All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=740444

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=87d0f305797bc5fc437106047c9f3ffe70e8d444dde2747ffbe1266affcb4d64


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

chromium-rel-mac-retina

Started bisect job https://chromeperf.appspot.com/buildbucket_job_status/8974476299076704144

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

Suspected Commit
  Author : Yutaka Hirano
  Commit : 84047549ac37bab70d7306566c912e59131f3e1f
  Date   : Mon Jun 19 04:16:15 2017
  Subject: [Loading] Save one post-task when the data pipe is ready on arrival

Bisect Details
  Configuration: mac_retina_perf_bisect
  Benchmark    : system_health.memory_desktop
  Metric       : memory:chrome:all_processes:reported_by_chrome:cc:effective_size_avg/load_news/load_news_hackernews
  Change       : 38.85% | 61845328.0 -> 41248299.4286

Revision             Result                    N
chromium@480312      61845328 +- 0.0           9       good
chromium@480331      61845328 +- 0.0           9       good
chromium@480340      61845328 +- 0.0           14      good
chromium@480341      61845328 +- 0.0           9       good
chromium@480342      37815461 +- 26323400      6       bad       <--
chromium@480343      37815461 +- 26323400      6       bad
chromium@480345      46740840 +- 65996257      21      bad
chromium@480349      41248299 +- 48741466      14      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/8974476299076704144


For feedback, file a bug with component Speed>Bisection