Commits on Feb 20, 2020

1. Adds perf jitdump support …

   Patch adds support for the perf jitdump file specification.
   With this patch it should be possible to see profile data for code
   generated and maped at runtime. Specifically the patch adds support
   for the JIT_CODE_LOAD and the JIT_DEBUG_INFO record as described in
   the specification. Dumping jitfiles is enabled with the --jitdump
   flag. When the -g flag is also used there is an attempt to dump file
   and line number information where this option would be most useful
   when the WASM file already includes DWARF debug information.
   
   The generation of the jitdump files has been tested on only a few wasm
   files. This patch is expected to be useful/serviceable where currently
   there is no means for jit profiling, but future patches may benefit
   line mapping and add support for additional jitdump record types.
   
   Usage Example:
   Record
     sudo perf record -k 1 -e instructions:u target/debug/wasmtime -g
     --jitdump test.wasm
   Combine
     sudo perf inject -v -j -i perf.data -o perf.jit.data
   Report
     sudo perf report -i perf.jit.data -F+period,srcline

   

   jlb6740 committed Feb 20, 2020
   Configuration menu

   • View commit details
   • Copy full SHA for b070011
   • Browse repository at this point

   Copy the full SHA

   b070011 View commit details

   Browse the repository at this point in the history