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Issue 809651 link

Starred by 1 user
Status: Fixed
Owner:
bbudge@chromium.org
Closed: Feb 2018
Cc:
█ ajwong@chromium.org
bbudge@chromium.org
haraken@chromium.org
erikc...@chromium.org
primiano@chromium.org
Components:
EstimatedDays: ----
NextAction: ----
OS: Mac
Pri: 1
Type: Bug



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PA and v8 MDPs report the wrong numbers on macOS.

Project Member Reported by erikc...@chromium.org, Feb 6 2018 
Repro steps:

1) Open a tab to youtube.com. PLay a video.
2) Open a tab to chrome://tracing. Take a memory-infra trace.
3) Run "vmmap -v -interleaved <pid>" in a terminal
4) Open a tab to chrome://tracing. Take a memory-infra trace.

Observations:
In (2) and (4), memory-infra reports 40MB v8, 13MB PA.
In (3), vmmap reports 69MB dirty pages of "Memory tag 254", which is only used by PA and v8. 

I'll continue to dig to see what's going on.
trace_youtube11.json.gz
237 KB Download
trace_youtube12.json.gz
261 KB Download

Comment 1 by erikc...@chromium.org, Feb 6 2018

Cc: haraken@chromium.org
Part of the problem is that recent changes made more PartitionAllocatorGenerics [https://chromium-review.googlesource.com/c/chromium/src/+/853120], 

but did not update the PartitionAllocator MDP:
https://cs.chromium.org/chromium/src/third_party/WebKit/Source/platform/wtf/allocator/Partitions.cpp?type=cs&l=131

Comment 2 by erikc...@chromium.org, Feb 6 2018

Cc: erikc...@chromium.org
Owner: bbudge@chromium.org
The rest of the difference is accounted for by the fact that oilpan uses the allocator from partition alloc, which takes the memory regions as 254.

Over to bbudge to fix the MDP bug.

Comment 3 by bbudge@chromium.org, Feb 15 2018

Status: Fixed (was: Assigned)
►

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