JIT: Avoid reporting call-sites in MinOpts on all targets #103950

jakobbotsch · 2024-06-25T09:07:44Z

When the call-sites have no interesting GC information we avoid reporting them, but this behavior was enabled only for x86/x64. Enable this on other platforms too.

Fix #103917

When the call-sites have no interesting GC information we avoid reporting them, but this behavior was enabled only for x86/x64. Enable this on other platforms too. Fix dotnet#103917

jakobbotsch · 2024-06-25T09:09:04Z

src/coreclr/jit/gcencode.cpp

@@ -4065,13 +4065,7 @@ void GCInfo::gcMakeRegPtrTable(
 {
    GCENCODER_WITH_LOGGING(gcInfoEncoderWithLog, gcInfoEncoder);

-    // TODO: Decide on whether we should enable this optimization for all
-    // targets: https://github.com/dotnet/runtime/issues/103917
-#ifdef TARGET_XARCH
    const bool noTrackedGCSlots = compiler->opts.MinOpts() && !compiler->opts.jitFlags->IsSet(JitFlags::JIT_FLAG_PREJIT);


@jkotas do you know if there is any dependency on the call site locations by crossgen2? I'm not sure if the PREJIT condition can also be removed here.

I do not think crossgen2 has any dependency on that. NativeAOT might have (unintentional) dependency on it - you may want to run NativeAOT outer loop.

The primary motivation for this feature was JIT throughput improvement. This condition is likely result of that thinking - spending the extra cycles for AOT is no big deal.

I do not see a problem with removing this condition.

The change in https://github.com/dotnet/runtime/pull/102680/files#r1653150895 may make us sensitive to missing safepoints.

Mostly just a matter of changing asserts though. We know the caller site is GC-safe. (since we are in a GC-capable callee)

Do you want me to revert the PREJIT change for now?

…call-sites

jakobbotsch · 2024-06-25T15:06:45Z

/azp run runtime-nativeaot-outerloop, runtime-coreclr gcstress0x3-gcstress0xc

azure-pipelines · 2024-06-25T15:07:05Z

Azure Pipelines successfully started running 2 pipeline(s).

jakobbotsch · 2024-07-09T11:40:18Z

/azp run runtime-nativeaot-outerloop

azure-pipelines · 2024-07-09T11:40:34Z

Azure Pipelines successfully started running 1 pipeline(s).

jakobbotsch · 2024-07-10T11:22:49Z

/azp run runtime-coreclr gcstress0x3-gcstress0xc

azure-pipelines · 2024-07-10T11:23:08Z

Azure Pipelines successfully started running 1 pipeline(s).

jakobbotsch · 2024-10-31T15:08:11Z

/azp run runtime-nativeaot-outerloop, runtime-coreclr gcstress0x3-gcstress0xc

azure-pipelines · 2024-10-31T15:08:35Z

Azure Pipelines successfully started running 2 pipeline(s).

jkotas · 2024-10-31T20:27:55Z

@VSadov Do we need to do any adjustments for native AOT?

Coverage for minopts + native AOT is likely very minimal, so I am not sure whether we can depend on tests to find all issues. @jakobbotsch It may be worth pushing a temporary change that unconditionally enables minopts for naot to see whether there are any real issues.

VSadov · 2024-10-31T20:37:03Z

I think NativeAOT at this point should be compatible with this change. This mostly affects decoder and that is shared.
I was waiting for gc stress tests to maybe find something.

It may be worth pushing a temporary change that unconditionally enables minopts for naot to see whether there are any real issues.

I think it would be interesting. Maybe we will find issues related to this change or even unrelated ones…

jakobbotsch · 2024-11-04T11:46:52Z

@jakobbotsch It may be worth pushing a temporary change that unconditionally enables minopts for naot to see whether there are any real issues.

Do you know what the simplest way to do that would be? I imagine I can't just do it on the JIT side due to IL scanner mismatches?

jkotas · 2024-11-04T17:56:49Z

You should be able to do it in the JIT. IL scanner is not aware of minopts vs. full opts differences. It has to assume the worst case. It has no control over when the JIT decides to degrade to minopts on its own.

jakobbotsch · 2024-11-05T10:13:17Z

Hmm, that didn't seem to work. Any other ideas?

jkotas · 2024-11-05T17:04:59Z

This shows that there are pre-existing issues with minopts and IL scanner. cc @MichalStrehovsky

MichalStrehovsky · 2024-11-06T06:02:29Z

This shows that there are pre-existing issues with minopts and IL scanner. cc @MichalStrehovsky

The scanner makes an assumption that NI_System_Runtime_InteropService_MemoryMarshal_GetArrayDataReference gets expanded. Submitted #109576 to make this easier to diagnose.

runtime/src/coreclr/tools/aot/ILCompiler.Compiler/IL/ILImporter.Scanner.cs

Lines 434 to 437 in 3116db9

    
           if (IsMemoryMarshalGetArrayDataReference(method)) 
        
           { 
        
               return; 
        
           }

If I mark this as betterToExpand in RyuJIT, smoke tests can build fine with this change. Any opinions on doing this unconditionally, or on native AOT only?

Smoke tests don't run with this change however, we're hitting assert(decoder.IsSafePoint()); in CoffNativeCodeManager.cpp so there's probably some problems.

VSadov · 2024-11-06T18:01:59Z

Smoke tests don't run with this change however, we're hitting assert(decoder.IsSafePoint()); in CoffNativeCodeManager.cpp so there's probably some problems.

This is a bit strange. This is an assert in a leaf frame checking that we were interrupted on a safe point.

This change indeed removes safe points from the GC info, but then how could the execution be interrupted if the safe point is missing?

VSadov · 2024-11-06T18:05:41Z

but then how could the execution be interrupted if the safe point is missing?

Ah, yes, it could be interrupted via hijacking.
The assert should be changed to assert(decoder.CouldBeInterruptibleSafePoint()

The helper was specifically introduced to be more permissive in asserts and allow cases where safepoints are possibly missing due to MinOpts.

jkotas · 2024-11-06T22:31:26Z

If I mark this as betterToExpand in RyuJIT, smoke tests can build fine with this change. Any opinions on doing this unconditionally, or on native AOT only?

I think we should do it unconditionally. (It would be more correct to treat it as mustToExpand, but we seem to depend on betterToExpand to mean mustToExpand with IL scanner for other methods, so it is not introducing a new fundamental problem.)

@jakobbotsch Are you fine with doing this and the change that @VSadov suggested in this PR, or would you like those changes to be submitted separately?

jakobbotsch · 2024-11-07T10:33:50Z

@jakobbotsch Are you fine with doing this and the change that @VSadov suggested in this PR, or would you like those changes to be submitted separately?

I think we should fix the ILScanner/GetArrayDataReference issue separately since it's not really related to this change, but @VSadov's issue seems related so makes sense to fix it here.

If you think we should expand this unconditionally the intrinsic should just be made recursive in the C# sources, right? (Hmm, no.. we don't really have prior art to unconditionally expanded intrinsics in callers outside of NAOT. I would probably suggest we just add this one to the list of ones expanded for NAOT.)

…call-sites

jakobbotsch · 2024-11-14T11:09:37Z

/azp run runtime-nativeaot-outerloop

azure-pipelines · 2024-11-14T11:09:55Z

Azure Pipelines successfully started running 1 pipeline(s).

JIT: Avoid reporting call-sites in MinOpts on all targets

4c20c15

When the call-sites have no interesting GC information we avoid reporting them, but this behavior was enabled only for x86/x64. Enable this on other platforms too. Fix dotnet#103917

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Merge branch 'main' of github.com:dotnet/runtime into minopts-report-…

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…call-sites

No tracked GC slots even when prejitting MinOpts

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[NativeAOT] Adding CET support #102680

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The Operation will be canceled. The next steps may not contain expected logs. dotnet/dnceng#3008

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Revert "Do not encode safe points with -1 offset. (#104336)" #105234

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Merge branch 'main' into minopts-report-call-sites

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Merge branch 'main' into minopts-report-call-sites

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Force MinOpts for NAOT

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jakobbotsch mentioned this pull request Nov 7, 2024

JIT: Mark some intrinsics as must-expand for NAOT due to ILScanner dependencies #109609

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Merge branch 'main' of github.com:dotnet/runtime into minopts-report-…

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…call-sites

IsSafePoint -> CouldBeSafePoint

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jakobbotsch requested a review from MichalStrehovsky as a code owner November 11, 2024 16:22

Fix in Unix version too

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JIT: Avoid reporting call-sites in MinOpts on all targets #103950

JIT: Avoid reporting call-sites in MinOpts on all targets #103950

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