From d92946b2e86b3c9bc78f9ad25c5bfe15aef0f661 Mon Sep 17 00:00:00 2001
From: jcoomes <unknown>
Date: Wed, 17 Aug 2011 10:32:53 -0700
Subject: [PATCH] 6791672: enable 1G and larger pages on solaris Reviewed-by:
 ysr, iveresov, johnc

---
 src/os/solaris/vm/os_solaris.cpp | 29 ++++++++++++++++++-----------
 src/share/vm/runtime/os.cpp      | 11 +++++++++++
 src/share/vm/runtime/os.hpp      |  4 +++-
 3 files changed, 32 insertions(+), 12 deletions(-)

diff --git a/src/os/solaris/vm/os_solaris.cpp b/src/os/solaris/vm/os_solaris.cpp
index 3280040da..4fa64a284 100644
--- a/src/os/solaris/vm/os_solaris.cpp
+++ b/src/os/solaris/vm/os_solaris.cpp
@@ -3252,7 +3252,6 @@ bool os::unguard_memory(char* addr, size_t bytes) {
 //                                 supported Solaris versions, this combination
 //                                 is equivalent to +UseISM -UseMPSS.
 
-typedef int (*getpagesizes_func_type) (size_t[], int);
 static size_t _large_page_size = 0;
 
 bool os::Solaris::ism_sanity_check(bool warn, size_t * page_size) {
@@ -3284,23 +3283,29 @@ static void insertion_sort_descending(size_t* array, int len) {
 }
 
 bool os::Solaris::mpss_sanity_check(bool warn, size_t * page_size) {
-  getpagesizes_func_type getpagesizes_func =
-    CAST_TO_FN_PTR(getpagesizes_func_type, dlsym(RTLD_DEFAULT, "getpagesizes"));
-  if (getpagesizes_func == NULL) {
-    if (warn) {
-      warning("MPSS is not supported by the operating system.");
-    }
-    return false;
-  }
-
   const unsigned int usable_count = VM_Version::page_size_count();
   if (usable_count == 1) {
     return false;
   }
 
+  // Find the right getpagesizes interface.  When solaris 11 is the minimum
+  // build platform, getpagesizes() (without the '2') can be called directly.
+  typedef int (*gps_t)(size_t[], int);
+  gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2"));
+  if (gps_func == NULL) {
+    gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes"));
+    if (gps_func == NULL) {
+      if (warn) {
+        warning("MPSS is not supported by the operating system.");
+      }
+      return false;
+    }
+  }
+
   // Fill the array of page sizes.
-  int n = getpagesizes_func(_page_sizes, page_sizes_max);
+  int n = (*gps_func)(_page_sizes, page_sizes_max);
   assert(n > 0, "Solaris bug?");
+
   if (n == page_sizes_max) {
     // Add a sentinel value (necessary only if the array was completely filled
     // since it is static (zeroed at initialization)).
@@ -3308,6 +3313,7 @@ bool os::Solaris::mpss_sanity_check(bool warn, size_t * page_size) {
     DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");)
   }
   assert(_page_sizes[n] == 0, "missing sentinel");
+  trace_page_sizes("available page sizes", _page_sizes, n);
 
   if (n == 1) return false;     // Only one page size available.
 
@@ -3337,6 +3343,7 @@ bool os::Solaris::mpss_sanity_check(bool warn, size_t * page_size) {
   }
   *page_size = _page_sizes[0];
 
+  trace_page_sizes("usable page sizes", _page_sizes, end + 1);
   return true;
 }
 
diff --git a/src/share/vm/runtime/os.cpp b/src/share/vm/runtime/os.cpp
index 5da110807..aa3fbdb32 100644
--- a/src/share/vm/runtime/os.cpp
+++ b/src/share/vm/runtime/os.cpp
@@ -1232,6 +1232,17 @@ size_t os::page_size_for_region(size_t region_min_size, size_t region_max_size,
 }
 
 #ifndef PRODUCT
+void os::trace_page_sizes(const char* str, const size_t* page_sizes, int count)
+{
+  if (TracePageSizes) {
+    tty->print("%s: ", str);
+    for (int i = 0; i < count; ++i) {
+      tty->print(" " SIZE_FORMAT, page_sizes[i]);
+    }
+    tty->cr();
+  }
+}
+
 void os::trace_page_sizes(const char* str, const size_t region_min_size,
                           const size_t region_max_size, const size_t page_size,
                           const char* base, const size_t size)
diff --git a/src/share/vm/runtime/os.hpp b/src/share/vm/runtime/os.hpp
index 0b401b1f8..b43100d1f 100644
--- a/src/share/vm/runtime/os.hpp
+++ b/src/share/vm/runtime/os.hpp
@@ -208,11 +208,13 @@ class os: AllStatic {
                                      size_t region_max_size,
                                      uint min_pages);
 
-  // Method for tracing page sizes returned by the above method; enabled by
+  // Methods for tracing page sizes returned by the above method; enabled by
   // TracePageSizes.  The region_{min,max}_size parameters should be the values
   // passed to page_size_for_region() and page_size should be the result of that
   // call.  The (optional) base and size parameters should come from the
   // ReservedSpace base() and size() methods.
+  static void trace_page_sizes(const char* str, const size_t* page_sizes,
+                               int count) PRODUCT_RETURN;
   static void trace_page_sizes(const char* str, const size_t region_min_size,
                                const size_t region_max_size,
                                const size_t page_size,
-- 
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