tools: perf: Fix typo in tools/perf

Correct spelling typo in tools/perf.

Signed-off-by: Masanari iida <standby24x7@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
index 3bdb407..eb34057 100644
--- a/tools/perf/util/callchain.h
+++ b/tools/perf/util/callchain.h
@@ -58,7 +58,7 @@
 /*
  * A callchain cursor is a single linked list that
  * let one feed a callchain progressively.
- * It keeps persitent allocated entries to minimize
+ * It keeps persistent allocated entries to minimize
  * allocations.
  */
 struct callchain_cursor_node {
diff --git a/tools/perf/util/parse-events-test.c b/tools/perf/util/parse-events-test.c
index 1b997d2..34b97bb 100644
--- a/tools/perf/util/parse-events-test.c
+++ b/tools/perf/util/parse-events-test.c
@@ -752,7 +752,7 @@
 
 	ret = stat(path, &st);
 	if (ret)
-		pr_debug("ommiting PMU cpu tests\n");
+		pr_debug("omitting PMU cpu tests\n");
 	return !ret;
 }
 
diff --git a/tools/perf/util/python-ext-sources b/tools/perf/util/python-ext-sources
index 2884e67..f4e37ce 100644
--- a/tools/perf/util/python-ext-sources
+++ b/tools/perf/util/python-ext-sources
@@ -1,5 +1,5 @@
 #
-# List of files needed by perf python extention
+# List of files needed by perf python extension
 #
 # Each source file must be placed on its own line so that it can be
 # processed by Makefile and util/setup.py accordingly.