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// Copyright (c) 2008 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/process_util.h"
#include <string>
#include "base/file_util.h"
#include "base/logging.h"
#include "base/string_tokenizer.h"
#include "base/string_util.h"
namespace {
enum ParsingState {
KEY_NAME,
KEY_VALUE
};
} // namespace
namespace process_util {
// To have /proc/self/io file you must enable CONFIG_TASK_IO_ACCOUNTING
// in your kernel configuration.
bool ProcessMetrics::GetIOCounters(IoCounters* io_counters) {
std::string proc_io_contents;
if (!file_util::ReadFileToString(L"/proc/self/io", &proc_io_contents))
return false;
(*io_counters).OtherOperationCount = 0;
(*io_counters).OtherTransferCount = 0;
StringTokenizer tokenizer(proc_io_contents, ": \n");
ParsingState state = KEY_NAME;
std::string last_key_name;
while (tokenizer.GetNext()) {
switch (state) {
case KEY_NAME:
last_key_name = tokenizer.token();
state = KEY_VALUE;
break;
case KEY_VALUE:
DCHECK(!last_key_name.empty());
if (last_key_name == "syscr") {
(*io_counters).ReadOperationCount = StringToInt64(tokenizer.token());
} else if (last_key_name == "syscw") {
(*io_counters).WriteOperationCount = StringToInt64(tokenizer.token());
} else if (last_key_name == "rchar") {
(*io_counters).ReadTransferCount = StringToInt64(tokenizer.token());
} else if (last_key_name == "wchar") {
(*io_counters).WriteTransferCount = StringToInt64(tokenizer.token());
}
state = KEY_NAME;
break;
}
}
return true;
}
} // namespace process_util
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