34 lines
1011 B
Diff
34 lines
1011 B
Diff
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diff --git a/configure.ac b/configure.ac
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index d251da9915..5e2a67db1b 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -1825,6 +1825,7 @@ AC_CHECK_FUNCS(lstat)
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AC_CHECK_FUNCS(lutimes)
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AC_CHECK_FUNCS(malloc_usable_size)
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AC_CHECK_FUNCS(malloc_size)
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+AC_CHECK_FUNCS(malloc_trim)
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AC_CHECK_FUNCS(mblen)
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AC_CHECK_FUNCS(memalign)
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AC_CHECK_FUNCS(memset_s)
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diff --git a/gc.c b/gc.c
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index 1331ef21dc..12caa162e7 100644
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--- a/gc.c
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+++ b/gc.c
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@@ -6660,7 +6660,15 @@ gc_start(rb_objspace_t *objspace, int reason)
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gc_prof_timer_start(objspace);
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{
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- gc_marks(objspace, do_full_mark);
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+ gc_marks(objspace, do_full_mark);
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+#ifdef HAVE_MALLOC_TRIM
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+ /* [Experimental] Explicitly free all eligible pages to the kernel. See:
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+ *
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+ * - https://www.joyfulbikeshedding.com/blog/2019-03-14-what-causes-ruby-memory-bloat.html
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+ * - https://bugs.ruby-lang.org/issues/15667
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+ */
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+ if (do_full_mark) malloc_trim(0);
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+#endif
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}
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gc_prof_timer_stop(objspace);
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