All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=787432

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=6d4356ffe44951d5d31f06db8045c1f14dfb9bbc8df6c50ae838f0b83df5103e


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

chromium-rel-mac-retina
chromium-rel-mac11
chromium-rel-mac11-air
chromium-rel-mac12
chromium-rel-win10
chromium-rel-win7-dual
chromium-rel-win7-gpu-ati
chromium-rel-win7-gpu-intel
chromium-rel-win7-gpu-nvidia
chromium-rel-win7-x64-dual
chromium-rel-win8-dual
linux-release
win-high-dpi

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8962312574233434208

=== 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: win_x64_perf_bisect
  Benchmark    : v8.browsing_desktop
  Metric       : v8-gc-incremental-step_max/browse_social/browse_social_facebook_infinite_scroll
  Change       : 52.81% | 1.81211111111 -> 2.769

Revision                           Result                   N
chromium@514531                    1.81211 +- 1.22285       9       good
chromium@514597                    1.79144 +- 1.63832       9       good
chromium@514630                    1.59071 +- 0.779278      14      good
chromium@514638                    1.80029 +- 2.44347       21      good
chromium@514641                    1.69689 +- 0.714961      9       good
chromium@514641,v8@67d543ec31      1.73836 +- 1.35314       14      good
chromium@514641,v8@6bb1d47e6e      2.4015 +- 1.30022        6       bad       <--
chromium@514641,v8@ac0661b358      2.47043 +- 2.18282       14      bad
chromium@514641,v8@80cb266c75      2.538 +- 1.68048         9       bad
chromium@514642                    2.28714 +- 1.90432       14      bad
chromium@514643                    2.29329 +- 2.30894       21      bad
chromium@514647                    2.38979 +- 1.94607       14      bad
chromium@514663                    2.769 +- 1.43176         9       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.social.facebook.infinite.scroll 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/8962312574233434208


For feedback, file a bug with component Speed>Bisection