src: large page support for macOS

configure.py

@@ -1037,16 +1037,18 @@ def configure_node(o):
   else:
     o['variables']['node_use_dtrace'] = 'false'
 
-  if options.node_use_large_pages and not flavor in ('linux', 'freebsd'):
+  if options.node_use_large_pages and not flavor in ('linux', 'freebsd', 'mac'):
     raise Exception(
-      'Large pages are supported only on Linux Systems.')
-  if options.node_use_large_pages and flavor in ('linux', 'freebsd'):
+      'Large pages are supported only on Linux, FreeBSD and MacOS Systems.')
+  if options.node_use_large_pages and flavor in ('linux', 'freebsd', 'mac'):
     if options.shared or options.enable_static:
       raise Exception(
         'Large pages are supported only while creating node executable.')
     if target_arch!="x64":
       raise Exception(
         'Large pages are supported only x64 platform.')
+    if flavor == 'mac':
+      print("macOS server with 32GB or more is recommended")
     if flavor == 'linux':
       # Example full version string: 2.6.32-696.28.1.el6.x86_64
       FULL_KERNEL_VERSION=os.uname()[2]

node.gyp

@@ -817,7 +817,7 @@
             }],
           ],
         }],
-        [ 'node_use_large_pages=="true" and OS in "linux freebsd"', {
+        [ 'node_use_large_pages=="true" and OS in "linux freebsd mac"', {
           'defines': [ 'NODE_ENABLE_LARGE_CODE_PAGES=1' ],
           # The current implementation of Large Pages is under Linux.
           # Other implementations are possible but not currently supported.

src/large_pages/node_large_page.cc

@@ -30,6 +30,8 @@
 #if defined(__FreeBSD__)
 #include <sys/sysctl.h>
 #include <sys/user.h>
+#elif defined(__APPLE__)
+#include <mach/vm_map.h>
 #endif
 #include <unistd.h>  // readlink
 
@@ -212,6 +214,42 @@ static struct text_region FindNodeTextRegion() {
     }
     start += cursz;
   }
+#elif defined(__APPLE__)
+  struct text_region nregion;
+  nregion.found_text_region = false;
+  struct vm_region_submap_info_64 map;
+  mach_msg_type_number_t count = VM_REGION_SUBMAP_INFO_COUNT_64;
+  vm_address_t addr = 0UL;
+  vm_size_t size = 0;
+  natural_t depth = 1;
+
+  while (true) {
+    if (vm_region_recurse_64(mach_task_self(), &addr, &size, &depth,
+                             reinterpret_cast<vm_region_info_64_t>(&map),
+                             &count) != KERN_SUCCESS) {
+      break;
+    }
+
+    if (map.is_submap) {
+      depth++;
+    } else {
+      char* start = reinterpret_cast<char*>(hugepage_align_up(addr));
+      char* end = reinterpret_cast<char*>(hugepage_align_down(addr+size));
+      size_t esize = end - start;
+
+      if (end > start && (map.protection & VM_PROT_READ) != 0 &&
+          (map.protection & VM_PROT_EXECUTE) != 0) {
+        nregion.found_text_region = true;
+        nregion.from = start;
+        nregion.to = end;
+        nregion.total_hugepages = esize / hps;
+        break;
+      }
+
+      addr += size;
+      size = 0;
+    }
+  }
 #endif
   return nregion;
 }
@@ -271,7 +309,11 @@ static bool IsSuperPagesEnabled() {
 // c. madvise with MADV_HUGE_PAGE
 // d. If successful copy the code there and unmap the original region
 int
+#if !defined(__APPLE__)
 __attribute__((__section__(".lpstub")))
+#else
+__attribute__((__section__("__TEXT,__lpstub")))
+#endif
 __attribute__((__aligned__(hps)))
 __attribute__((__noinline__))
 MoveTextRegionToLargePages(const text_region& r) {
@@ -330,6 +372,16 @@ MoveTextRegionToLargePages(const text_region& r) {
     munmap(nmem, size);
     return -1;
   }
+#elif defined(__APPLE__)
+  tmem = mmap(start, size,
+              PROT_READ | PROT_WRITE | PROT_EXEC,
+              MAP_PRIVATE | MAP_ANONYMOUS,
+              VM_FLAGS_SUPERPAGE_SIZE_2MB, 0);
+  if (tmem == MAP_FAILED) {
+    PrintSystemError(errno);
+    munmap(nmem, size);
+    return -1;
+  }
 #endif
 
   memcpy(start, nmem, size);
@@ -369,16 +421,19 @@ int MapStaticCodeToLargePages() {
     return MoveTextRegionToLargePages(r);
 
   return -1;
-#elif defined(__FreeBSD__)
+#elif defined(__FreeBSD__) || defined(__APPLE__)
   return MoveTextRegionToLargePages(r);
 #endif
 }
 
 bool IsLargePagesEnabled() {
 #if defined(__linux__)
   return IsTransparentHugePagesEnabled();
-#else
+#elif defined(__FreeBSD__)
   return IsSuperPagesEnabled();
+#elif defined(__APPLE__)
+  // pse-36 flag is present in recent mac x64 products.
+  return true;
 #endif
 }