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-rw-r--r--tools/perf/util/evlist.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index cfbe2b99b9aa..bb5dfc5d1e75 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -8,6 +8,7 @@
*/
#include "util.h"
#include <api/fs/debugfs.h>
+#include <api/fs/fs.h>
#include <poll.h>
#include "cpumap.h"
#include "thread_map.h"
@@ -1483,6 +1484,28 @@ int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused,
return 0;
}
+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 value;
+
+ switch (err) {
+ case EPERM:
+ sysctl__read_int("kernel/perf_event_mlock_kb", &value);
+ scnprintf(buf, size, "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 bigger -m/--mmap-pages value.",
+ emsg, value, evlist->mmap_len / 1024);
+ break;
+ default:
+ scnprintf(buf, size, "%s", emsg);
+ break;
+ }
+
+ return 0;
+}
+
void perf_evlist__to_front(struct perf_evlist *evlist,
struct perf_evsel *move_evsel)
{