All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=770074

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=d51bf626603d3e87816816efee54158a8b64eb9a46d4a32de7866d57442580f3


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

android-nexus7v2

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8967135700095352144

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

Suspected Commit
  Author : Albert Mingkun Yang
  Commit : dbfdd4f9e9741df0a541afdd7516a34304102ee8
  Date   : Thu Sep 14 09:10:09 2017
  Subject: [heap] Turn on v8_enable_csa_write_barrier

Bisect Details
  Configuration: android_nexus7_perf_bisect
  Benchmark    : v8.runtimestats.browsing_mobile
  Metric       : v8-gc-full-mark-compactor_sum/browse_news/browse_news_reddit
  Change       : 20.13% | 34.3135384615 -> 42.0012

Revision                           Result                  N
chromium@502412                    34.3135 +- 3.04382      13      good
chromium@502444                    35.7268 +- 8.59382      10      good
chromium@502460                    35.5455 +- 1.707        4       good
chromium@502468                    34.8946 +- 5.0012       7       good
chromium@502470                    34.9663 +- 2.4026       9       good
chromium@502470,v8@46000a1244      36.4141 +- 10.7873      14      good
chromium@502470,v8@97b2a814e4      35.1686 +- 3.41479      5       good
chromium@502470,v8@dbfdd4f9e9      41.6107 +- 7.32636      10      bad       <--
chromium@502470,v8@725c15c794      44.0064 +- 3.86047      7       bad
chromium@502470,v8@70372dfc64      42.633 +- 4.97407       5       bad
chromium@502471                    42.578 +- 2.06956       5       bad
chromium@502472                    42.0623 +- 12.8683      10      bad
chromium@502476                    42.0012 +- 4.6217       10      bad

To Run This Test
  src/tools/perf/run_benchmark -v --browser=android-chromium --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=browse.news.reddit 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/8967135700095352144


For feedback, file a bug with component Speed>Bisection