All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=751990

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=6d159ff12ec287b3d31440e5ca6f78e6a16cfa294a602be9a7a735f7a4973ed5


Bot(s) for this bug's original alert(s):

android-nexus5
chromium-rel-win7-gpu-intel
chromium-rel-win7-gpu-nvidia
chromium-rel-win7-x64-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8972297536344843280

=== BISECT JOB RESULTS ===
Perf regression found with culprit

Suspected Commit
  Author : Ulan Degenbaev
  Commit : 2cc8fdfb47226101b958da465d64803368fb7c76
  Date   : Thu Jul 27 11:09:24 2017
  Subject: [heap] Re-implement weak cell tracking in the marker.

Bisect Details
  Configuration: winx64intel_perf_bisect
  Benchmark    : memory.long_running_idle_gmail_background_tbmv2
  Metric       : v8-gc-incremental-finalize_avg/v8-gc-incremental-finalize_avg
  Change       : 88.60% | 1.30982460317 -> 0.14935342366

Revision                           Result                      N
chromium@490004                    1.30982 +- 1.84764          6      good
chromium@490020                    0.870342 +- 0.296232        5      good
chromium@490024                    1.15496 +- 0.801648         6      good
chromium@490026                    1.07333 +- 0.514623         6      good
chromium@490027                    0.961969 +- 0.699217        6      good
chromium@490027,v8@2cc8fdfb47      0.168473 +- 0.236465        6      bad       <--
chromium@490027,v8@6a75fcd4df      0.128033 +- 0.173365        6      bad
chromium@490027,v8@e4bbf92be3      0.17175 +- 0.372324         6      bad
chromium@490027,v8@9836cdb1ad      0.0752561 +- 0.0151891      6      bad
chromium@490028                    0.10045 +- 0.134769         6      bad
chromium@490036                    0.159139 +- 0.308208        6      bad
chromium@490067                    0.149353 +- 0.268479        6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release_x64 --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests memory.long_running_idle_gmail_background_tbmv2

More information on addressing performance regressions:
  http://g.co/ChromePerformanceRegressions

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8972297536344843280


For feedback, file a bug with component Speed>Bisection