All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=748393

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=221e917950d8ea0e30d03111022f3c3495685238234dadbc757a852e34b47eac


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

android-nexus5

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8973116623280582160

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

Suspected Commit
  Author : Ulan Degenbaev
  Commit : 176a2b24fb23a0c9a3bc9eec27f6445dbfa5ab27
  Date   : Wed Jul 19 13:04:47 2017
  Subject: [heap] Reland "[heap] Allow a minimum semi-space size of 512K."

Bisect Details
  Configuration: android_nexus5_perf_bisect
  Benchmark    : v8.runtimestats.browsing_mobile
  Metric       : GC:duration_avg/browse_social/browse_social_instagram
  Change       : 51.42% | 285.604666667 -> 432.4515

Revision                           Result                  N
chromium@487872                    285.605 +- 15.5564      6      good
chromium@487929                    292.985 +- 26.0365      6      good
chromium@487957                    285.319 +- 21.3962      6      good
chromium@487971                    301.509 +- 47.2864      6      good
chromium@487978                    287.96 +- 26.7065       6      good
chromium@487982                    280.653 +- 28.3174      6      good
chromium@487984                    298.93 +- 41.2931       6      good
chromium@487984,v8@bb29f9a4d6      284.91 +- 22.7016       6      good
chromium@487984,v8@176a2b24fb      416.804 +- 43.3969      6      bad       <--
chromium@487984,v8@40c34606a7      423.186 +- 23.9568      6      bad
chromium@487985                    427.276 +- 35.0207      6      bad
chromium@488097                    432.452 +- 19.5851      6      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.social.instagram 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/8973116623280582160


For feedback, file a bug with component Speed>Bisection