How to profile memory inside PartitionAlloc allocations?

[Aleks Totic]

I am profiling Chrome's memory usage using tc_malloc heap profiler and pprof.

This only shows allocations in the default tc_malloc heap. All the good stuff, LayoutObjects, etc, are not shown.

Is there a way to profile PartitionAlloc partitions too? I am ok with turning off PartitionAlloc for profiling, I am not interested in speed, just raw memory usage.

Aleks

[Vlad Tsyrklevich]

Chrome's heap profiler uses base::PartitionAllocHooks to inspect
allocations. Depending on what you're doing you may be able to use the
Chrome's built-in heap profiling, use the same hooks, or you could
also try defining MEMORY_TOOL_REPLACES_ALLOCATOR for just
base/allocator/partition_allocator/ to have those allocations fall
through to malloc/free.

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[Aleks Totic]

I ended up with a single line code change that made PartitionAlloc use tc_malloc.

--- a/base/allocator/partition_allocator/partition_alloc.h

+++ b/base/allocator/partition_allocator/partition_alloc.h

 +#define MEMORY_TOOL_REPLACES_ALLOCATOR 1

I was able to get memory profile with all the allocations. 

This, combined with pprof was very helpful in trying to understand total memory usage.

Aleks