YJIT: add iseq_alloc_count to stats (#10398)

* YJIT: add iseq_alloc_count to stats

* Remove an empty line

---------

Co-authored-by: Takashi Kokubun <takashikkbn@gmail.com>

Author: maximecb

compile.c

@@ -999,6 +999,7 @@ rb_iseq_translate_threaded_code(rb_iseq_t *iseq)
 
 #if USE_YJIT
     rb_yjit_live_iseq_count++;
+    rb_yjit_iseq_alloc_count++;
 #endif
 
     return COMPILE_OK;

yjit.h

@@ -28,6 +28,7 @@
 extern uint64_t rb_yjit_call_threshold;
 extern uint64_t rb_yjit_cold_threshold;
 extern uint64_t rb_yjit_live_iseq_count;
+extern uint64_t rb_yjit_iseq_alloc_count;
 extern bool rb_yjit_enabled_p;
 void rb_yjit_incr_counter(const char *counter_name);
 void rb_yjit_invalidate_all_method_lookup_assumptions(void);

yjit.rb

@@ -346,6 +346,7 @@ def _print_stats(out: $stderr) # :nodoc:
       out.puts "bindings_set:          " + format_number(13, stats[:binding_set])
       out.puts "compilation_failure:   " + format_number(13, compilation_failure) if compilation_failure != 0
       out.puts "live_iseq_count:       " + format_number(13, stats[:live_iseq_count])
+      out.puts "iseq_alloc_count:      " + format_number(13, stats[:iseq_alloc_count])
       out.puts "compiled_iseq_entry:   " + format_number(13, stats[:compiled_iseq_entry])
       out.puts "cold_iseq_entry:       " + format_number_pct(13, stats[:cold_iseq_entry], stats[:compiled_iseq_entry] + stats[:cold_iseq_entry])
       out.puts "compiled_iseq_count:   " + format_number(13, stats[:compiled_iseq_count])

yjit/src/stats.rs

@@ -15,10 +15,14 @@ use crate::cruby::*;
 use crate::options::*;
 use crate::yjit::yjit_enabled_p;
 
-/// A running total of how many ISeqs are in the system.
+/// Running total of how many ISeqs are in the system.
 #[no_mangle]
 pub static mut rb_yjit_live_iseq_count: u64 = 0;
 
+/// Monotonically increasing total of how many ISEQs were allocated
+#[no_mangle]
+pub static mut rb_yjit_iseq_alloc_count: u64 = 0;
+
 /// A middleware to count Rust-allocated bytes as yjit_alloc_size.
 #[global_allocator]
 static GLOBAL_ALLOCATOR: StatsAlloc = StatsAlloc { alloc_size: AtomicUsize::new(0) };
@@ -748,6 +752,7 @@ fn rb_yjit_gen_stats_dict(context: bool) -> VALUE {
         hash_aset_usize!(hash, "vm_insns_count", rb_vm_insns_count as usize);
 
         hash_aset_usize!(hash, "live_iseq_count", rb_yjit_live_iseq_count as usize);
+        hash_aset_usize!(hash, "iseq_alloc_count", rb_yjit_iseq_alloc_count as usize);
     }
 
     // If we're not generating stats, put only default counters