when mmap fails
If we ask for a mmap lenght than the max configured via the relevant
sysctl, provide a better warning, instead of just expanding the EPERM
returned:
[acme@ssdandy ~]$ trace -m 256 -e nanosleep sleep 2
Error: Operation not permitted.
Hint: Check /proc/sys/kernel/perf_event_mlock_kb (516 kB) setting.
Hint: Tried using 1028 kB.
Hint: Try using a bigger -m/--mmap-pages value.
[acme@ssdandy ~]$ trace -m 128 -e nanosleep sleep 2
2001.280 (2000.403 ms): nanosleep(rqtp: 0x7fff89a8a7f0) = 0
[acme@ssdandy ~]$
An upcoming patch will autotune the request for non-root users when -m
is not used.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-cdvxfz2gycetbkopm9sna1qp@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 83a4835..327541e 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -2045,7 +2045,6 @@
unsigned long before;
const bool forks = argc > 0;
bool draining = false;
- char sbuf[STRERR_BUFSIZE];
trace->live = true;
@@ -2106,11 +2105,8 @@
goto out_error_open;
err = perf_evlist__mmap(evlist, trace->opts.mmap_pages, false);
- if (err < 0) {
- fprintf(trace->output, "Couldn't mmap the events: %s\n",
- strerror_r(errno, sbuf, sizeof(sbuf)));
- goto out_delete_evlist;
- }
+ if (err < 0)
+ goto out_error_mmap;
perf_evlist__enable(evlist);
@@ -2210,6 +2206,10 @@
perf_evlist__strerror_tp(evlist, errno, errbuf, sizeof(errbuf));
goto out_error;
+out_error_mmap:
+ perf_evlist__strerror_mmap(evlist, errno, errbuf, sizeof(errbuf));
+ goto out_error;
+
out_error_open:
perf_evlist__strerror_open(evlist, errno, errbuf, sizeof(errbuf));