[Telemetry] Combine SysfsPlatformBackend into LinuxBasedPlatformBackend.

tools/telemetry/telemetry/core/platform/proc_supporting_platform_backend.py

Index: tools/telemetry/telemetry/core/platform/proc_supporting_platform_backend.py
diff --git a/tools/telemetry/telemetry/core/platform/proc_supporting_platform_backend.py b/tools/telemetry/telemetry/core/platform/proc_supporting_platform_backend.py
deleted file mode 100644
index 8633b4301eda2b1c5ccbd0d879d1f6cbe9f6244e..0000000000000000000000000000000000000000
--- a/tools/telemetry/telemetry/core/platform/proc_supporting_platform_backend.py
+++ /dev/null
@@ -1,125 +0,0 @@
-# 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.
-
-try:
-  import resource  # pylint: disable=F0401
-except ImportError:
-  resource = None  # Not available on all platforms
-
-from telemetry import decorators
-from telemetry.core import exceptions
-from telemetry.core.platform import platform_backend
-
-
-class ProcSupportingPlatformBackend(platform_backend.PlatformBackend):
-
-  """Represents a platform that supports /proc.
-
-  Subclasses must implement _GetFileContents and _GetPsOutput."""
-
-  def GetSystemCommitCharge(self):
-    meminfo_contents = self._GetFileContents('/proc/meminfo')
-    meminfo = self._GetProcFileDict(meminfo_contents)
-    if not meminfo:
-      return None
-    return (self._ConvertKbToByte(meminfo['MemTotal'])
-            - self._ConvertKbToByte(meminfo['MemFree'])
-            - self._ConvertKbToByte(meminfo['Buffers'])
-            - self._ConvertKbToByte(meminfo['Cached']))
-
-  @decorators.Cache
-  def GetSystemTotalPhysicalMemory(self):
-    meminfo_contents = self._GetFileContents('/proc/meminfo')
-    meminfo = self._GetProcFileDict(meminfo_contents)
-    if not meminfo:
-      return None
-    return self._ConvertKbToByte(meminfo['MemTotal'])
-
-  def GetCpuStats(self, pid):
-    stats = self._GetProcFileForPid(pid, 'stat')
-    if not stats:
-      return {}
-    stats = stats.split()
-    utime = float(stats[13])
-    stime = float(stats[14])
-    cpu_process_jiffies = utime + stime
-    return {'CpuProcessTime': cpu_process_jiffies}
-
-  def GetCpuTimestamp(self):
-    timer_list = self._GetFileContents('/proc/timer_list')
-    total_jiffies = float(self._GetProcJiffies(timer_list))
-    return {'TotalTime': total_jiffies}
-
-  def GetMemoryStats(self, pid):
-    status_contents = self._GetProcFileForPid(pid, 'status')
-    stats = self._GetProcFileForPid(pid, 'stat').split()
-    status = self._GetProcFileDict(status_contents)
-    if not status or not stats or 'Z' in status['State']:
-      return {}
-    vm = int(stats[22])
-    vm_peak = (self._ConvertKbToByte(status['VmPeak'])
-               if 'VmPeak' in status else vm)
-    wss = int(stats[23]) * resource.getpagesize()
-    wss_peak = (self._ConvertKbToByte(status['VmHWM'])
-                if 'VmHWM' in status else wss)
-
-    private_dirty_bytes = 0
-    for line in self._GetProcFileForPid(pid, 'smaps').splitlines():
-      if line.startswith('Private_Dirty:'):
-        private_dirty_bytes += self._ConvertKbToByte(line.split(':')[1].strip())
-
-    return {'VM': vm,
-            'VMPeak': vm_peak,
-            'PrivateDirty': private_dirty_bytes,
-            'WorkingSetSize': wss,
-            'WorkingSetSizePeak': wss_peak}
-
-  def GetIOStats(self, pid):
-    io_contents = self._GetProcFileForPid(pid, 'io')
-    io = self._GetProcFileDict(io_contents)
-    return {'ReadOperationCount': int(io['syscr']),
-            'WriteOperationCount': int(io['syscw']),
-            'ReadTransferCount': int(io['rchar']),
-            'WriteTransferCount': int(io['wchar'])}
-
-  def _GetFileContents(self, filename):
-    raise NotImplementedError()
-
-  def _GetPsOutput(self, columns, pid=None):
-    raise NotImplementedError()
-
-  def _IsPidAlive(self, pid):
-    assert pid, 'pid is required'
-    return bool(self._GetPsOutput(['pid'], pid) == str(pid))
-
-  def _GetProcFileForPid(self, pid, filename):
-    try:
-      return self._GetFileContents('/proc/%s/%s' % (pid, filename))
-    except IOError:
-      if not self._IsPidAlive(pid):
-        raise exceptions.ProcessGoneException()
-      raise
-
-  def _ConvertKbToByte(self, value):
-    return int(value.replace('kB','')) * 1024
-
-  def _GetProcFileDict(self, contents):
-    retval = {}
-    for line in contents.splitlines():
-      key, value = line.split(':')
-      retval[key.strip()] = value.strip()
-    return retval
-
-  def _GetProcJiffies(self, timer_list):
-    """Parse '/proc/timer_list' output and returns the first jiffies attribute.
-
-    Multi-CPU machines will have multiple 'jiffies:' lines, all of which will be
-    essentially the same.  Return the first one."""
-    if isinstance(timer_list, str):
-      timer_list = timer_list.splitlines()
-    for line in timer_list:
-      if line.startswith('jiffies:'):
-        _, value = line.split(':')
-        return value
-    raise Exception('Unable to find jiffies from /proc/timer_list')