All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=783631

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=9fb48991f9f27fb2ae8a4b6d344c2af4ce26e35c20a1625be4f2821240d25f10


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

android-nexus5X
android-nexus6
chromium-rel-mac12-mini-8gb
chromium-rel-win7-gpu-ati
chromium-rel-win7-x64-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8963323491128470384

=== 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: android_nexus5X_perf_bisect
  Benchmark    : memory.long_running_idle_gmail_tbmv2
  Metric       : v8-gc-total_avg/v8-gc-total_avg
  Change       : 63.54% | 0.851484844656 -> 1.39250796227

Revision                           Result                     N
chromium@514561                    0.851485 +- 0.0500253      6      good
chromium@514614                    0.866923 +- 0.0543695      6      good
chromium@514640                    0.85525 +- 0.0285437       6      good
chromium@514641                    0.869436 +- 0.078759       6      good
chromium@514641,v8@67d543ec31      0.853448 +- 0.0682556      6      good
chromium@514641,v8@6bb1d47e6e      1.42999 +- 0.310204        6      bad       <--
chromium@514641,v8@ac0661b358      1.39873 +- 0.372525        6      bad
chromium@514641,v8@80cb266c75      1.31794 +- 0.245027        6      bad
chromium@514642                    1.41765 +- 0.302357        6      bad
chromium@514644                    1.42576 +- 0.42135         6      bad
chromium@514647                    1.36994 +- 0.218389        6      bad
chromium@514653                    1.42545 +- 0.345499        6      bad
chromium@514666                    1.30793 +- 0.407555        6      bad
chromium@514771                    1.39251 +- 0.215895        6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=android-chromium --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/8963323491128470384


For feedback, file a bug with component Speed>Bisection