Index: base/trace_event/memory_profiler_allocation_register_posix.cc |
diff --git a/base/trace_event/memory_profiler_allocation_register_posix.cc b/base/trace_event/memory_profiler_allocation_register_posix.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..e2231a84a39c286b33c2fc7af381458f17b25546 |
--- /dev/null |
+++ b/base/trace_event/memory_profiler_allocation_register_posix.cc |
@@ -0,0 +1,59 @@ |
+// Copyright 2015 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#include "base/trace_event/memory_profiler_allocation_register.h" |
+ |
+#include <sys/mman.h> |
+#include <unistd.h> |
+ |
+#include "base/basictypes.h" |
+#include "base/bits.h" |
+#include "base/logging.h" |
+#include "base/process/process_metrics.h" |
+ |
+#ifndef MAP_ANONYMOUS |
+#define MAP_ANONYMOUS MAP_ANON |
+#endif |
+ |
+namespace base { |
+namespace trace_event { |
+ |
+namespace { |
+size_t GetGuardSize() { |
+ return GetPageSize(); |
+} |
+} |
+ |
+// static |
+void* AllocationRegister::AllocateVirtualMemory(size_t size) { |
+ size = bits::Align(size, GetPageSize()); |
+ |
+ // Add space for a guard page at the end. |
+ size_t map_size = size + GetGuardSize(); |
+ |
+ void* addr = mmap(nullptr, map_size, PROT_READ | PROT_WRITE, |
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
+ |
+ PCHECK(addr != MAP_FAILED); |
+ |
+ // Mark the last page of the allocated address space as inaccessible |
+ // (PROT_NONE). The read/write accessible space is still at least |min_size| |
+ // bytes. |
+ void* guard_addr = |
+ reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(addr) + size); |
+ int result = mprotect(guard_addr, GetGuardSize(), PROT_NONE); |
+ PCHECK(result == 0); |
+ |
+ return addr; |
+} |
+ |
+// static |
+void AllocationRegister::FreeVirtualMemory(void* address, |
+ size_t allocated_size) { |
+ size_t size = bits::Align(allocated_size, GetPageSize()) + GetGuardSize(); |
+ munmap(address, size); |
+} |
+ |
+} // namespace trace_event |
+} // namespace base |