GC Gen size counters don't show on Linux in native AOT

[eerhardt]

Description

When running our native AOT benchmarks on Linux, we aren't seeing GC Gen 0/1/2 and LOH/POH Sizes show from dotnet-coutners:

But when running them on Windows, we do see all the numbers show up:

Reproduction Steps

On linux, publish an app with PublishAot=true. Then run it and run dotnet-counters monitor on the process.

Expected behavior

Should show values for Gen 0 Size (B), Gen 1 Size (B), etc.

Actual behavior

All those values have 0.

Regression?

No response

Known Workarounds

No response

Configuration

No response

Other information

cc @LakshanF @agocke @mao

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Issue Details

---

Description

When running our native AOT benchmarks on Linux, we aren't seeing GC Gen 0/1/2 and LOH/POH Sizes show from dotnet-coutners:

But when running them on Windows, we do see all the numbers show up:

Reproduction Steps

On linux, publish an app with PublishAot=true. Then run it and run dotnet-counters monitor on the process.

Expected behavior

Should show values for Gen 0 Size (B), Gen 1 Size (B), etc.

Actual behavior

All those values have 0.

Regression?

No response

Known Workarounds

No response

Configuration

No response

Other information

cc @LakshanF @agocke @mao

Author:	eerhardt
Assignees:	LakshanF
Labels:	untriaged, area-NativeAOT-coreclr, needs-area-label
Milestone:	-

[elinor-fung]

Pretty sure this is because a bunch of the tracking for GC info is under #ifdef FEATURE_EVENT_TRACE:

runtime/src/coreclr/gc/gcee.cpp

Lines 72 to 80 in fa4f15e

	void GCHeap::UpdatePostGCCounters()
	{
	totalSurvivedSize = gc_heap::get_total_survived_size();
	//
	// The following is for instrumentation.
	//
	// Calculate the common ones for ETW and perf counters.
	#ifdef FEATURE_EVENT_TRACE

And nativeaot only defines it on Windows:

runtime/src/coreclr/nativeaot/Runtime/CMakeLists.txt

Lines 239 to 241 in fa4f15e

	if(WIN32)
	add_definitions(-DFEATURE_ETW)
	add_definitions(-DFEATURE_EVENT_TRACE)

[LakshanF]

I can see Gen 0/1/2 Size and POH Size values in a Linux build for a repro app after the fix went in.