All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=774464

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=f1c5afcb9bdbf7ea318ac8426e8cf47af6ed618209952fbadf714044430bee67


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

chromium-rel-mac12
chromium-rel-mac12-mini-8gb
chromium-rel-win10
chromium-rel-win7-dual
chromium-rel-win7-gpu-ati
chromium-rel-win7-gpu-nvidia
chromium-rel-win8-dual
linux-release
win-high-dpi

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8965846974524752592

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

Suspected Commit
  Author : Benedikt Meurer
  Commit : 08db4d7652967c1ed12450a73ff53f5d6bbf1fdf
  Date   : Mon Oct 02 12:35:05 2017
  Subject: [ic] Properly handle polymorphic symbol accesses.

Bisect Details
  Configuration: mac_10_12_perf_bisect
  Benchmark    : v8.browsing_desktop
  Metric       : memory:chrome:renderer_processes:reported_by_chrome:v8:heap:allocated_objects_size_avg/browse_media/browse_media_tumblr
  Change       : 7.72% | 24512867.1406 -> 26406335.8588

Revision                           Result                   N
chromium@505688                    24512867 +- 501293       6      good
chromium@505726                    24224932 +- 517577       6      good
chromium@505731                    24413180 +- 601615       6      good
chromium@505731,v8@08db4d7652      26701107 +- 647031       6      bad       <--
chromium@505731,v8@17d86d76fb      26538505 +- 1855199      6      bad
chromium@505731,v8@1fa0f9ba4c      26736995 +- 654757       6      bad
chromium@505732                    26696512 +- 1266109      6      bad
chromium@505733                    26549566 +- 1864843      6      bad
chromium@505734                    26532622 +- 720143       6      bad
chromium@505736                    26426404 +- 999794       6      bad
chromium@505745                    26374314 +- 730517       6      bad
chromium@505763                    26737131 +- 673719       6      bad
chromium@505837                    26406336 +- 1011004      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=browse.media.tumblr 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/8965846974524752592


For feedback, file a bug with component Speed>Bisection