Heatmaps and Native memory profiling

v4.0

Features

• async-profiler#895, async-profiler#905: jfrconv binary and numerous converter enhancements
• async-profiler#944: Interactive Heatmap
• async-profiler#1064: Native memory leak profiler
• async-profiler#1002: An option to display instruction addresses
• async-profiler#1007: Optimize wall clock profiling
• async-profiler#1073: Productize VMStructs-based stack walker: --cstack vm/vmx
• async-profiler#1169: C API for accessing thread-local profiling context

Improvements

• async-profiler#923: Support JDK 23+
• async-profiler#952: Solve musl and glibc compatibility issues; link libstdc++ statically
• async-profiler#955: --libpath option to specify path to libasyncProfiler.so in a container
• async-profiler#1018: --grain converter option to coarsen flame graphs
• async-profiler#1046: --nostop option to continue profiling outside --begin/--end window
• async-profiler#1178: --inverted option to flip flame graphs vertically
• async-profiler#1009: Allows collecting allocation and live object traces at the same time
• async-profiler#925: An option to accumulate JFR events in memory instead of flushing to a file
• async-profiler#929: Load symbols from debuginfod cache
• async-profiler#982: Sample contended locks by overflowing interval bucket
• async-profiler#993: Filter native frames in allocation profile
• async-profiler#896: FlameGraph: Alt+Click to remove stacks
• async-profiler#1097: FlameGraph: N/Shift+N to navigate through search results
• async-profiler#1182: Retain by-thread grouping when reversing FlameGraph
• async-profiler#1167: Log when no samples are collected
• async-profiler#1044: Fall back to ctimer for CPU profiling when perf_events are unavailable
• async-profiler#1068: Count missed samples when estimating total CPU time in ctimer mode
• async-profiler#1142: Use counter-timer register for timestamps on ARM64
• async-profiler#1123: Support clock=tsc without a JVM
• async-profiler#1070: Demangle Rust v0 symbols
• async-profiler#1007: Use ExecutionSample event for CPU profiling and WallClockSample for Wall clock profiling
• async-profiler#1011: Obtain can_generate_sampled_object_alloc_events JVMTI capability only when needed
• async-profiler#1013: Intercept java.util.concurrent locks more efficiently
• async-profiler#759: Discover available profiling signal automatically
• async-profiler#884: Record event timestamps early
• async-profiler#885: Print error message if JVM fails to load libasyncProfiler
• async-profiler#892: Resolve tracepoint id in asprof
• Suppress dynamic attach warning on JDK 21+

Bug fixes

• async-profiler#1143: Crash on macOS when using thread filter
• async-profiler#1125: Fixed parsing concurrently loaded libraries
• async-profiler#1095: jfr print fails when a recording has empty pools
• async-profiler#1084: Fixed Logging related races
• async-profiler#1074: Parse both .rela.dyn and .rela.plt sections
• async-profiler#1003: Support both tracefs and debugfs for kernel tracepoints
• async-profiler#986: Profiling output respects loglevel
• async-profiler#981: Avoid JVM crash by deleting JNI refs after GetMethodDeclaringClass
• async-profiler#934: Fix crash on Zing in a native thread
• async-profiler#843: Fix race between parsing and concurrent unloading of shared libraries
• async-profiler#1147, async-profiler#1151: Deadlocks with jemalloc and tcmalloc profilers
• Stack walking fixes for ARM64
• Converter fixes for jfrsync profiles
• Fixed parsing non-PIC executables and shared objects with non-standard section layout
• Fixed recursion in pthread_create when using native profiling API
• Fixed crashes on Alpine when profiling native apps
• Fixed warnings with -Xcheck:jni
• Fixed "Unsupported JVM" on OpenJ9 JDK 21
• Fixed DefineClass crash on OpenJ9
• JfrReader should handle custom events properly
• Handle truncated JFRs

Project Infrastructure

• Restructure and update documentation
• Implement test framework; add new integration tests
• Unit test framework for C++ code
• Run CI on all supported platforms
• Test multiple JDK versions in CI
• Add GHA to validate license headers
• Add Markdown checker and formatter
• Add Issue and Pull Request templates
• Add Contributing Guidelines and Code of Conduct
• Run static analyzer and fix found issues (async-profiler#1034, async-profiler#1039, async-profiler#1049, async-profiler#1051, async-profiler#1098)
• Provide Dockerfile for building async-profiler release packages
• Publish nightly builds automatically