Implement the missing memory information functions that memory_test uses.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/266009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@28486 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 57 insertions, 4 deletions

diff --git a/chrome/test/perf/mem_usage_linux.cc b/chrome/test/perf/mem_usage_linux.cc
index 0d3b825..ec18d01 100644
--- a/chrome/test/perf/mem_usage_linux.cc
+++ b/chrome/test/perf/mem_usage_linux.cc
@@ -4,20 +4,73 @@
 
 #include "chrome/test/perf/mem_usage.h"
 
+#include "base/file_util.h"
 #include "base/logging.h"
+#include "base/process_util.h"
+#include "base/string_util.h"
+
+namespace {
+
+// The format of /proc/meminfo is:
+//
+// MemTotal:      8235324 kB
+// MemFree:       1628304 kB
+// Buffers:        429596 kB
+// Cached:        4728232 kB
+// ...
+const size_t kMemTotalIndex = 1;
+const size_t kMemFreeIndex = 4;
+const size_t kMemBuffersIndex = 7;
+const size_t kMemCacheIndex = 10;
+
+}  // namespace
 
 bool GetMemoryInfo(uint32 process_id,
                    size_t* peak_virtual_size,
                    size_t* current_virtual_size,
                    size_t* peak_working_set_size,
                    size_t* current_working_set_size) {
-  NOTIMPLEMENTED();
-  return false;
+  if (!peak_virtual_size || !current_virtual_size)
+    return false;
+
+  base::ProcessMetrics* metrics =
+      base::ProcessMetrics::CreateProcessMetrics(process_id);
+  *peak_virtual_size = metrics->GetPeakPagefileUsage();
+  *current_virtual_size = metrics->GetPagefileUsage();
+  *peak_working_set_size = metrics->GetPeakWorkingSetSize();
+  *current_working_set_size = metrics->GetWorkingSetSize();
+  delete metrics;
+
+  return true;
 }
 
 size_t GetSystemCommitCharge() {
-  NOTIMPLEMENTED();
-  return 0;
+  // Used memory is: total - free - buffers - caches
+  FilePath meminfo_file("/proc/meminfo");
+  std::string meminfo_data;
+  if (!file_util::ReadFileToString(meminfo_file, &meminfo_data))
+    return 0;
+  std::vector<std::string> meminfo_fields;
+  SplitStringAlongWhitespace(meminfo_data, &meminfo_fields);
+
+  if (meminfo_fields.size() < kMemCacheIndex) {
+    LOG(ERROR) << "Failed to parse /proc/meminfo.  Only found " <<
+      meminfo_fields.size() << " fields.";
+    return 0;
+  }
+
+  DCHECK_EQ(meminfo_fields[kMemTotalIndex-1], "MemTotal:");
+  DCHECK_EQ(meminfo_fields[kMemFreeIndex-1], "MemFree:");
+  DCHECK_EQ(meminfo_fields[kMemBuffersIndex-1], "Buffers:");
+  DCHECK_EQ(meminfo_fields[kMemCacheIndex-1], "Cached:");
+
+  int result_in_kb;
+  result_in_kb = StringToInt(meminfo_fields[kMemTotalIndex]);
+  result_in_kb -= StringToInt(meminfo_fields[kMemFreeIndex]);
+  result_in_kb -= StringToInt(meminfo_fields[kMemBuffersIndex]);
+  result_in_kb -= StringToInt(meminfo_fields[kMemCacheIndex]);
+
+  return result_in_kb * 1024;
 }
 
 void PrintChromeMemoryUsageInfo() {