All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=874437

(For debugging:) Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?sid=d4fba4640cddded79db83646b281d0604aa266a60ac8ac2eb3e1b14f346282c1


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

Android Nexus6 WebView Perf

📍 Pinpoint job started.
https://pinpoint-dot-chromeperf.appspot.com/job/1693257c640000

📍 Found a significant difference after 1 commit.
https://pinpoint-dot-chromeperf.appspot.com/job/1693257c640000

[heap] Use std::atomic for page flags. by hpayer@chromium.org
https://chromium.googlesource.com/v8/v8/+/7f3f7e8a9547ece1a7f80ce902bc23632e902b0b
1.977 → 6.64 (+4.663)

Understanding performance regressions:
  http://g.co/ChromePerformanceRegressions

 Issue 874434  has been merged into this issue.

 Issue 874887  has been merged into this issue.

 Issue 874897  has been merged into this issue.

 Issue 874955  has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/v8/v8.git/+/f29fbf35a91b8808aea1c21071e189b47d6c831b

commit f29fbf35a91b8808aea1c21071e189b47d6c831b
Author: Hannes Payer <hpayer@chromium.org>
Date: Tue Aug 21 20:20:51 2018

[heap] Provide memory order relaxed accessor of page flags.

Bug:  chromium:874437 ,chromium:852420
Change-Id: I4f484a6bb7072804dbcaacab77d25ba7a3fe338f
Reviewed-on: https://chromium-review.googlesource.com/1183188
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55287}
[modify] https://crrev.com/f29fbf35a91b8808aea1c21071e189b47d6c831b/src/heap/spaces.h

The following revision refers to this bug:
  https://chromium.googlesource.com/v8/v8.git/+/fc8a34a3f10afd6d4830a3f0093d2b26358cf231

commit fc8a34a3f10afd6d4830a3f0093d2b26358cf231
Author: Hannes Payer <hpayer@chromium.org>
Date: Wed Aug 22 14:40:56 2018

Revert "[heap] Provide memory order relaxed accessor of page flags."

This reverts commit f29fbf35a91b8808aea1c21071e189b47d6c831b.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> [heap] Provide memory order relaxed accessor of page flags.
> 
> Bug:  chromium:874437 ,chromium:852420
> Change-Id: I4f484a6bb7072804dbcaacab77d25ba7a3fe338f
> Reviewed-on: https://chromium-review.googlesource.com/1183188
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Commit-Queue: Hannes Payer <hpayer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#55287}

TBR=ulan@chromium.org,hpayer@chromium.org

Change-Id: I5703641fd99a9dc79e2819af1597d4440e2e9990
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug:  chromium:874437 , chromium:852420
Reviewed-on: https://chromium-review.googlesource.com/1185161
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55307}
[modify] https://crrev.com/fc8a34a3f10afd6d4830a3f0093d2b26358cf231/src/heap/spaces.h