tools/perf/clear_system_cache/clear_system_cache_main.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // A utility to clear the operating system's cache for a file or directory.
   6 //
   7 // USAGE: clear_system_cache [--recurse] <files or directories>
   8
   9 #include <stdio.h>
  10
  11 #include "base/basictypes.h"
  12 #include "base/command_line.h"
  13 #include "base/files/file_enumerator.h"
  14 #include "base/files/file_path.h"
  15 #include "base/files/file_util.h"
  16 #include "base/logging.h"
  17 #include "base/test/test_file_util.h"
  18
  19 void ClearCacheForFile(const base::FilePath& path) {
  20   VLOG(1) << "Clearing " << path.MaybeAsASCII();
  21   base::EvictFileFromSystemCache(path);
  22 }
  23
  24 int main(int argc, const char* argv[]) {
  25   base::CommandLine::Init(argc, argv);
  26   const base::CommandLine& parsed_command_line =
  27       *base::CommandLine::ForCurrentProcess();
  28   bool should_recurse = parsed_command_line.HasSwitch("recurse");
  29   const base::CommandLine::StringVector& args = parsed_command_line.GetArgs();
  30
  31   if (args.size() < 1) {
  32     printf("USAGE: %s [--recurse] <files or directories>\n", argv[0]);
  33     return 1;
  34   }
  35
  36   for (size_t i = 0; i < args.size(); ++i) {
  37     base::FilePath path(args[i]);
  38     if (!base::PathExists(path)) {
  39       LOG(ERROR) << "Couldn't find " << path.MaybeAsASCII();
  40       return 1;
  41     }
  42
  43     if (base::DirectoryExists(path)) {
  44       base::FileEnumerator enumerator(path, should_recurse,
  45                                       base::FileEnumerator::FILES);
  46       for (base::FilePath next = enumerator.Next(); !next.empty();
  47            next = enumerator.Next()) {
  48         ClearCacheForFile(next);
  49       }
  50     } else {
  51       ClearCacheForFile(path);
  52     }
  53   }
  54
  55   return 0;
  56 }