All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=761724

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=8f13fa7e0bf811fb19a46ffd775437a6d85430d3007978ad79bf8d309ddcdc53


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

chromium-rel-mac11
chromium-rel-win10
chromium-rel-win7-dual
chromium-rel-win7-gpu-intel
chromium-rel-win7-gpu-nvidia
chromium-rel-win7-x64-dual
chromium-rel-win8-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8969400381158041392

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

Suspected Commit
  Author : Michael Hablich
  Commit : f165dfdd5cb7d177de36b9fb87922ef19bb6e001
  Date   : Thu Aug 24 07:52:10 2017
  Subject: Revert "[heap] Enable concurrent marking for x86 and x64."

Bisect Details
  Configuration: win_x64_perf_bisect
  Benchmark    : v8.browsing_desktop
  Metric       : v8-gc-incremental-step_sum/browse_media/browse_media_imgur
  Change       : 542.36% | 102.4045 -> 657.806666667

Revision                           Result                  N
chromium@497002                    102.405 +- 46.683       6      good
chromium@497011                    101.603 +- 69.0561      6      good
chromium@497013                    108.187 +- 16.8211      6      good
chromium@497014                    108.383 +- 58.6871      6      good
chromium@497014,v8@f165dfdd5c      679.291 +- 220.921      6      bad       <--
chromium@497014,v8@94e1437f76      645.296 +- 141.691      6      bad
chromium@497014,v8@237f0f3271      609.899 +- 103.871      6      bad
chromium@497015                    613.509 +- 132.242      6      bad
chromium@497019                    646.122 +- 114.796      6      bad
chromium@497035                    640.281 +- 115.794      6      bad
chromium@497068                    657.807 +- 121.06       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 --story-filter=browse.media.imgur v8.browsing_desktop

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8969400381158041392


For feedback, file a bug with component Speed>Bisection