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Draft: runtime: MemStats.Alloc/HeapAlloc support #3424

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Draft: runtime: MemStats.Alloc/HeapAlloc support #3424

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18 changes: 18 additions & 0 deletions src/runtime/mstats.go
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,11 @@ package runtime
type MemStats struct {
// General statistics.

// Alloc is bytes of allocated heap objects.
//
// This is the same as HeapAlloc (see below).
Alloc uint64

// Sys is the total bytes of memory obtained from the OS.
//
// Sys is the sum of the XSys fields below. Sys measures the
Expand All @@ -18,6 +23,19 @@ type MemStats struct {

// Heap memory statistics.

// HeapAlloc is bytes of allocated heap objects.
//
// "Allocated" heap objects include all reachable objects, as
// well as unreachable objects that the garbage collector has
// not yet freed. Specifically, HeapAlloc increases as heap
// objects are allocated and decreases as the heap is swept
// and unreachable objects are freed. Sweeping occurs
// incrementally between GC cycles, so these two processes
// occur simultaneously, and as a result HeapAlloc tends to
// change smoothly (in contrast with the sawtooth that is
// typical of stop-the-world garbage collectors).
HeapAlloc uint64

// HeapSys is bytes of heap memory, total.
//
// In TinyGo unlike upstream Go, we make no distinction between
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