Android Q uses mallinfo as part of the ART GC for better integration with native code: developer.android.com/preview/featur.
Commits:
android.googlesource.com/platform/art/+
android.googlesource.com/platform/art/+
I added an actual implementation to hardened_malloc in preparation for moving to Q:
github.com/GrapheneOS/har
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This is broken in glibc due to using `int` instead of `size_t` and incorrectly setting fields so I still expose a stub implementation for that platform. Android inherited it from dlmalloc which walks the heap for this and added it to jemalloc for compatibility when they migrated.
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Implementation for jemalloc in Android is quite similar to this one. They iterate through the arenas (grabbing each lock) to get the stats for mappings and large / huge allocations followed by iterating through the size class bins (grabbing each lock). They also added some APIs.