Process.warmup: invoke `malloc_trim` if available

Similar to releasing free GC pages, releasing free malloc pages
reduce the amount of page faults post fork.

1 files changed, 4 insertions, 0 deletions

diff --git a/gc.c b/gc.c
index 3fd2a3b33f..662ddc3e0f 100644
--- a/gc.c
+++ b/gc.c
@@ -9740,6 +9740,10 @@ rb_gc_prepare_heap(void)
     rb_objspace_each_objects(gc_set_candidate_object_i, NULL);
     gc_start_internal(NULL, Qtrue, Qtrue, Qtrue, Qtrue, Qtrue);
     free_empty_pages();
+
+#if defined(HAVE_MALLOC_TRIM) && !defined(RUBY_ALTERNATIVE_MALLOC_HEADER)
+    malloc_trim(0);
+#endif
 }
 
 static int