[telemetry] Drop data for sysfs power monitor if distribution changes but total does not.

[telemetry] Drop data for sysfs power monitor if distribution changes but total does not.

The log showed that the sum across all C-states didn't change, but C0 went down and WFI went up. AFAIK it shouldn't be possible for any of them to go down, so we'll just drop the data in this case.

BUG=426430
TEST=None.
TBR=tonyg

Committed: https://crrev.com/3598d35dced5eb1bd2f061c9a576a442c4c24cbf
Cr-Commit-Position: refs/heads/master@{#302492}

[dtu, 2014-10-31 21:22:57]

dtu@chromium.org changed reviewers:
+ tonyg@chromium.org

[Andrew Hayden (chromium.org), 2014-11-03 12:22:39]

andrewhayden@chromium.org changed reviewers:
+ andrewhayden@chromium.org

[Andrew Hayden (chromium.org), 2014-11-03 12:22:39]

LGTM

https://codereview.chromium.org/679813002/diff/20001/tools/telemetry/telemetr...
File
tools/telemetry/telemetry/core/platform/power_monitor/sysfs_power_monitor.py
(right):

https://codereview.chromium.org/679813002/diff/20001/tools/telemetry/telemetr...
tools/telemetry/telemetry/core/platform/power_monitor/sysfs_power_monitor.py:173:
if total == 0:
Please add a comment here linking back to
https://code.google.com/p/chromium/issues/detail?id=426430 for the explanation
of how this can be zero.

[dtu, 2014-11-03 20:19:00]

TBRing to greenify

https://codereview.chromium.org/679813002/diff/20001/tools/telemetry/telemetr...
File
tools/telemetry/telemetry/core/platform/power_monitor/sysfs_power_monitor.py
(right):

https://codereview.chromium.org/679813002/diff/20001/tools/telemetry/telemetr...
tools/telemetry/telemetry/core/platform/power_monitor/sysfs_power_monitor.py:173:
if total == 0:
On 2014/11/03 12:22:39, Andrew Hayden wrote:
> Please add a comment here linking back to
> https://code.google.com/p/chromium/issues/detail?id=426430 for the explanation
> of how this can be zero.

Done.

[dtu, 2014-11-03 20:19:03]

The CQ bit was checked by dtu@chromium.org

[commit-bot: I haz the power, 2014-11-03 20:19:27]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/679813002/40001

[commit-bot: I haz the power, 2014-11-03 21:52:15]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2014-11-03 21:52:41]

Patchset 3 (id:??) landed as
https://crrev.com/3598d35dced5eb1bd2f061c9a576a442c4c24cbf
Cr-Commit-Position: refs/heads/master@{#302492}