[BOLT] DataAggregator support for binaries with multiple text segments #92815

paschalis-mpeis · 2024-05-20T19:46:01Z

When a binary has multiple text segments, the Size is computed as the
difference of the last address of these segments from the BaseAddress.
The base addresses of all text segments must be the same.

Background:
Larger binaries get two text segments mapped when loaded in memory.
BOLT processes only the first, which is not having a correct BaseAddress,
causing a wrong computation of a BinaryMMapInfo's size.

Consequently, BOLT wrongly thinks that many of the samples fall outside
the binary and ignores them. As a result, when used in heatmaps the
output excludes all those entries and the section hotness statistics are
wrong.

This bug is present in both the AArch64 and x86 backends.

This patch introduces the flag 'perf-script-events' that allows passing
perf events without BOLT having to parse them using 'perf script'.
The flag is used to pass a mock perf profile that has two memory
mappings for a mock binary that has two text segments. The size of the
mapping is updated as parseMMapEvents now processes all text segments.

Example used in unit tests:
From /proc/<BINARY PID>/maps, we have 2 text mappings, say A and B.

abc0000000-abc1000000 r-xp 011c0000 103:01 1573523 BINARY
abc2000000-abca000000 r-xp 031d0000 103:01 1573523 BINARY

Size of text mappings:

Mapping	Size
A	~15MB
B	~135MB

Example on a real program:

2f7200000-2fabca000 r--p 00000000        bolted-binary
2fabd9000-2fe47c000 r-xp 039c9000        bolted-binary <- 1st txt segment
2fe48b000-2fe61d000 r--p 0727b000        bolted-binary
2fe62c000-2fe660000 rw-p 0740c000        bolted-binary
2fe660000-2fea4c000 rw-p 00000000
2fec00000-303dad000 r-xp 07a00000        bolted-binary <- 2nd (appears only on the bolted binary)

llvmbot · 2024-05-20T19:46:22Z

@llvm/pr-subscribers-bolt

Author: Paschalis Mpeis (paschalis-mpeis)

Changes

DRAFT PR: This is WIP.

Needs:

Add context describing the issue
Add testing

In short, it improves heatmaps by:

Fixing a bug where the computation of a text section's size was wrong. As a result, running the heatmap tool on some bigger bolted binaries, the tool ignored most of the hits in hot/cold text segments.
Adding to the legend the mapping between the bucket letters to the actual text sections.

Full diff: https://github.com/llvm/llvm-project/pull/92815.diff

2 Files Affected:

(modified) bolt/lib/Profile/DataAggregator.cpp (+14-3)
(modified) bolt/lib/Profile/Heatmap.cpp (+11)

diff --git a/bolt/lib/Profile/DataAggregator.cpp b/bolt/lib/Profile/DataAggregator.cpp
index e06debcee741e..8d5b5531654cb 100644
--- a/bolt/lib/Profile/DataAggregator.cpp
+++ b/bolt/lib/Profile/DataAggregator.cpp
@@ -2009,8 +2009,9 @@ std::error_code DataAggregator::parseMMapEvents() {
       return MI.second.PID == FileMMapInfo.second.PID;
     });
 
-    if (PIDExists)
-      continue;
+    // let duplicates to the multimap.
+    // if (PIDExists)
+    //   continue;
 
     GlobalMMapInfo.insert(FileMMapInfo);
   }
@@ -2067,7 +2068,17 @@ std::error_code DataAggregator::parseMMapEvents() {
       }
     }
 
-    BinaryMMapInfo.insert(std::make_pair(MMapInfo.PID, MMapInfo));
+    // The mapping was already in place, but there are cases where the size
+    // is wrong. Fix it if needed.
+    if(!BinaryMMapInfo.insert(std::make_pair(MMapInfo.PID, MMapInfo)).second) {
+      auto EndAddress = MMapInfo.MMapAddress + MMapInfo.Size;
+      auto FixedSize = EndAddress - BinaryMMapInfo[MMapInfo.PID].BaseAddress;
+
+      if (FixedSize != BinaryMMapInfo[MMapInfo.PID].Size) {
+          outs() << "MMap size fixed: " << Twine::utohexstr(FixedSize) << " \n";
+         BinaryMMapInfo[MMapInfo.PID].Size = FixedSize;
+      }
+    }
   }
 
   if (BinaryMMapInfo.empty()) {
diff --git a/bolt/lib/Profile/Heatmap.cpp b/bolt/lib/Profile/Heatmap.cpp
index 210a5cc98c104..233b070bde2da 100644
--- a/bolt/lib/Profile/Heatmap.cpp
+++ b/bolt/lib/Profile/Heatmap.cpp
@@ -164,6 +164,7 @@ void Heatmap::print(raw_ostream &OS) const {
 
   // Print map legend
   OS << "Legend:\n";
+  OS << "\nRegions:\n";
   uint64_t PrevValue = 0;
   for (unsigned I = 0; I < sizeof(Range) / sizeof(Range[0]); ++I) {
     const uint64_t Value = Range[I];
@@ -173,6 +174,16 @@ void Heatmap::print(raw_ostream &OS) const {
     PrevValue = Value;
   }
 
+  {
+    OS << "\nSections:\n";
+    int Idx = 0;
+    for (auto TxtSeg : TextSections) {
+      OS << static_cast<char>('A' + ((Idx++) % 26)) << ": " << TxtSeg.Name
+         << ": 0x" <<  Twine::utohexstr(TxtSeg.BeginAddress) << "-0x"
+         << Twine::utohexstr(TxtSeg.EndAddress) << "\n";
+    }
+  }
+
   // Pos - character position from right in hex form.
   auto printHeader = [&](unsigned Pos) {
     OS << "            ";

github-actions · 2024-05-20T19:48:51Z

✅ With the latest revision this PR passed the C/C++ code formatter.

maksfb

Hi Paschalis, thanks for the PR. I think it applies to all binaries with multiple code segments and is a welcome fix. Can you think of the way to test it? I'm a bit confused regarding the comment about the incorrect BaseAddress, perhaps the test case will clarify it for me.

maksfb · 2024-08-14T07:05:59Z

bolt/lib/Profile/DataAggregator.cpp

@@ -2009,9 +2009,6 @@ std::error_code DataAggregator::parseMMapEvents() {
      return MI.second.PID == FileMMapInfo.second.PID;
    });


We no longer need the code above if we are tracking all mappings.

maksfb · 2024-08-14T07:11:02Z

bolt/lib/Profile/DataAggregator.cpp

@@ -2067,7 +2064,21 @@ std::error_code DataAggregator::parseMMapEvents() {
      }
    }

-    BinaryMMapInfo.insert(std::make_pair(MMapInfo.PID, MMapInfo));
+    // In some larger binaries, the loaded binary gets a a second text segment


Essentially, instead of storing the mapping for the first segment, you suggest to store the base address and the last address calculated as BaseAddress + Size, right? We will need to update the description of MMapInfo structure accordingly.

paschalis-mpeis · 2024-08-28T10:39:24Z

Hi @maksfb, thanks for your review.

I went with a unit test. Consider this as a starting point and feel free to suggest more changes.

In short:
I added a flag perf-script-events to bypass BOLT's 'perf script' processing,
and I use it to supply custom mmap event entries that demonstrate the problem.

I invoke preprocessProfile with the mock perf profile+binary and finally check the computed size. I needed to expose a const reference to BinaryMMapInfo for checking the size.

The unit test ignores some errors incurred by not supplying valid 'memory events' for irrelevant processing in preprocessProfile.

maksfb · 2024-10-08T22:19:08Z

bolt/lib/Profile/DataAggregator.cpp

@@ -464,6 +470,13 @@ void DataAggregator::filterBinaryMMapInfo() {

 int DataAggregator::prepareToParse(StringRef Name, PerfProcessInfo &Process,
                                   PerfProcessErrorCallbackTy Callback) {
+  if (!opts::ReadPerfEvents.empty()) {
+    dbgs() << "PERF2BOLT: using pre-processed perf events for '" << Name


Suggested change

dbgs() << "PERF2BOLT: using pre-processed perf events for '" << Name

outs() << "PERF2BOLT: using pre-processed perf events for '" << Name

maksfb

Thanks for adding the test!

Do you think we need to check that BaseAddress is calculated consistently across multiple segment mappings?

Please update comments on struct MMapInfo to reflect the effect of multiple segments.

paschalis-mpeis · 2024-11-05T09:17:45Z

Thanks Maks for your review.

That is a good idea. I've added an assertion to ensure BaseAddress consistency and a unit test for it.
I have also forced-push to rebase to latest main and changed the PR title.

paschalis-mpeis · 2024-11-06T11:01:55Z

Just pointing out that some tests are failing which are not related to this change or to BOLT (it's MLIR on Windows).
But if Meta has some further tests to run, it might be a good idea (I've saw this mentioned in other PRs).

paschalis-mpeis · 2024-11-18T10:06:54Z

Gentle ping. I think the PR addresses all comments. Do we need any more changes?

maksfb

Hi Paschalis, sorry for the delay. Looks good to me, but please address a few nits before committing.

maksfb · 2024-11-20T00:30:20Z

bolt/lib/Profile/DataAggregator.cpp

+      assert(MMapInfo.BaseAddress == BinaryMMapInfo[MMapInfo.PID].BaseAddress &&
+             "Base address on multiple segment mappings should match");
+
+    // Update section size.


Suggested change

// Update section size.

// Update mapping size.

maksfb · 2024-11-20T00:30:42Z

bolt/lib/Profile/DataAggregator.cpp

+    uint64_t EndAddress = MMapInfo.MMapAddress + MMapInfo.Size;
+    uint64_t Size = EndAddress - BinaryMMapInfo[MMapInfo.PID].BaseAddress;


Suggested change

uint64_t EndAddress = MMapInfo.MMapAddress + MMapInfo.Size;

uint64_t Size = EndAddress - BinaryMMapInfo[MMapInfo.PID].BaseAddress;

const uint64_t EndAddress = MMapInfo.MMapAddress + MMapInfo.Size;

const uint64_t Size = EndAddress - BinaryMMapInfo[MMapInfo.PID].BaseAddress;

maksfb · 2024-11-20T00:36:44Z

bolt/lib/Profile/DataAggregator.cpp

+cl::opt<std::string>
+    ReadPerfEvents("perf-script-events",
+                   cl::desc("skip perf event collection by supplying a "
+                            "perf-script output in a textual format"),
+                   cl::cat(AggregatorCategory));


If we don't expect the end user to see this option, let's make it cl::Hidden or cl::ReallyHidden. Alternatively, we can modify DataAggregator interface for testing since you don't invoke the option via CL.

maksfb · 2024-11-20T00:39:50Z

bolt/unittests/Core/MemoryMaps.cpp

@@ -0,0 +1,142 @@
+//===- bolt/unittest/Core/MemoryMaps.cpp -------------------------------===//


nit: adjust the line to end at 80 chars.

When a binary has multiple text segments, the Size is computed as the difference of the last address of these segments from the BaseAddress. The base addresses of all text segments must be the same. Background: Larger binaries get two text segments mapped when loaded in memory. BOLT processes only the first, which is not having a correct BaseAddress, causing a wrong computation of a BinaryMMapInfo's size. Consequently, BOLT wrongly thinks that many of the samples fall outside the binary and ignores them. As a result, when used in heatmaps the output excludes all those entries and the section hotness statistics are wrong. This bug is present in both the AArch64 and x86 backends. --- This patch introduces the flag 'perf-script-events' that allows passing perf events without BOLT having to parse them using 'perf script'. The flag is used to pass a mock perf profile that has two memory mappings for a mock binary that has two text segments. The size of the mapping is updated as `parseMMapEvents` now processes all text segments. --- Example used in unit tests: From `/proc/<BINARY PID>/maps`, we have 2 text mappings, say A and B. ``` abc0000000-abc1000000 r-xp 011c0000 103:01 1573523 BINARY abc2000000-abca000000 r-xp 031d0000 103:01 1573523 BINARY ``` Size of text mappings: | Mapping | Size | | ------- | ------ | | A | ~15MB | | B | ~135MB | --- Example on a real program: ``` 2f7200000-2fabca000 r--p 00000000 bolted-binary 2fabd9000-2fe47c000 r-xp 039c9000 bolted-binary <- 1st txt segment 2fe48b000-2fe61d000 r--p 0727b000 bolted-binary 2fe62c000-2fe660000 rw-p 0740c000 bolted-binary 2fe660000-2fea4c000 rw-p 00000000 2fec00000-303dad000 r-xp 07a00000 bolted-binary <- 2nd (appears only on the bolted binary) ```

- Added to CoreTests in BUILD.gn - Hiding DataAggregator std out/err outputs

Causes issues on the CI too.

paschalis-mpeis · 2024-11-21T10:59:34Z

Thanks for your review Maks. Addressed the nits and rebased to latest main to get the unrelated tests green.

I'll be merging this in a couple of working days, given no further comments from other reviewers.

llvm-ci · 2024-11-25T21:01:26Z

LLVM Buildbot has detected a new failure on builder lld-x86_64-win running on as-worker-93 while building bolt,llvm at step 7 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/146/builds/1688

Here is the relevant piece of the build log for the reference

Step 7 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM-Unit :: Support/./SupportTests.exe/37/87' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:C:\a\lld-x86_64-win\build\unittests\Support\.\SupportTests.exe-LLVM-Unit-19800-37-87.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=87 GTEST_SHARD_INDEX=37 C:\a\lld-x86_64-win\build\unittests\Support\.\SupportTests.exe
--

Script:
--
C:\a\lld-x86_64-win\build\unittests\Support\.\SupportTests.exe --gtest_filter=ProgramEnvTest.CreateProcessLongPath
--
C:\a\lld-x86_64-win\llvm-project\llvm\unittests\Support\ProgramTest.cpp(160): error: Expected equality of these values:
  0
  RC
    Which is: -2

C:\a\lld-x86_64-win\llvm-project\llvm\unittests\Support\ProgramTest.cpp(163): error: fs::remove(Twine(LongPath)): did not return errc::success.
error number: 13
error message: permission denied



C:\a\lld-x86_64-win\llvm-project\llvm\unittests\Support\ProgramTest.cpp:160
Expected equality of these values:
  0
  RC
    Which is: -2

C:\a\lld-x86_64-win\llvm-project\llvm\unittests\Support\ProgramTest.cpp:163
fs::remove(Twine(LongPath)): did not return errc::success.
error number: 13
error message: permission denied




********************

zmodem · 2024-11-26T13:55:21Z

We're hitting test failures after this on Linux. From a build directory:

$ cmake -GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=OFF -DLLVM_ENABLE_PROJECTS='clang;lld;bolt' -DLLVM_ENABLE_RUNTIMES=compiler-rt -DLLVM_TARGETS_TO_BUILD='AArch64;X86' ../llvm && ninja check-bolt
[...]
******************** TEST 'BOLT-Unit :: Core/./CoreTests/26/27' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/work/llvm-project/build.xx/tools/bolt/unittests/Core/./CoreTests-BOLT-Unit-989610-26-27.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=27 GTEST_SHARD_INDEX=26 /work/llvm-project/build.xx/tools/bolt/unittests/Core/./CoreTests
--

Script:
--
/work/llvm-project/build.xx/tools/bolt/unittests/Core/./CoreTests --gtest_filter=AArch64/MemoryMapsTester.MultipleSegmentsMismatchedBaseAddress/0
--
/work/llvm-project/bolt/unittests/Core/MemoryMaps.cpp:139: Failure
Death test: { Error Err = DA.preprocessProfile(*BC); }
    Result: failed to die.
 Error msg:
[  DEATH   ] BOLT-WARNING: build-id will not be checked because we could not read one from input binary
[  DEATH   ] Error reading BOLT data input file: line 4, column 5: expected decimal number
[  DEATH   ] Found: name
[  DEATH   ] PERF2BOLT: failed to parse samples
[  DEATH   ] Error reading BOLT data input file: line 4, column 10: expected decimal number
[  DEATH   ] Found: name
[  DEATH   ] PERF2BOLT: failed to parse memory events: Input/output error
[  DEATH   ] 


/work/llvm-project/bolt/unittests/Core/MemoryMaps.cpp:139
Death test: { Error Err = DA.preprocessProfile(*BC); }
    Result: failed to die.
 Error msg:
[  DEATH   ] BOLT-WARNING: build-id will not be checked because we could not read one from input binary
[  DEATH   ] Error reading BOLT data input file: line 4, column 5: expected decimal number
[  DEATH   ] Found: name
[  DEATH   ] PERF2BOLT: failed to parse samples
[  DEATH   ] Error reading BOLT data input file: line 4, column 10: expected decimal number
[  DEATH   ] Found: name
[  DEATH   ] PERF2BOLT: failed to parse memory events: Input/output error
[  DEATH   ] 



********************
********************
Failed Tests (2):
  BOLT-Unit :: Core/./CoreTests/AArch64/MemoryMapsTester/MultipleSegmentsMismatchedBaseAddress/0
  BOLT-Unit :: Core/./CoreTests/X86/MemoryMapsTester/MultipleSegmentsMismatchedBaseAddress/0


Testing Time: 3.13s

Total Discovered Tests: 489
  Skipped    :   7 (1.43%)
  Unsupported:  49 (10.02%)
  Passed     : 431 (88.14%)
  Failed     :   2 (0.41%)

Can you please take a look? I'll prepare a revert in the meantime.

… segments (#92815)" This caused test failures, see comment on the PR: Failed Tests (2): BOLT-Unit :: Core/./CoreTests/AArch64/MemoryMapsTester/MultipleSegmentsMismatchedBaseAddress/0 BOLT-Unit :: Core/./CoreTests/X86/MemoryMapsTester/MultipleSegmentsMismatchedBaseAddress/0 > When a binary has multiple text segments, the Size is computed as the > difference of the last address of these segments from the BaseAddress. > The base addresses of all text segments must be the same. > > Introduces flag 'perf-script-events' for testing. It allows passing perf events > without BOLT having to parse them using 'perf script'. The flag is used to > pass a mock perf profile that has two memory mappings for a mock binary > that has two text segments. The size of the mapping is updated as this > change `parseMMapEvents` processes all text segments. This reverts commit 4b71b37.

paschalis-mpeis · 2024-11-26T14:43:50Z

Hi Hans, thanks for reporting this.

Are these errors from an official buildbot?
I am asking as the error reported in the earlier comment seems unrelated.

zmodem · 2024-11-26T14:53:02Z

No, the error is from a local build. Agreed that the comment about https://lab.llvm.org/buildbot/#/builders/146/builds/1688 seems unrelated.

paschalis-mpeis added the BOLT label May 20, 2024

paschalis-mpeis force-pushed the users/paschalis-mpeis/bolt-heatmap-fix branch from c74aaf4 to ff020d9 Compare June 25, 2024 09:18

paschalis-mpeis changed the title ~~[BOLT] Heatmap fix on large binaries and printing mappings~~ [BOLT] Fix heatmaps on large BOLTE'd binaries. Jun 25, 2024

paschalis-mpeis changed the title ~~[BOLT] Fix heatmaps on large BOLTE'd binaries.~~ [BOLT] Fix heatmaps on large BOLTEd binaries. Jun 25, 2024

paschalis-mpeis marked this pull request as ready for review June 25, 2024 13:21

paschalis-mpeis requested review from aaupov, maksfb, rafaelauler, ayermolo and dcci as code owners June 25, 2024 13:22

maksfb reviewed Aug 14, 2024

View reviewed changes

paschalis-mpeis force-pushed the users/paschalis-mpeis/bolt-heatmap-fix branch from ff020d9 to d5a5aaa Compare August 28, 2024 09:52

paschalis-mpeis force-pushed the users/paschalis-mpeis/bolt-heatmap-fix branch from 946e149 to b1765dc Compare August 29, 2024 10:11

maksfb reviewed Oct 8, 2024

View reviewed changes

paschalis-mpeis force-pushed the users/paschalis-mpeis/bolt-heatmap-fix branch from b1765dc to 14cf49c Compare November 5, 2024 09:08

paschalis-mpeis changed the title ~~[BOLT] Fix heatmaps on large BOLTEd binaries.~~ [BOLT] DataAggregator supports binaries with multiple text segments Nov 5, 2024

paschalis-mpeis changed the title ~~[BOLT] DataAggregator supports binaries with multiple text segments~~ [BOLT] DataAggregator support for binaries with multiple text segments Nov 5, 2024

paschalis-mpeis requested a review from maksfb November 6, 2024 11:02

maksfb approved these changes Nov 20, 2024

View reviewed changes

paschalis-mpeis and others added 4 commits November 20, 2024 15:18

BOLT fails to read correctly the size of multi-segment mmaps.

4bdbb44

Attempt to fix build bot failures.

fdfc1ab

- Added to CoreTests in BUILD.gn - Hiding DataAggregator std out/err outputs

Addressing reviewers

52460e7

paschalis-mpeis added 2 commits November 20, 2024 15:18

No need to launch perf in the background.

16cf271

Causes issues on the CI too.

Addressing reviewers (2)

31e98b1

paschalis-mpeis force-pushed the users/paschalis-mpeis/bolt-heatmap-fix branch from 3fb0ca5 to 31e98b1 Compare November 21, 2024 10:07

paschalis-mpeis merged commit 4b71b37 into main Nov 25, 2024
8 checks passed

paschalis-mpeis deleted the users/paschalis-mpeis/bolt-heatmap-fix branch November 25, 2024 13:12

paschalis-mpeis mentioned this pull request Nov 28, 2024

Reapply [BOLT] DataAggregator support for binaries with multiple text segments #118023

Merged

		@@ -2009,9 +2009,6 @@ std::error_code DataAggregator::parseMMapEvents() {
		return MI.second.PID == FileMMapInfo.second.PID;
		});

	dbgs() << "PERF2BOLT: using pre-processed perf events for '" << Name
	outs() << "PERF2BOLT: using pre-processed perf events for '" << Name

		uint64_t EndAddress = MMapInfo.MMapAddress + MMapInfo.Size;
		uint64_t Size = EndAddress - BinaryMMapInfo[MMapInfo.PID].BaseAddress;

		@@ -0,0 +1,142 @@
		//===- bolt/unittest/Core/MemoryMaps.cpp -------------------------------===//

[BOLT] DataAggregator support for binaries with multiple text segments #92815

[BOLT] DataAggregator support for binaries with multiple text segments #92815

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DRAFT PR: This is WIP.

In short, it improves heatmaps by:

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