All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=783677

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=bb762ff2fc24d3987a9929f072e4fc6f4c2b5bce5145425335ac40261a82397b


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

android-webview-nexus5X
chromium-rel-win10
chromium-rel-win7-gpu-ati
chromium-rel-win8-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8963319824261745184

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

Suspected Commit
  Author : Ulan Degenbaev
  Commit : 6bb1d47e6e82f75ead36cdab209afc5dafa8329c
  Date   : Tue Nov 07 13:11:10 2017
  Subject: [heap] Re-enable concurrent marking.

Bisect Details
  Configuration: winx64_10_perf_bisect
  Benchmark    : memory.long_running_idle_gmail_tbmv2
  Metric       : v8-gc-total_avg/v8-gc-total_avg
  Change       : 70.48% | 0.501627351746 -> 0.855180649494

Revision                           Result                     N
chromium@514641                    0.501627 +- 0.0375986      6      good
chromium@514641,v8@67d543ec31      0.493313 +- 0.0325516      6      good
chromium@514641,v8@6bb1d47e6e      0.879612 +- 0.0741499      6      bad       <--
chromium@514641,v8@ac0661b358      0.88913 +- 0.0470991       6      bad
chromium@514641,v8@80cb266c75      0.861843 +- 0.0868183      6      bad
chromium@514642                    0.884224 +- 0.070707       6      bad
chromium@514643                    0.891781 +- 0.0393388      6      bad
chromium@514644                    0.867527 +- 0.0829828      6      bad
chromium@514647                    0.851422 +- 0.154134       6      bad
chromium@514653                    0.880142 +- 0.0715671      6      bad
chromium@514665                    0.874912 +- 0.0765925      6      bad
chromium@514688                    0.860226 +- 0.0839114      6      bad
chromium@514734                    0.855181 +- 0.104701       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_tbmv2

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8963319824261745184


For feedback, file a bug with component Speed>Bisection