See the link to graphs below.
All graphs for this bug: https://chromeperf.appspot.com/group_report?bug_id=834214 (For debugging:) Original alerts at time of bug-filing: https://chromeperf.appspot.com/group_report?sid=ab80143f79c4036bf8efca0f932e44b32cb78a5a45afbd198c4975cb779c97f5 Bot(s) for this bug's original alert(s): android-nexus5 android-nexus5X android-nexus7v2
📍 Pinpoint job started. https://pinpoint-dot-chromeperf.appspot.com/job/14c6726ec40000
📍 Found significant differences after each of 2 commits. https://pinpoint-dot-chromeperf.appspot.com/job/14c6726ec40000 [ubsan] Make Isolate inherit from Factory by delphick@chromium.org https://chromium.googlesource.com/v8/v8/+/5ed349d66def9b2fb9617f11d8993bbe9c9d186a Update V8 to version 6.8.16. by v8-autoroll@chromium.org https://chromium.googlesource.com/chromium/src/+/bae5c9e0e482a0f0bc56a992046dc62ece7f1325 Understanding performance regressions: http://g.co/ChromePerformanceRegressions
Looks like the memory metric is broken as it reports 4GB size of "other_spaces" in V8. Most likely unsigned int underflow. https://00e9e64bacc5c7ee3a3f630351e242111e0e5fd302aa4af6d5-apidata.googleusercontent.com/download/storage/v1/b/chrome-telemetry-output/o/load_news_qq_2018-04-18_06-38-12_53018.html?qk=AD5uMEsdjX5Wo_P8kCKrDH2GESJbjA4VQbpZ6LU8hen7t67cZH1Gl11rltIHMzCAoWOzEa3lk9VPkJD6kcsnB8kPe0iZzstToZoC8VG7kezgbkrL4iF-Ujdzry_wfAZ8P_1K9IF7jzl_SkHY4yP66p7N5o3XyXemnQE0O_vF9qcrw4wnsFMLzRxOYz_VhTGdjlu97N2HjZPBR6D-XIDqwoppdNemfLxfE8NtHbCWw5sukF7szy30MKasiQ17mhhGz--EqdKCuDqbQrsgFTWRuWPyjWJOhym-RWKEEIFzXyaOvqbNxWIiLC3Sep52IeX5XqgZf16JMYOZE2ktlv_LBrtrfNOtu6mSTe1URrcxBJIVtzk7kaDR6VnYDQPKecb2Lq5G8RfYn8IhQLvMNtRQtAdDI_OribtGZRNGQVp5uxF0AaNPPWPloAn0aD0Nc5HlNPJDHEhJohgzcopKcpuFLPnWJ09Vw7Y687kXwVeSOjOc4dME2iXroTlDGoCtvX6e2KhXjATGtH0M1_cSYaDkf3d9iNkElGiXmn6Cnrcy-ilgYpOg4aDROXwg25iQzdQGLP1wZHRtuzxsiSCui8zsiKXY2qDAiqdrdHmyx3S4u3jKux8b4qoCSZOnNSbfewJeteYV23akLkM2e1BzfnDuI-8HWE4VOsq1xFBMkHKVSMUiURmRnTgbGW8MYbVHWiE8TIbA8S4D1s71sWElxGv4Rrs7z2JBOM11rpEVFr4LKaMyc0j7XDrgKaypivCBEVit04SXzMfYdT1_jxvl5bAVAVjsZClM3axJ5w
Investigation of #4 continues in https://bugs.chromium.org/p/v8/issues/detail?id=7668
Comment 1 by 42576172...@developer.gserviceaccount.com
, Apr 18 2018