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[heap] Promote young objects by default in MC

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Start experiment to promote all young live objects during mark-compact.

The last CL https://crrev.com/c/1879938 got reverted because of a flaky
test, see v8:9192.

Change-Id: I16897f45fffeafbb7e70c21899976a4c026e69ba
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1903432
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64832}
This commit is contained in:
Dominik Inführ 2019-11-07 10:51:53 +01:00 committed by Commit Bot
parent 276b13cb00
commit 5e97378f92
1 changed files with 1 additions and 1 deletions
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2
src/flags/flag-definitions.h
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@ -356,7 +356,7 @@ DEFINE_BOOL(assert_types, false,
DEFINE_BOOL(allocation_site_pretenuring, true,
"pretenure with allocation sites")
DEFINE_BOOL(page_promotion, true, "promote pages based on utilization")
DEFINE_BOOL(always_promote_young_mc, false,
DEFINE_BOOL(always_promote_young_mc, true,
"always promote young objects during mark-compact")
DEFINE_INT(page_promotion_threshold, 70,
"min percentage of live bytes on a page to enable fast evacuation")