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-rw-r--r--tools/perf/util/evlist.c17
1 files changed, 13 insertions, 4 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index d661f252b891..7847f3885081 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1487,16 +1487,25 @@ int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused,
int perf_evlist__strerror_mmap(struct perf_evlist *evlist, int err, char *buf, size_t size)
{
char sbuf[STRERR_BUFSIZE], *emsg = strerror_r(err, sbuf, sizeof(sbuf));
- int pages_attempted = evlist->mmap_len / 1024, pages_max_per_user;
+ int pages_attempted = evlist->mmap_len / 1024, pages_max_per_user, printed = 0;
switch (err) {
case EPERM:
sysctl__read_int("kernel/perf_event_mlock_kb", &pages_max_per_user);
- scnprintf(buf, size, "Error:\t%s.\n"
+ printed += scnprintf(buf + printed, size - printed,
+ "Error:\t%s.\n"
"Hint:\tCheck /proc/sys/kernel/perf_event_mlock_kb (%d kB) setting.\n"
- "Hint:\tTried using %zd kB.\n"
- "Hint:\tTry using a smaller -m/--mmap-pages value.",
+ "Hint:\tTried using %zd kB.\n",
emsg, pages_max_per_user, pages_attempted);
+
+ if (pages_attempted >= pages_max_per_user) {
+ printed += scnprintf(buf + printed, size - printed,
+ "Hint:\tTry 'sudo sh -c \"echo %d > /proc/sys/kernel/perf_event_mlock_kb\"', or\n",
+ pages_max_per_user + pages_attempted);
+ }
+
+ printed += scnprintf(buf + printed, size - printed,
+ "Hint:\tTry using a smaller -m/--mmap-pages value.");
break;
default:
scnprintf(buf, size, "%s", emsg);