metrics/base: log whether drives have seek penalties.

base/sys_info.cc

 // Copyright (c) 2012 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/sys_info.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 35 matching lines @@
 
 // static
 int64 SysInfo::Uptime() {
   // This code relies on an implementation detail of TimeTicks::Now() - that
   // its return value happens to coincide with the system uptime value in
   // microseconds, on Win/Mac/iOS/Linux/ChromeOS and Android.
   int64 uptime_in_microseconds = TimeTicks::Now().ToInternalValue();
   return uptime_in_microseconds / 1000;
 }
 
+#if !defined(OS_WIN)

[rvargas (doing something else), 2015/03/12 22:01:11]

Given that this would have to be modified every time a new platform comes to
life, it seems better to pay the price and copy this to all unsupported
platforms.

[Dan Beam, 2015/03/13 19:31:31]

put into _posix.cc for now, which originally was because I had hoped that i'd
only have to do this once for all posix systems but I'm pretty certain that's
wrong :(

+bool SysInfo::HasSeekPenalty(const FilePath& path, bool* has_seek_penalty) {
+  return false;
+}
+#endif
+
 }  // namespace base