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allocator: Add optional heap allocation measurement tracking. (#38727)

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Add an off-by-default allocator mode that tracks all live allocations
with sizes and associated stack traces. We also track if each allocation
is visited as part of a measuring heap usage in `about:memory`, allowing
us to report on allocations that are not tracked yet. Right now the list
of untracked allocations is dumped to stdout; I have a python script
coming in a separate PR which makes it easier to perform analysis on the
massive output.

Testing: Manually tested with `./mach build -d --features
servo_allocator/allocation-tracking` and visiting about:memory.
Part of: #11559

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Signed-off-by: Josh Matthews <josh@joshmatthews.net>
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Josh Matthews 2025-08-19 14:49:27 -04:00 • committed by GitHub
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8 changed files with 280 additions and 7 deletions
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ports/servoshell/Cargo.toml
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@ -121,7 +121,7 @@ headers = { workspace = true }
net = { path = "../../components/net" }
net_traits = { workspace = true }
serde_json = { workspace = true }
# For optional feature servo_allocator/use-system-allocator
# For optional feature servo_allocator/use-system-allocator and servo_allocator/allocation-tracking
servo_allocator = { path = "../../components/allocator" }
surfman = { workspace = true, features = ["sm-raw-window-handle-06", "sm-x11"] }
winit = { workspace = true }