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ruby_gc_set_params: update malloc_limit when env is set 

During VM startup, rb_objspace_alloc sets malloc_limit
(objspace->malloc_params.limit) before ruby_gc_set_params is called, thus
nullifying the effect of RUBY_GC_MALLOC_LIMIT before the initial GC run.

The call sequence is as follows:

  main.c::main()
    ruby_init
      ruby_setup
        Init_BareVM
          rb_objspace_alloc // malloc_limit = gc_params.malloc_limit_min;
    ruby_options
      ruby_process_options
        process_options
          ruby_gc_set_params // RUBY_GC_MALLOC_LIMIT => gc_params.malloc_limit_min

With ruby_gc_set_params setting malloc_limit, RUBY_GC_MALLOC_LIMIT
affects the process sooner.

[ruby-core:107170]
This commit is contained in:
Eric Wong 2022-01-17 20:36:49 +00:00 committed by Eric Wong
parent 4a4485adbd
commit a19b2d59fc
1 changed files with 4 additions and 2 deletions
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6
gc.c
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@ -11267,6 +11267,7 @@ gc_set_initial_pages(void)
void
ruby_gc_set_params(void)
{
rb_objspace_t *objspace = &rb_objspace;
/* RUBY_GC_HEAP_FREE_SLOTS */
if (get_envparam_size("RUBY_GC_HEAP_FREE_SLOTS", &gc_params.heap_free_slots, 0)) {
/* ok */
@ -11287,7 +11288,9 @@ ruby_gc_set_params(void)
gc_params.heap_free_slots_min_ratio, gc_params.heap_free_slots_max_ratio, TRUE);
get_envparam_double("RUBY_GC_HEAP_OLDOBJECT_LIMIT_FACTOR", &gc_params.oldobject_limit_factor, 0.0, 0.0, TRUE);
get_envparam_size ("RUBY_GC_MALLOC_LIMIT", &gc_params.malloc_limit_min, 0);
if (get_envparam_size("RUBY_GC_MALLOC_LIMIT", &gc_params.malloc_limit_min, 0)) {
malloc_limit = gc_params.malloc_limit_min;
}
get_envparam_size ("RUBY_GC_MALLOC_LIMIT_MAX", &gc_params.malloc_limit_max, 0);
if (!gc_params.malloc_limit_max) { /* ignore max-check if 0 */
gc_params.malloc_limit_max = SIZE_MAX;
@ -11296,7 +11299,6 @@ ruby_gc_set_params(void)
#if RGENGC_ESTIMATE_OLDMALLOC
if (get_envparam_size("RUBY_GC_OLDMALLOC_LIMIT", &gc_params.oldmalloc_limit_min, 0)) {
rb_objspace_t *objspace = &rb_objspace;
objspace->rgengc.oldmalloc_increase_limit = gc_params.oldmalloc_limit_min;
}
get_envparam_size ("RUBY_GC_OLDMALLOC_LIMIT_MAX", &gc_params.oldmalloc_limit_max, 0);