All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=752867

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=658ae64eb525de46f77f8380661a985ab5388e1db22fb7c4b76f9677628be453


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

android-nexus5X
android-nexus7v2

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8971935663028397344

=== Auto-CCing suspected CL author jkummerow@chromium.org ===

Hi jkummerow@chromium.org, the bisect results pointed to your CL, please take a look at the
results.


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

Suspected Commit
  Author : Jakob Kummerow
  Commit : 05e862f78398d8bbeacc7f9e19bbb41c408e709b
  Date   : Fri Aug 04 01:27:42 2017
  Subject: Cache StoreIC-Transition handlers

Bisect Details
  Configuration: android_nexus7_perf_bisect
  Benchmark    : media.android.tough_video_cases_tbmv2
  Metric       : memory:chrome:renderer_processes:reported_by_chrome:v8:heap:effective_size_avg/video.html?src_tulip2.vp9.webm_background
  Change       : 1.26% | 2185964.0 -> 2213420.0

Revision                           Result                  N
chromium@492049                    2185964 +- 0.0          6      good
chromium@492127                    2185964 +- 0.0          6      good
chromium@492147                    2185964 +- 0.0          6      good
chromium@492157                    2185964 +- 0.0          6      good
chromium@492160                    2185967 +- 14.6059      6      good
chromium@492161                    2185964 +- 0.0          6      good
chromium@492161,v8@5614747680      2185964 +- 0.0          6      good
chromium@492161,v8@2fd5e70a03      2186688 +- 0.0          6      good
chromium@492161,v8@9735d7f109      2186688 +- 0.0          6      good
chromium@492161,v8@0caf1d2029      2184544 +- 0.0          6      good
chromium@492161,v8@05e862f783      2212100 +- 0.0          6      bad       <--
chromium@492162                    2213420 +- 0.0          6      bad
chromium@492166                    2213420 +- 0.0          6      bad
chromium@492205                    2213420 +- 0.0          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=video.html.src.tulip2.vp9.webm.background media.android.tough_video_cases_tbmv2

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8971935663028397344


For feedback, file a bug with component Speed>Bisection

 Issue 753040  has been merged into this issue.

 Issue 753039  has been merged into this issue.

 Issue 754641  has been merged into this issue.

 Issue 754630  has been merged into this issue.

 Issue 755081  has been merged into this issue.

 Issue 755084  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/v8/v8.git/+/a3ef2489f299aef5a5393985c9351aace0602390

commit a3ef2489f299aef5a5393985c9351aace0602390
Author: Jakob Kummerow <jkummerow@chromium.org>
Date: Fri Aug 18 16:06:44 2017

Cache fewer StoreIC-Transition handlers

Many handlers are not used again, so we can improve the cache hit rate
by caching fewer handlers. Specifically, in this CL, when a StoreIC
miss causes a new map transition to be created, then the handler is not
cached right away yet (it will be cached next time, when the transition
exists already).

Also, fix an embarrassing bug where growing a TransitionArray dropped
cached handlers. That further improves the cache hit rate. ;-)

Bug:  chromium:752867 ,  chromium:753819 
Change-Id: Id8db5ca1e780a5fe8fc61db7f20996e61c65a90e
Reviewed-on: https://chromium-review.googlesource.com/619851
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47433}
[modify] https://crrev.com/a3ef2489f299aef5a5393985c9351aace0602390/src/ic/ic.cc
[modify] https://crrev.com/a3ef2489f299aef5a5393985c9351aace0602390/src/ic/ic.h
[modify] https://crrev.com/a3ef2489f299aef5a5393985c9351aace0602390/src/lookup.cc
[modify] https://crrev.com/a3ef2489f299aef5a5393985c9351aace0602390/src/lookup.h
[modify] https://crrev.com/a3ef2489f299aef5a5393985c9351aace0602390/src/objects.cc
[modify] https://crrev.com/a3ef2489f299aef5a5393985c9351aace0602390/src/objects/map.h
[modify] https://crrev.com/a3ef2489f299aef5a5393985c9351aace0602390/src/transitions.cc
[modify] https://crrev.com/a3ef2489f299aef5a5393985c9351aace0602390/test/cctest/test-field-type-tracking.cc

 Issue 757314  has been merged into this issue.

 Issue 757330  has been merged into this issue.

 Issue 757304  has been merged into this issue.

 Issue 757304  has been merged into this issue.

 Issue 757323  has been merged into this issue.

 Issue 754638  has been merged into this issue.

 Issue 757733  has been merged into this issue.

Recovered with 1785fc368edf760c22b94def899f8364256990ee.