All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=751042

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=256c1b24f5a2cfed0b2f02d4516a87ff74f0125e53917de66063be2fd08dafde


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

chromium-rel-mac-retina
chromium-rel-mac11-pro
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

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8972474384329940384

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8972474348047163856

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

Suspected Commit
  Author : Ulan Degenbaev
  Commit : 774a4c5e240569b551cc9d19ae8cac146891d4c4
  Date   : Fri Jul 28 19:42:31 2017
  Subject: Revert "[heap] Reland "[heap] Allow a minimum semi-space size of 512K.""

Bisect Details
  Configuration: winx64ati_perf_bisect
  Benchmark    : v8.browsing_desktop
  Metric       : memory:chrome:renderer_processes:reported_by_chrome:v8:heap:effective_size_max/browse_search/browse_search_google_india
  Change       : 15.05% | 18576725.3333 -> 21372928.0

Revision                           Result                   N
chromium@490644                    18576725 +- 1284238      9      good
chromium@490652                    18227200 +- 1284238      9      good
chromium@490652,v8@59ddd6061c      18576725 +- 605396       6      good
chromium@490652,v8@e567dd3ab4      18489344 +- 642119       6      good
chromium@490652,v8@774a4c5e24      22421504 +- 0.0          6      bad       <--
chromium@490652,v8@4a9718c777      21809835 +- 1878191      6      bad
chromium@490653                    21722453 +- 5397875      9      bad
chromium@490654                    22334123 +- 478607       6      bad
chromium@490656                    21635072 +- 3210595      6      bad
chromium@490659                    21372928 +- 3397775      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 --story-filter=browse.search.google.india 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/8972474348047163856


For feedback, file a bug with component Speed>Bisection

=== BISECT JOB RESULTS ===
Perf regression found but unable to narrow commit range

Build failures prevented the bisect from narrowing the range further.


Bisect Details
  Configuration: win_perf_bisect
  Benchmark    : v8.browsing_desktop
  Metric       : v8-gc-scavenger_avg/browse_search/browse_search_google_india
  Change       : 39.12% | 0.638399760331 -> 0.888146187364

Suspected Commit Range
  2 commits in range
  https://chromium.googlesource.com/v8/v8.git/+log/e567dd3ab4b5ec1c72ff91716800b0fcdcd2c1b2..4a9718c7776b48deb4a49d66d5079f26a14c31c0


Revision                           Result                    N
chromium@490644                    0.6384 +- 0.516997        14       good
chromium@490650                    0.628984 +- 0.531369      14       good
chromium@490652                    0.578717 +- 0.474225      9        good
chromium@490652,v8@59ddd6061c      0.581213 +- 0.439021      9        good
chromium@490652,v8@e567dd3ab4      0.672768 +- 0.806403      14       good
chromium@490652,v8@774a4c5e24      ---                       ---      build failure
chromium@490652,v8@4a9718c777      0.844019 +- 0.818042      14       bad
chromium@490653                    0.941206 +- 0.580307      6        bad
chromium@490656                    0.865643 +- 0.882689      14       bad
chromium@490667                    0.888146 +- 0.666258      9        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=browse.search.google.india 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/8972474384329940384


For feedback, file a bug with component Speed>Bisection