🏄 [heap] Add page evacuation mode for new->old

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index b948957a564bf1c34761d830d5d44183027d3cae..f484404e77ab301416ee1b84102e68008960f686 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -253,6 +253,9 @@ DEFINE_BOOL(compiled_keyed_generic_loads, false,
             "use optimizing compiler to generate keyed generic load stubs")
 DEFINE_BOOL(allocation_site_pretenuring, true,
             "pretenure with allocation sites")
+DEFINE_BOOL(page_evacuation, true, "evacuate pages based on utilization")

[Hannes Payer (out of office), 2016/04/18 12:12:23]

The term evacuation is already used in v8. Evacuation candidates are pages that
will be compacted. We are not going to move objects when this mode is on, we are
moving pages instead.

Better name?
-fast_page_evacuation
-page_promotion

WDYT?

[Michael Lippautz, 2016/04/18 12:57:38]

page_promotion it is

+DEFINE_INT(page_evacuation_threshold, 0,
+           "min percentage of live bytes on a page to enable fast evacuation")
 DEFINE_BOOL(trace_pretenuring, false,
             "trace pretenuring decisions of HAllocate instructions")
 DEFINE_BOOL(trace_pretenuring_statistics, false,