All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=766575

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=d4778804d9d87ee04292d953bd297f93b00a69702fb6e166607e87166ab578fc


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

chromium-rel-mac-retina
chromium-rel-win7-gpu-intel

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8968030438359502912

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

Hi jarin@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 : Jaroslav Sevcik
  Commit : 2b15425b0c131869dbd5c9c486d402b6b911fca4
  Date   : Fri Sep 15 10:59:26 2017
  Subject: [turbofan] Temporarily turn off escape analysis.

Bisect Details
  Configuration: mac_retina_perf_bisect
  Benchmark    : jetstream
  Metric       : Score/Score
  Change       : 2.20% | 179.166666667 -> 175.222222222

Revision                           Result                   N
chromium@502366                    179.167 +- 1.0274        6      good
chromium@502419                    178.778 +- 1.30526       6      good
chromium@502445                    178.5 +- 1.39443         6      good
chromium@502458                    178.778 +- 1.12217       6      good
chromium@502465                    178.889 +- 1.5396        6      good
chromium@502468                    179.111 +- 2.09054       6      good
chromium@502470                    179.167 +- 0.912871      6      good
chromium@502470,v8@70372dfc64      178.278 +- 1.09713       6      good
chromium@502470,v8@a10e4a179e      178.5 +- 1.31233         6      good
chromium@502470,v8@34bc3cb4af      178.389 +- 0.871355      6      good
chromium@502470,v8@2b15425b0c      175.444 +- 1.01835       6      bad       <--
chromium@502470,v8@c87f8954cc      175.611 +- 1.2838        6      bad
chromium@502471                    175.222 +- 1.67774       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 jetstream

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8968030438359502912


For feedback, file a bug with component Speed>Bisection

Fixed by https://chromium.googlesource.com/v8/v8/+/d6ff08223bab0a0ca8b5c8413b13f87257cf1a58