[llvm-profgen] Extend llvm-profgen to generate vtable profiles with data access events. #148013

mingmingl-llvm · 2025-07-10T17:53:48Z

An RFC is in https://discourse.llvm.org/t/rfc-vtable-type-profiling-for-samplefdo/87283

This change extends to process perf data with Intel MEM_INST_RETIRED.ALL_LOADS samples and produce sample profiles with vtable information for non context-sensitive SampleFDO profiles.

For feature parity across different hardwares, future work could incorporate support for AMD Instruction-Based Sampling (IBS) and Arm Statistical Profiling Extension (SPE).

…enerate vtable profiles for non context-sensitive AFDO profiles

llvmbot · 2025-07-10T22:48:55Z

@llvm/pr-subscribers-pgo

Author: Mingming Liu (mingmingl-llvm)

Changes

An RFC is in https://discourse.llvm.org/t/rfc-vtable-type-profiling-for-samplefdo/87283

This change extends to process perf data with Intel MEM_INST_RETIRED.ALL_LOADS samples and produce sample profiles with vtable information for non context-sensitive SampleFDO profiles.

For feature parity across different hardwares, future work could incorporate support for AMD Instruction-Based Sampling (IBS) and Arm Statistical Profiling Extension (SPE).

Patch is 186.37 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/148013.diff

10 Files Affected:

(added) llvm/test/tools/llvm-profgen/Inputs/dap-perf-trace.txt (+37)
(added) llvm/test/tools/llvm-profgen/Inputs/dap.perfbin ()
(added) llvm/test/tools/llvm-profgen/Inputs/lbr-perf-for-dap.script (+175)
(added) llvm/test/tools/llvm-profgen/afdo-with-vtable.test (+18)
(modified) llvm/tools/llvm-profgen/PerfReader.cpp (+68-4)
(modified) llvm/tools/llvm-profgen/PerfReader.h (+21-13)
(modified) llvm/tools/llvm-profgen/ProfileGenerator.cpp (+16)
(modified) llvm/tools/llvm-profgen/ProfiledBinary.cpp (+40)
(modified) llvm/tools/llvm-profgen/ProfiledBinary.h (+35)
(modified) llvm/tools/llvm-profgen/llvm-profgen.cpp (+12)

diff --git a/llvm/test/tools/llvm-profgen/Inputs/dap-perf-trace.txt b/llvm/test/tools/llvm-profgen/Inputs/dap-perf-trace.txt
new file mode 100644
index 0000000000000..28f15b1ff199d
--- /dev/null
+++ b/llvm/test/tools/llvm-profgen/Inputs/dap-perf-trace.txt
@@ -0,0 +1,37 @@
+0 0x7b10 [0x88]: PERF_RECORD_MMAP2 3446532/3446532: [0x200000(0x60000) @ 0 08:01 527501 0]: r--p /path/to/dap.perfbin
+0 0x7b98 [0x88]: PERF_RECORD_MMAP2 3446532/3446532: [0x260000(0x153000) @ 0x5f000 08:01 527501 0]: r-xp /path/to/dap.perfbin
+0 0x7c20 [0x88]: PERF_RECORD_MMAP2 3446532/3446532: [0x3b3000(0xc000) @ 0x1b1000 08:01 527501 0]: r--p /path/to/dap.perfbin
+0 0x7ca8 [0x88]: PERF_RECORD_MMAP2 3446532/3446532: [0x3bf000(0x3000) @ 0x1bc000 08:01 527501 0]: rw-p /path/to/dap.perfbin
+1282514021937402 0x8660 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3f70
+1282514022939813 0x87b0 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3fb0
+1282514023932029 0x8a00 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3fb0
+1282514024937981 0x8d48 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3fb0
+1282514028925828 0x94c0 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3fb0
+1282514028934870 0x9678 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608ac period: 233 addr: 0x3b3fc0
+1282514029934094 0x9830 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3fb0
+1282514040934785 0xb1d0 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608ac period: 233 addr: 0x3b3fc0
+1282514052924510 0xcbb8 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3f70
+1282514053932406 0xcfb0 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608ac period: 233 addr: 0x3b3fc0
+1282514063928248 0xe5c8 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3f70
+1282514073928057 0xfd20 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3f70
+1282514081925013 0x10f28 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3f70
+1282514084927335 0x11678 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3f70
+1282514088926926 0x11f90 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3f70
+1282514089929492 0x12270 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3f70
+1282514119919997 0x16610 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3f70
+1282514120924169 0x16920 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3f70
+1282514145923603 0x1a338 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3f70
+1282514146917708 0x1a428 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3f70
+1282514173914003 0x1e1b0 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3f70
+1282514188915199 0x20488 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3f70
+1282514210915866 0x236d8 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3f70
+1282514212908181 0x23a50 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3f70
+1282514480886012 0x4a098 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608ac period: 233 addr: 0x3b3f80
+1282514840855333 0x7dd48 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608ac period: 233 addr: 0x3b3f80
+1282514955835364 0x8e380 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608ac period: 233 addr: 0x3b3f80
+1282514967839429 0x8fef8 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608ac period: 233 addr: 0x3b3f80
+1282515023830209 0x97f98 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608ac period: 233 addr: 0x3b3f80
+1282515356804308 0xc7b28 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608ac period: 233 addr: 0x3b3f80
+1282515410794371 0xcf590 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608ac period: 233 addr: 0x3b3f80
+1282515541786485 0xe2280 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608ac period: 233 addr: 0x3b3f80
+1282515703761203 0xf93c0 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002): 3446532/3446532: 0x2608ac period: 233 addr: 0x3b3f80
diff --git a/llvm/test/tools/llvm-profgen/Inputs/dap.perfbin b/llvm/test/tools/llvm-profgen/Inputs/dap.perfbin
new file mode 100755
index 0000000000000..e69de29bb2d1d
diff --git a/llvm/test/tools/llvm-profgen/Inputs/lbr-perf-for-dap.script b/llvm/test/tools/llvm-profgen/Inputs/lbr-perf-for-dap.script
new file mode 100644
index 0000000000000..34a2f5121b3c6
--- /dev/null
+++ b/llvm/test/tools/llvm-profgen/Inputs/lbr-perf-for-dap.script
@@ -0,0 +1,175 @@
+PERF_RECORD_MMAP2 3446532/3446532: [0x260000(0x153000) @ 0x5f000 08:01 527501 0]: r-xp /path/to/dap.perfbin
+PERF_RECORD_MMAP2 3446532/3446532: [0x7fff5ff28000(0x2000) @ 0 00:00 0 0]: r-xp [vdso]
+PERF_RECORD_MMAP2 3446532/3446532: [0xffffffffff600000(0x1000) @ 0 00:00 0 0]: --xp [vsyscall]
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[truncated]

snehasish

Mostly cosmetic comments..

llvm/tools/llvm-profgen/PerfReader.cpp

llvm/tools/llvm-profgen/PerfReader.h

snehasish · 2025-07-16T20:43:19Z

llvm/tools/llvm-profgen/PerfReader.h

+
+  // Parse a single line of a PERF_RECORD_MMAP event looking for a
+  // mapping between the binary name and its memory layout.
+  static bool extractMMapEventForBinary(ProfiledBinary *Binary, StringRef Line,


It's a bit strange to use a static method from the inherited class in the base class. Can you make this a base class method and update the usage?

Sure. How does it sound if I do this in a separate change to minimize the code diff? Added a TODO in the comment if that's fine.

Sounds good to cleanup after.

llvm/tools/llvm-profgen/ProfiledBinary.h

llvm/tools/llvm-profgen/PerfReader.cpp

snehasish · 2025-07-16T21:18:14Z

llvm/test/tools/llvm-profgen/afdo-with-vtable.test

@@ -0,0 +1,18 @@
+RUN: llvm-profgen --perfscript=%p/Inputs/lbr-perf-for-dap.script --data-access-profile=%p/Inputs/dap-perf-trace.txt \
+RUN:  --binary=%p/Inputs/dap.perfbin --format=text --pid=3446532 \


Maybe rename dap.perfbin to just dap.bin. perfbin made me think that it was the binary file obtained from the perf record command.

done.

Somehow my previous commit left the dap.bin executable as an empty file. Luckily I found the executable in one of the working directory so just copied it here.

llvm/tools/llvm-profgen/PerfReader.h

llvm/tools/llvm-profgen/ProfileGenerator.cpp

mingmingl-llvm

thanks for reviews! PTAL.

mingmingl-llvm · 2025-07-18T17:24:57Z

llvm/tools/llvm-profgen/llvm-profgen.cpp

@@ -67,6 +67,11 @@ static cl::opt<std::string> DebugBinPath(
             "from it instead of the executable binary."),
    cl::cat(ProfGenCategory));

+static cl::opt<std::string> DataAccessProfileFilename(
+    "data-access-profile", cl::value_desc("data-access-profile"),
+    cl::desc("Path of the data access profile to be generated."),


mingmingl-llvm · 2025-07-18T17:47:00Z

llvm/tools/llvm-profgen/ProfiledBinary.h

+  }
+
+  // Given a runtime address, canonicalize it to the virtual address in the
+  // binary.


Updated the comment to mention 'non-text' and added a TODO to consider unifying text vs non-text. I think it should be possible to do some refactoring, but not sure if we can completely get rid of a data-vs-text hint from caller side (e.g. executable's linking option may affect the code/data to segment mapping).

llvm/tools/llvm-profgen/ProfiledBinary.h

mingmingl-llvm · 2025-07-18T17:54:38Z

llvm/tools/llvm-profgen/ProfiledBinary.cpp

+      Symbolizer->symbolizeData(SymbolizerPath.str(), {Address, 0}),
+      SymbolizerPath);
+  auto It = NameStrings.insert(DataDIGlobal.Name);
+  return StringRef(*It.first);


hmm not really. The original It is actually of type pair<decltype(NameStrings)::iterator, bool>, I revised the code slightly to make the types and names more explicit.

mingmingl-llvm · 2025-07-18T19:09:53Z

llvm/tools/llvm-profgen/ProfiledBinary.cpp

@@ -946,6 +978,14 @@ SampleContextFrameVector ProfiledBinary::symbolize(const InstructionPointer &IP,
  return CallStack;
 }

+StringRef ProfiledBinary::symbolizeDataAddress(uint64_t Address) {
+  DIGlobal DataDIGlobal = unwrapOrError(
+      Symbolizer->symbolizeData(SymbolizerPath.str(), {Address, 0}),


LLVMSymbolizer's symbolize* interfaces [1] require a struct of object::SectionedAddress [2] to symbolize an address, like, they don't take an integer of address alone. Chasing down the calls [3], sectionIndex field isn't used so its value doesn't matter [4].

Upon this question, it's better to use UndefSection [5] here. Added a static helper function getSectionedAddress for this purpose, and use it for both code and data inside ProfiledBinary class.

[1] for data and code

[2]

llvm-project/llvm/include/llvm/Object/ObjectFile.h

Lines 146 to 151 in 13f7786

struct SectionedAddress {

const static uint64_t UndefSection = UINT64_MAX;

uint64_t Address = 0;

uint64_t SectionIndex = UndefSection;

};

[3]

llvm-project/llvm/lib/DebugInfo/Symbolize/Symbolize.cpp

Lines 155 to 178 in 13f7786

LLVMSymbolizer::symbolizeDataCommon(const T &ModuleSpecifier,

object::SectionedAddress ModuleOffset) {

auto InfoOrErr = getOrCreateModuleInfo(ModuleSpecifier);

if (!InfoOrErr)

return InfoOrErr.takeError();

SymbolizableModule *Info = *InfoOrErr;

// A null module means an error has already been reported. Return an empty

// result.

if (!Info)

return DIGlobal();

// If the user is giving us relative addresses, add the preferred base of

// the object to the offset before we do the query. It's what DIContext

// expects.

if (Opts.RelativeAddresses)

ModuleOffset.Address += Info->getModulePreferredBase();

DIGlobal Global = Info->symbolizeData(ModuleOffset);

if (Opts.Demangle)

Global.Name = DemangleName(Global.Name, Info);

return Global;

}

[4]

llvm-project/llvm/lib/DebugInfo/DWARF/DWARFContext.cpp

Lines 1753 to 1766 in 13f7786

std::optional<DILineInfo>

DWARFContext::getLineInfoForDataAddress(object::SectionedAddress Address) {

DILineInfo Result;

DWARFCompileUnit *CU = getCompileUnitForDataAddress(Address.Address);

if (!CU)

return Result;

if (DWARFDie Die = CU->getVariableForAddress(Address.Address)) {

Result.FileName = Die.getDeclFile(FileLineInfoKind::AbsoluteFilePath);

Result.Line = Die.getDeclLine();

}

return Result;

}

[5]

llvm-project/llvm/include/llvm/Object/ObjectFile.h

Lines 146 to 147 in 13f7786

struct SectionedAddress {

const static uint64_t UndefSection = UINT64_MAX;

llvm/tools/llvm-profgen/PerfReader.cpp

mingmingl-llvm · 2025-07-18T21:39:00Z

llvm/test/tools/llvm-profgen/afdo-with-vtable.test

@@ -0,0 +1,18 @@
+RUN: llvm-profgen --perfscript=%p/Inputs/lbr-perf-for-dap.script --data-access-profile=%p/Inputs/dap-perf-trace.txt \
+RUN:  --binary=%p/Inputs/dap.perfbin --format=text --pid=3446532 \


done.

Somehow my previous commit left the dap.bin executable as an empty file. Luckily I found the executable in one of the working directory so just copied it here.

mingmingl-llvm · 2025-07-18T21:42:31Z

llvm/tools/llvm-profgen/PerfReader.h

+
+  // Parse a single line of a PERF_RECORD_MMAP event looking for a
+  // mapping between the binary name and its memory layout.
+  static bool extractMMapEventForBinary(ProfiledBinary *Binary, StringRef Line,


Sure. How does it sound if I do this in a separate change to minimize the code diff? Added a TODO in the comment if that's fine.

snehasish

A couple of requests regarding testing --

I think the current dap.bin is non-PIE, can you add a PIE variant test case too?
Can you trim the lbr-perf-for-dap.script test input to preserve only whats needed for a minimal test. I think a lot of the samples are repeated and we can just test for a lower count.

snehasish · 2025-07-18T22:08:50Z

llvm/tools/llvm-profgen/PerfReader.cpp

+  // A perf_record_sample line is like
+  // . 1282514022939813 0x87b0 [0x60]: PERF_RECORD_SAMPLE(IP, 0x4002):
+  // 3446532/3446532: 0x2608a2 period: 233 addr: 0x3b3fb0
+  constexpr static const char *const DataAccessSamplePattern =


Can this be constexpr StringRef DataAccessSamplePattern = ...?

snehasish · 2025-07-18T22:13:02Z

llvm/tools/llvm-profgen/PerfReader.cpp

+    SmallVector<StringRef> Fields;
+    if (logRegex.match(Line, &Fields)) {
+      int32_t PID = 0;
+      Fields[1].getAsInteger(0, PID);


We know the radix in the format so let's not do additional work to infer it each time and pass it in as the first argument. Also check the return bool here in there is malformed input?

Same for the getAsInteger call below.

snehasish · 2025-07-18T22:14:19Z

llvm/tools/llvm-profgen/PerfReader.h

+
+  // Parse a single line of a PERF_RECORD_MMAP event looking for a
+  // mapping between the binary name and its memory layout.
+  static bool extractMMapEventForBinary(ProfiledBinary *Binary, StringRef Line,


Sounds good to cleanup after.

Extend llvm-profgen to process Intel MEM_INST_RETIRED.ALL_LOADS and g…

170d152

…enerate vtable profiles for non context-sensitive AFDO profiles

mingmingl-llvm requested review from snehasish, wlei-llvm, teresajohnson, modiking, david-xl and WenleiHe July 10, 2025 22:47

mingmingl-llvm marked this pull request as ready for review July 10, 2025 22:48

llvmbot added the PGO Profile Guided Optimizations label Jul 10, 2025

WenleiHe requested a review from apolloww July 16, 2025 05:42

snehasish reviewed Jul 16, 2025

View reviewed changes

mingmingl-llvm added 2 commits July 18, 2025 10:24

fix file dap.perfbin

1012575

resolve comments

870d957

mingmingl-llvm commented Jul 18, 2025

View reviewed changes

snehasish reviewed Jul 18, 2025

View reviewed changes

		@@ -0,0 +1,18 @@
		RUN: llvm-profgen --perfscript=%p/Inputs/lbr-perf-for-dap.script --data-access-profile=%p/Inputs/dap-perf-trace.txt \
		RUN: --binary=%p/Inputs/dap.perfbin --format=text --pid=3446532 \

	struct SectionedAddress {
	const static uint64_t UndefSection = UINT64_MAX;

	uint64_t Address = 0;
	uint64_t SectionIndex = UndefSection;
	};

	LLVMSymbolizer::symbolizeDataCommon(const T &ModuleSpecifier,
	object::SectionedAddress ModuleOffset) {

	auto InfoOrErr = getOrCreateModuleInfo(ModuleSpecifier);
	if (!InfoOrErr)
	return InfoOrErr.takeError();

	SymbolizableModule Info = InfoOrErr;
	// A null module means an error has already been reported. Return an empty
	// result.
	if (!Info)
	return DIGlobal();

	// If the user is giving us relative addresses, add the preferred base of
	// the object to the offset before we do the query. It's what DIContext
	// expects.
	if (Opts.RelativeAddresses)
	ModuleOffset.Address += Info->getModulePreferredBase();

	DIGlobal Global = Info->symbolizeData(ModuleOffset);
	if (Opts.Demangle)
	Global.Name = DemangleName(Global.Name, Info);
	return Global;
	}

	std::optional<DILineInfo>
	DWARFContext::getLineInfoForDataAddress(object::SectionedAddress Address) {
	DILineInfo Result;
	DWARFCompileUnit *CU = getCompileUnitForDataAddress(Address.Address);
	if (!CU)
	return Result;

	if (DWARFDie Die = CU->getVariableForAddress(Address.Address)) {
	Result.FileName = Die.getDeclFile(FileLineInfoKind::AbsoluteFilePath);
	Result.Line = Die.getDeclLine();
	}

	return Result;
	}

[llvm-profgen] Extend llvm-profgen to generate vtable profiles with data access events. #148013

Are you sure you want to change the base?

[llvm-profgen] Extend llvm-profgen to generate vtable profiles with data access events. #148013

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mingmingl-llvm commented Jul 10, 2025 •

edited

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