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[scudo][standalone] Add more stats to mallinfo
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Authored by cryptoad on Aug 12 2019, 3:07 PM.

Details

Summary

Android requires additional stats in mallinfo. While we can provide
right away the number of bytes mapped (Primary+Secondary), there was
no way to get the number of free bytes (only makes sense for the
Primary since the Secondary unmaps everything on deallocation).

An approximation could be StatMapped - StatAllocated, but since we
are mapping in 1<<17 increments for the 64-bit Primary, it's fairly
inaccurate.

So we introduce StatFree (note it's Free, not Freed!), which
keeps track of the amount of Primary blocks currently unallocated.

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Repository
rL LLVM

Event Timeline

cryptoad created this revision.Aug 12 2019, 3:07 PM
Herald added projects: Restricted Project, Restricted Project. · View Herald TranscriptAug 12 2019, 3:07 PM
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cryptoad updated this revision to Diff 214724.Aug 12 2019, 3:35 PM

Adding usmblks as well.
Android uses it for getNativeHeapSize, so StatMapped will do.

This revision is now accepted and ready to land.Aug 13 2019, 9:45 AM
This revision was automatically updated to reflect the committed changes.