YJIT: add heuristic to avoid compiling cold ISEQs (#8522)

* YJIT: Add counter to measure how often we compile "cold" ISEQs (#535)

Fix counter name in DEFAULT_COUNTERS

YJIT: add --yjit-cold-threshold, don't compile cold ISEQs

YJIT: increase default cold threshold to 200_000

Remove rb_yjit_call_threshold()

Remove conflict markers

Fix compilation errors

Threshold 1 should compile immediately

Debug deadlock issue with test_ractor

Fix call threshold issue with tests

* Revert exception threshold logic. Document option in yjid.md

* (void) for 0 parameter functions in C99

* Rename iseq_entry_cold => cold_iseq_entry

* Document --yjit-cold-threshold in ruby.c

* Update doc/yjit/yjit.md

Co-authored-by: Jean byroot Boussier <[email protected]>

* Shorten help string to appease test

* Address bug found by Kokubun. Reorder logic.

---------

Co-authored-by: Alan Wu <[email protected]>
Co-authored-by: Jean byroot Boussier <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/ruby.c b/ruby.c
index 379f76c577..44b1e06031 100644
--- a/ruby.c
+++ b/ruby.c
@@ -374,6 +374,7 @@ usage(const char *name, int help, int highlight, int columns)
         M("--yjit-trace-exits-sample-rate",  "", "Trace exit locations only every Nth occurrence"),
         M("--yjit-exec-mem-size=num",        "", "Size of executable memory block in MiB (default: 128)"),
         M("--yjit-call-threshold=num",       "", "Number of calls to trigger JIT (default: 30)"),
+        M("--yjit-cold-threshold=num",       "", "Global call after which ISEQs not compiled (default: 200K)"),
         M("--yjit-max-versions=num",         "", "Maximum number of versions per basic block (default: 4)"),
         M("--yjit-greedy-versioning",        "", "Greedy versioning mode (default: disabled)"),
     };