All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=746259

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=5b0318cf9450c2282ba159c28ccd4d7b78411c750866ae3e5d0555d1124069ab


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

chromium-rel-mac11
chromium-rel-mac11-air
chromium-rel-mac12
chromium-rel-win7-dual

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8973651350453476960

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

Hi yangguo@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 : Yang Guo
  Commit : 182caaf4a9b94024e47007d426831c024345cb97
  Date   : Mon Jul 17 07:31:01 2017
  Subject: Do not track transitions for built-in objects.

Bisect Details
  Configuration: mac_10_12_perf_bisect
  Benchmark    : system_health.memory_desktop
  Metric       : memory:chrome:renderer_processes:reported_by_chrome:v8:heap:effective_size_avg/load_news/load_news_hackernews
  Change       : 7.48% | 3161745.33333 -> 3398260.0

Revision                           Result                  N
chromium@487029                    3161745 +- 1083.66      6      good
chromium@487040                    3162027 +- 3668.13      6      good
chromium@487043                    3162143 +- 3621.72      6      good
chromium@487043,v8@048dbc6491      3162027 +- 4688.64      6      good
chromium@487043,v8@182caaf4a9      3397811 +- 406.297      6      bad       <--
chromium@487043,v8@bba7c07e01      3405972 +- 44339.3      6      bad
chromium@487044                    3398268 +- 21.9089      6      bad
chromium@487045                    3398272 +- 19.5959      6      bad
chromium@487050                    3432260 +- 186221       6      bad
chromium@487070                    3398260 +- 63.7495      6      bad

Please refer to the following doc on diagnosing memory regressions:
  https://chromium.googlesource.com/chromium/src/+/master/docs/memory-infra/memory_benchmarks.md

To Run This Test
  src/tools/perf/run_benchmark -v --browser=release --output-format=chartjson --upload-results --pageset-repeat=1 --also-run-disabled-tests --story-filter=load.news.hackernews system_health.memory_desktop

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

Debug information about this bisect:
  https://chromeperf.appspot.com/buildbucket_job_status/8973651350453476960


For feedback, file a bug with component Speed>Bisection