[ProfilerAPI] Different reserved region sizes reported for frozen segment

[ww898]

Description

I see different region reserved sizes for the same frozen segment reported by GetGenerationBounds (type=soh2 in log) and GetNonGCHeapBounds (type=foh in log) calls:

0000449C 1 0000027202149FE0 GG::Heaps c=7
	#0 type=poh  base=0000027280000028 size=0000000000003FF0 reservedSize=0000000001FFFFD8 objectSizeAlignment=8
	#1 type=loh  base=0000027282C00028 size=0000000000050820 reservedSize=0000000001FFFFD8 objectSizeAlignment=8
	#2 type=soh2 base=0000027202170008 size=0000000000007020 reservedSize=00000000003FFFF8 objectSizeAlignment=8 // <=== here
	#3 type=soh2 base=0000027282800028 size=00000000000151B8 reservedSize=00000000003FFFD8 objectSizeAlignment=8
	#4 type=soh1 base=0000027282000028 size=0000000000000000 reservedSize=00000000003FFFD8 objectSizeAlignment=8
	#5 type=soh0 base=0000027284C00028 size=000000000010B0A0 reservedSize=00000000003FFFD8 objectSizeAlignment=8
	#6 type=foh  base=0000027202170008 size=0000000000007020 reservedSize=0000000000400000 objectSizeAlignment=8 // <=== here

Reproduction Steps

Application to reproduce the issue:

Console.WriteLine("Hello, World!");
Console.ReadLine();

Expected behavior

base=0000027202170008 size=0000000000007020 reservedSize=00000000003FFFF8

Actual behavior

base=0000027202170008 size=0000000000007020 reservedSize=0000000000400000

Regression?

No response

Known Workarounds

No response

Configuration

.NET 8.0-preview.5
Windows 10 Pro 22H2 x64

Other information

No response

[ww898]

runtime/src/coreclr/vm/proftoeeinterfaceimpl.cpp

Line 7692 in 19a088e

ranges[segIdx].rangeLengthReserved = (UINT_PTR)segments[segIdx]->m_Size;

We should subtract sizeof(ObjHeader) in this line

Tagging subscribers to this area: @dotnet/gc
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Description

I see different region reserved sizes for the same frozen segment reported by GetGenerationBounds (type=soh2 in log) and GetNonGCHeapBounds (type=foh in log) calls:

0000449C 1 0000027202149FE0 GG::Heaps c=7
	#0 type=poh  base=0000027280000028 size=0000000000003FF0 reservedSize=0000000001FFFFD8 objectSizeAlignment=8
	#1 type=loh  base=0000027282C00028 size=0000000000050820 reservedSize=0000000001FFFFD8 objectSizeAlignment=8
	#2 type=soh2 base=0000027202170008 size=0000000000007020 reservedSize=00000000003FFFF8 objectSizeAlignment=8 // <=== here
	#3 type=soh2 base=0000027282800028 size=00000000000151B8 reservedSize=00000000003FFFD8 objectSizeAlignment=8
	#4 type=soh1 base=0000027282000028 size=0000000000000000 reservedSize=00000000003FFFD8 objectSizeAlignment=8
	#5 type=soh0 base=0000027284C00028 size=000000000010B0A0 reservedSize=00000000003FFFD8 objectSizeAlignment=8
	#6 type=foh  base=0000027202170008 size=0000000000007020 reservedSize=0000000000400000 objectSizeAlignment=8 // <=== here

Reproduction Steps

Application to reproduce the issue:

Console.WriteLine("Hello, World!");
Console.ReadLine();

Expected behavior

base=0000027202170008 size=0000000000007020 reservedSize=00000000003FFFF8

Actual behavior

base=0000027202170008 size=0000000000007020 reservedSize=0000000000400000

Regression?

No response

Known Workarounds

No response

Configuration

.NET 8.0-preview.5
Windows 10 Pro 22H2 x64

Other information

No response

Author:	ww898
Assignees:	-
Labels:	area-GC-coreclr, untriaged, needs-area-label
Milestone:	-

Tagging subscribers to this area: @tommcdon
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Description

I see different region reserved sizes for the same frozen segment reported by GetGenerationBounds (type=soh2 in log) and GetNonGCHeapBounds (type=foh in log) calls:

0000449C 1 0000027202149FE0 GG::Heaps c=7
	#0 type=poh  base=0000027280000028 size=0000000000003FF0 reservedSize=0000000001FFFFD8 objectSizeAlignment=8
	#1 type=loh  base=0000027282C00028 size=0000000000050820 reservedSize=0000000001FFFFD8 objectSizeAlignment=8
	#2 type=soh2 base=0000027202170008 size=0000000000007020 reservedSize=00000000003FFFF8 objectSizeAlignment=8 // <=== here
	#3 type=soh2 base=0000027282800028 size=00000000000151B8 reservedSize=00000000003FFFD8 objectSizeAlignment=8
	#4 type=soh1 base=0000027282000028 size=0000000000000000 reservedSize=00000000003FFFD8 objectSizeAlignment=8
	#5 type=soh0 base=0000027284C00028 size=000000000010B0A0 reservedSize=00000000003FFFD8 objectSizeAlignment=8
	#6 type=foh  base=0000027202170008 size=0000000000007020 reservedSize=0000000000400000 objectSizeAlignment=8 // <=== here

Reproduction Steps

Application to reproduce the issue:

Console.WriteLine("Hello, World!");
Console.ReadLine();

Expected behavior

base=0000027202170008 size=0000000000007020 reservedSize=00000000003FFFF8

Actual behavior

base=0000027202170008 size=0000000000007020 reservedSize=0000000000400000

Regression?

No response

Known Workarounds

No response

Configuration

.NET 8.0-preview.5
Windows 10 Pro 22H2 x64

Other information

No response

Author:	ww898
Assignees:	-
Labels:	area-Diagnostics-coreclr, area-GC-coreclr
Milestone:	-

[cshung]

This work-in-progress PR #85727 will fix it.