All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=768155

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=e168f5d9d771457ddfa393cb64a59b5d50c590010abae2a53954f5eb13ec7cc3


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

chromium-rel-mac11

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8967653747705960768

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

Suspected Commit
  Author : Ulan Degenbaev
  Commit : a76d0a771e430dbc8716624febc549aede738d96
  Date   : Thu Sep 21 12:35:10 2017
  Subject: Reland "[heap] Enable concurrent marking for x86 and x64."

Bisect Details
  Configuration: mac_10_11_perf_bisect
  Benchmark    : oortonline_tbmv2
  Metric       : memory:chrome:renderer_processes:reported_by_chrome:v8:heap:effective_size_max/http___oortonline.gl__run
  Change       : 7.45% | 372443676.0 -> 400197504.0

Revision                           Result                     N
chromium@503421                    372443676 +- 1179943       6      good
chromium@503458                    372630948 +- 151065        6      good
chromium@503476                    372194613 +- 1605290       6      good
chromium@503485                    372431588 +- 1395740       6      good
chromium@503490                    372692324 +- 97685.6       6      good
chromium@503491                    372476287 +- 1000863       6      good
chromium@503491,v8@2857dab5cb      372668033 +- 214570        6      good
chromium@503491,v8@a76d0a771e      402039501 +- 10116050      6      bad       <--
chromium@503492                    403838489 +- 14862039      6      bad
chromium@503494                    400197504 +- 5735714       6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=http...oortonline.gl..run oortonline_tbmv2

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8967653747705960768


For feedback, file a bug with component Speed>Bisection