The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/12531f29074985a71e18f60a2e8ea79b4f24314c

commit 12531f29074985a71e18f60a2e8ea79b4f24314c
Author: erikchen <erikchen@chromium.org>
Date: Fri Apr 21 19:48:51 2017

Use faster, but less information methods to calculate memory dumps on macOS.

Switch to use mach_vm_region(TOP_INFO) and mach_vm_region(BASIC_INFO) instead of
mach_vm_region_recurse(). While the latter provides more information, both on
submaps and on swapped/clean pages, it's two order of magnitudes slower.
Attempting to take a memory dump with ~50 renderer renderers my machine unusable
for over a minute.

BUG= 713481 

Review-Url: https://codereview.chromium.org/2826123004
Cr-Commit-Position: refs/heads/master@{#466417}

[modify] https://crrev.com/12531f29074985a71e18f60a2e8ea79b4f24314c/base/process/process_metrics.h
[modify] https://crrev.com/12531f29074985a71e18f60a2e8ea79b4f24314c/base/process/process_metrics_mac.cc
[modify] https://crrev.com/12531f29074985a71e18f60a2e8ea79b4f24314c/components/tracing/common/process_metrics_memory_dump_provider.cc

Issue 714664 has been merged into this issue.

Your change meets the bar and is auto-approved for M59. Please go ahead and merge the CL to branch 3071 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), gkihumba@(ChromeOS), Abdul Syed@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/8f0910deb4cac181efa7976efca1a3811dcbe93d

commit 8f0910deb4cac181efa7976efca1a3811dcbe93d
Author: erikchen <erikchen@chromium.org>
Date: Mon Apr 24 21:06:28 2017

[Merge to 3071] Use faster, but less information methods to calculate memory dumps on macOS.

> Switch to use mach_vm_region(TOP_INFO) and mach_vm_region(BASIC_INFO) instead of
> mach_vm_region_recurse(). While the latter provides more information, both on
> submaps and on swapped/clean pages, it's two order of magnitudes slower.
> Attempting to take a memory dump with ~50 renderer renderers my machine unusable
> for over a minute.

BUG= 713481 

Review-Url: https://codereview.chromium.org/2826123004
Cr-Commit-Position: refs/heads/master@{#466417}
(cherry picked from commit 12531f29074985a71e18f60a2e8ea79b4f24314c)

Review-Url: https://codereview.chromium.org/2840733002 .
Cr-Commit-Position: refs/branch-heads/3071@{#177}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}

[modify] https://crrev.com/8f0910deb4cac181efa7976efca1a3811dcbe93d/base/process/process_metrics.h
[modify] https://crrev.com/8f0910deb4cac181efa7976efca1a3811dcbe93d/base/process/process_metrics_mac.cc
[modify] https://crrev.com/8f0910deb4cac181efa7976efca1a3811dcbe93d/components/tracing/common/process_metrics_memory_dump_provider.cc