From db960a8bba81df3217660ec5a96d73e0d6baa01b Mon Sep 17 00:00:00 2001
From: Kenneth Heafield <github@kheafield.com>
Date: Wed, 24 Apr 2013 10:12:41 +0100
Subject: KenLM 0831569c3137536165b107c6841603c725dfa2b1

---
 klm/util/mmap.cc | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

(limited to 'klm/util/mmap.cc')

diff --git a/klm/util/mmap.cc b/klm/util/mmap.cc
index bc9e3f81..6f79f26f 100644
--- a/klm/util/mmap.cc
+++ b/klm/util/mmap.cc
@@ -6,6 +6,7 @@
 
 #include "util/exception.hh"
 #include "util/file.hh"
+#include "util/scoped.hh"
 
 #include <iostream>
 
@@ -110,8 +111,14 @@ void *MapOrThrow(std::size_t size, bool for_write, int flags, bool prefault, int
   UTIL_THROW_IF(!ret, ErrnoException, "MapViewOfFile failed");
 #else
   int protect = for_write ? (PROT_READ | PROT_WRITE) : PROT_READ;
-  void *ret = mmap(NULL, size, protect, flags, fd, offset);
-  UTIL_THROW_IF(ret == MAP_FAILED, ErrnoException, "mmap failed for size " << size << " at offset " << offset);
+  void *ret;
+  UTIL_THROW_IF((ret = mmap(NULL, size, protect, flags, fd, offset)) == MAP_FAILED, ErrnoException, "mmap failed for size " << size << " at offset " << offset);
+#  ifdef MADV_HUGEPAGE
+  /* We like huge pages but it's fine if we can't have them.  Note that huge
+   * pages are not supported for file-backed mmap on linux.
+   */
+  madvise(ret, size, MADV_HUGEPAGE);
+#  endif
 #endif
   return ret;
 }
@@ -141,8 +148,7 @@ void MapRead(LoadMethod method, int fd, uint64_t offset, std::size_t size, scope
     case POPULATE_OR_READ:
 #endif
     case READ:
-      out.reset(malloc(size), size, scoped_memory::MALLOC_ALLOCATED);
-      if (!out.get()) UTIL_THROW(util::ErrnoException, "Allocating " << size << " bytes with malloc");
+      out.reset(MallocOrThrow(size), size, scoped_memory::MALLOC_ALLOCATED);
       SeekOrThrow(fd, offset);
       ReadOrThrow(fd, out.get(), size);
       break;
-- 
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