diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 13241be7df4..7b73b92759e 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,9 @@
+2017-05-12  Andi Kleen  <ak@linux.intel.com>
+
+	PR testsuite/77684
+	* lib/target-supports.exp (profopt-perf-wrapper):
+	Add -m8 option to increase parallelism.
+
 2017-05-12  Thomas Schwinge  <thomas@codesourcery.com>
 
 	* c-c++-common/goacc/parallel-dims-1.c: New file.
diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index 83e7f2670e6..ded6383cc1f 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -522,9 +522,16 @@ proc check_effective_target_keeps_null_pointer_checks { } {
 
 # Return the autofdo profile wrapper
 
+# Linux by default allows 516KB of perf event buffers
+# in /proc/sys/kernel/perf_event_mlock_kb
+# Each individual perf tries to grab it
+# This causes problems with parallel test suite runs. Instead
+# limit us to 8 pages (32K), which should be good enough
+# for the small test programs. With the default settings 
+# this allows parallelism of 16 and higher of parallel gcc-auto-profile
 proc profopt-perf-wrapper { } {
     global srcdir
-    return "$srcdir/../config/i386/gcc-auto-profile -o perf.data "
+    return "$srcdir/../config/i386/gcc-auto-profile -o perf.data -m8 "
 }
 
 # Return true if profiling is supported on the target.