All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=738821

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqnR-AgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnp28wwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnsasjwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnoPBuQkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnu6nuAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7omN0AgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg3qyMtgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7p60_ggM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgno71rwsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnpyutQkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnoCR7goM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnpXk6QoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnsCypAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgrpfywgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnsGozAsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnrum7woM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7oOQ8gsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnrGdqwsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnuXGtwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgntC4lgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7tOcxgsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnoDI-wkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnt2j8AsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnoq6uAkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqSb7AoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnrKrswsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg3s7jpgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7q6zzQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnuOJvAsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqOvuAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnurt8wgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7pvokgsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7ou20QgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnp-EkwgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnq7VuwsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnofrrgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7rWd9woM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7rXW2wkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnvb5ggoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnojUkAsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnujf8gkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnsmepgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnur76goM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgntKAjgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnq7wvQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnuTZxwsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg3qjUpQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqa9_AoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnoq6-AgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqXj8wgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnrqjzgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqTR5AkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7sKK7wsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgntz6uwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqjDiAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnoSC9AkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7p-4iAgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnrryqwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg3tirpgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7r3a3gkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnpOgqwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgno7_kAgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7v-j8wkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7r3a3goM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgntHM0QgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnvbu7QoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqXKrAsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDg7rn0tAsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnrz9pQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnvbA-AkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDgnqnGqQsM


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

android-nexus5
android-nexus5X
android-nexus6
android-nexus7v2
android-one
android-webview-nexus5X
android-webview-nexus6

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8975104832215820176

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

Suspected Commit
  Author : Ulan Degenbaev
  Commit : f341bb0f623821e56349735e47e1a9094f65d9a3
  Date   : Fri Jun 30 12:03:04 2017
  Subject: Revert "[heap] Allow a minimum semi-space size of 512K."

Bisect Details
  Configuration: android_webview_arm64_aosp_perf_bisect
  Benchmark    : v8.runtimestats.browsing_mobile
  Metric       : v8-gc-scavenger_avg/browse_social/browse_social_twitter
  Change       : 97.69% | 2.11840008783 -> 4.18781944444

Revision                           Result                   N
chromium@483695                    2.1184 +- 0.393006       6      good
chromium@483713                    2.13061 +- 0.336052      6      good
chromium@483722                    2.12255 +- 0.127363      6      good
chromium@483726                    2.1896 +- 0.451658       6      good
chromium@483728                    2.10265 +- 0.278435      6      good
chromium@483729                    2.11465 +- 0.150513      6      good
chromium@483729,v8@ca93156294      2.07923 +- 0.205302      6      good
chromium@483729,v8@f341bb0f62      4.19257 +- 0.861118      6      bad       <--
chromium@483729,v8@fa4314da8b      4.20743 +- 0.85466       6      bad
chromium@483729,v8@bfbabce113      4.24399 +- 0.61975       6      bad
chromium@483730                    4.40732 +- 0.861366      6      bad
chromium@483764                    4.18782 +- 0.614984      6      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=android-webview --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=browse.social.twitter v8.runtimestats.browsing_mobile

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8975104832215820176


For feedback, file a bug with component Speed>Bisection