[ruby-cvs:57136] ko1:r49987 (trunk): * include/ruby/ruby.h: use rb_gc_writebrrier() simply.

ko1 at ruby-lang.org ko1 at ruby-lang.org
Tue Mar 17 19:26:41 JST 2015

ko1	2015-03-17 19:26:39 +0900 (Tue, 17 Mar 2015)

  New Revision: 49987


    * include/ruby/ruby.h: use rb_gc_writebrrier() simply.
      For incremental GC, we need to get a pointer to the objspace.
      We can share this pointer for the following WB process.
      And considering icache hit ratio, prcess in the GC.
    * gc.c (rb_gc_writebarrier): added.
    * gc.c (gc_writebarrier_generational, gc_writebarrier_incremental):
      make them NOINLINE because inlining them into rb_gc_writebarrier()
      makes a prologue code of rb_gc_writebarrier() longer (storing callee
      save registers).
      This patch improve the performance of WB on micro-benchmarks.
      name                   ruby 2.1   trunk   modified
      vm1_gc_wb_ary*            0.511   0.632      0.532
      vm1_gc_wb_ary_promoted*   0.578   0.701      0.674
      vm1_gc_wb_obj*            0.419   0.575      0.492
      vm1_gc_wb_obj_promoted*   0.537   0.664      0.618

  Modified files:

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