changeset 52657:533b02f7842c

8213927: G1 ignores AlwaysPreTouch when UseTransparentHugePages is enabled Summary: With UseTransparentHugePages we always need to pretouch on small page size as the underlying memory could currently be allocated as either small or large pages. Reviewed-by: shade, sjohanss
author tschatzl
date Thu, 22 Nov 2018 09:26:51 +0100
parents 11b97acc9c7f
children 2d18e5ed0f8d
files src/hotspot/share/gc/g1/g1PageBasedVirtualSpace.cpp
diffstat 1 files changed, 7 insertions(+), 2 deletions(-) [+]
line wrap: on
line diff
--- a/src/hotspot/share/gc/g1/g1PageBasedVirtualSpace.cpp	Thu Nov 22 09:25:19 2018 +0100
+++ b/src/hotspot/share/gc/g1/g1PageBasedVirtualSpace.cpp	Thu Nov 22 09:26:51 2018 +0100
@@ -232,14 +232,19 @@
   char* volatile _cur_addr;
   char* const _start_addr;
   char* const _end_addr;
-  size_t const _page_size;
+  size_t _page_size;
 public:
   G1PretouchTask(char* start_address, char* end_address, size_t page_size) :
     AbstractGangTask("G1 PreTouch"),
     _cur_addr(start_address),
     _start_addr(start_address),
     _end_addr(end_address),
-    _page_size(page_size) {
+    _page_size(0) {
+#ifdef LINUX
+    _page_size = UseTransparentHugePages ? (size_t)os::vm_page_size(): page_size;
+#else
+    _page_size = page_size;
+#endif
   }
 
   virtual void work(uint worker_id) {