Purge unpinned ashmem before parsing /proc/$pid/smaps.

This will help stabilize memory measurements so that memory regressions can't
be hidden when unpinned ashmem gets purged by the kernel.

BUG=311633

Review URL: https://codereview.chromium.org/52833002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@235115 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 56 insertions, 1 deletions

diff --git a/tools/android/android_tools.gyp b/tools/android/android_tools.gyp
index 6bad985..ed5e905 100644
--- a/tools/android/android_tools.gyp
+++ b/tools/android/android_tools.gyp
@@ -10,9 +10,10 @@
       'target_name': 'android_tools',
       'type': 'none',
       'dependencies': [
+        'adb_reboot/adb_reboot.gyp:adb_reboot',
         'forwarder2/forwarder.gyp:forwarder2',
         'md5sum/md5sum.gyp:md5sum',
-        'adb_reboot/adb_reboot.gyp:adb_reboot',
+        'purge_ashmem/purge_ashmem.gyp:purge_ashmem',
       ],
     },
     {
diff --git a/tools/android/purge_ashmem/purge_ashmem.c b/tools/android/purge_ashmem/purge_ashmem.c
new file mode 100644
index 0000000..0de582d
--- /dev/null
+++ b/tools/android/purge_ashmem/purge_ashmem.c
@@ -0,0 +1,20 @@
+// Copyright 2013 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 <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "third_party/ashmem/ashmem.h"
+
+int main(void) {
+  const int pages_purged = ashmem_purge_all();
+  if (pages_purged < 0) {
+    perror("ashmem_purge_all");
+    return EXIT_FAILURE;
+  }
+  printf("Purged %d pages (%d KBytes)\n",
+         pages_purged, pages_purged * getpagesize() / 1024);
+  return EXIT_SUCCESS;
+}
diff --git a/tools/android/purge_ashmem/purge_ashmem.gyp b/tools/android/purge_ashmem/purge_ashmem.gyp
new file mode 100644
index 0000000..842d756
--- /dev/null
+++ b/tools/android/purge_ashmem/purge_ashmem.gyp
@@ -0,0 +1,34 @@
+# Copyright 2013 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.
+
+{
+  'targets': [
+    {
+      'target_name': 'purge_ashmem',
+      'type': 'executable',
+      'dependencies': [
+        '../../../third_party/ashmem/ashmem.gyp:ashmem',
+      ],
+      'include_dirs': [
+        '../../../',
+      ],
+      'conditions': [
+        # Warning: A PIE tool cannot run on ICS 4.0.4, so only
+        #          build it as position-independent when ASAN
+        #          is activated. See b/6587214 for details.
+        [ 'asan==1', {
+          'cflags': [
+            '-fPIE',
+          ],
+          'ldflags': [
+            '-pie',
+          ],
+        }],
+      ],
+      'sources': [
+        'purge_ashmem.c',
+      ],
+    },
+  ],
+}