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);