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llvm-project/llvm/tools/llvm-exegesis
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Aiden Grossman 1e8df9e85a
[llvm-exegesis] Use correct rseq struct size (#100804) 
Glibc v2.40 changes the definition of __rseq_size to the usable area of
the struct rather than the actual size of the struct to accommodate
users trying to figure out what features can be used. This change breaks
llvm-exegesis trying to disable rseq as the size registered in the
kernel is no longer equal to __rseq_size. This patch adds a check to see
if __rseq_size is less than 32 bytes and uses 32 as a value if it is
given alignment requirements.

Fixes #100791.
2024-07-27 10:53:23 -07:00
..
lib
[llvm-exegesis] Use correct rseq struct size (#100804)
2024-07-27 10:53:23 -07:00
CMakeLists.txt
[llvm-exegesis] Fix typos in cmake file
2024-06-14 14:50:25 +02:00
llvm-exegesis.cpp
[llvm-exegesis] Only link/initialize supported targets (NFC) (#95421)
2024-06-14 09:39:15 +02:00
README.md
[llvm-exegesis] Fix typos in README
2024-02-24 08:32:17 +00:00

README.md

llvm-exegesis

llvm-exegesis is a benchmarking tool that accepts or generates snippets and can measure characteristics of those snippets by executing it while keeping track of performance counters.

Currently Supported Platforms

llvm-exegesis is quite platform-dependent and currently only supports a couple platform configurations for benchmarking. The limitations are listed below. Analysis mode in llvm-exegesis is supported on all platforms on which LLVM is.

Currently Supported Operating Systems for Benchmarking

Currently, llvm-exegesis only supports benchmarking on Linux. This is mainly due to a dependency on the Linux perf subsystem for reading performance counters.

The subprocess execution mode and memory annotations currently only supports Linux due to a heavy reliance on many Linux specific syscalls/syscall implementations.

Currently Supported Architectures for Benchmarking

Currently, using llvm-exegesis for benchmarking is supported on the following architectures:

  • x86
    • 64-bit only due to this being the only implemented calling convention in llvm-exegesis currently.
  • ARM
    • AArch64 only
  • MIPS
  • PowerPC (PowerPC64LE only)

Note that not all benchmarking functionality is guaranteed to work on all platforms.

Memory annotations are currently only supported on 64-bit X86. There is no inherent limitations for porting memory annotations to other architectures, but parts of the test harness are implemented as MCJITed assembly that is generated in ./lib/X86/Target.cpp that would need to be implemented on other architectures to bring up support.