All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=751988

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=c034965e2418c4299991e80c919e4cd83a86c9c5bc02b359cda23be001004928


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

chromium-rel-win7-dual
chromium-rel-win7-x64-dual
win-high-dpi

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8972297586023321408

This is a suspiciously large improvement, perhaps something broke.

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

Suspected Commit
  Author : Ulan Degenbaev
  Commit : 2cc8fdfb47226101b958da465d64803368fb7c76
  Date   : Thu Jul 27 11:09:24 2017
  Subject: [heap] Re-implement weak cell tracking in the marker.

Bisect Details
  Configuration: win_perf_bisect
  Benchmark    : memory.long_running_idle_gmail_tbmv2
  Metric       : v8-gc-incremental-finalize_avg/v8-gc-incremental-finalize_avg
  Change       : 89.45% | 1.12870343915 -> 0.119116666667

Revision                           Result                     N
chromium@490014                    1.1287 +- 0.692112         6      good
chromium@490025                    1.1822 +- 0.9957           6      good
chromium@490027                    1.25329 +- 0.841566        6      good
chromium@490027,v8@2cc8fdfb47      0.116617 +- 0.0260737      6      bad       <--
chromium@490027,v8@6a75fcd4df      0.116211 +- 0.0250299      6      bad
chromium@490027,v8@e4bbf92be3      0.121024 +- 0.0345646      6      bad
chromium@490027,v8@9836cdb1ad      0.104942 +- 0.0205387      6      bad
chromium@490028                    0.12548 +- 0.126552        6      bad
chromium@490031                    0.104081 +- 0.020251       6      bad
chromium@490036                    0.147473 +- 0.149953       6      bad
chromium@490057                    0.109542 +- 0.0207109      6      bad
chromium@490099                    0.119117 +- 0.0377099      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 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/8972297586023321408


For feedback, file a bug with component Speed>Bisection