[heap] Minor MC: Add evacuation phase

[heap] Minor MC: Add evacuation phase

- Reuse major MC evacuation infrastructure.
- Add another path for refilling from old space when the sweeper is not running,
  effectively reusing more memory and keeping the old->new set more compact.

BUG=chromium:651354

[Michael Lippautz, 2016-11-16 14:09:00]

Description was changed from

==========
[heap] Minor MC: Add evacuation phase

BUG=
==========

to

==========
[heap] Minor MC: Add evacuation phase

BUG=chromium:651354
==========

[Michael Lippautz, 2016-11-17 20:17:37]

Description was changed from

==========
[heap] Minor MC: Add evacuation phase

BUG=chromium:651354
==========

to

==========
[heap] Minor MC: Add evacuation phase

TODO: Refill from old space or concurrent sweeper.

BUG=chromium:651354
==========

[Michael Lippautz, 2016-11-18 11:47:35]

Description was changed from

==========
[heap] Minor MC: Add evacuation phase

TODO: Refill from old space or concurrent sweeper.

BUG=chromium:651354
==========

to

==========
[heap] Minor MC: Add evacuation phase

BUG=chromium:651354
==========

[Michael Lippautz, 2016-11-18 11:47:35]

Description was changed from

==========
[heap] Minor MC: Add evacuation phase

TODO: Refill from old space or concurrent sweeper.

BUG=chromium:651354
==========

to

==========
[heap] Minor MC: Add evacuation phase

BUG=chromium:651354
==========

[Michael Lippautz, 2016-11-18 11:49:47]

Description was changed from

==========
[heap] Minor MC: Add evacuation phase

BUG=chromium:651354
==========

to

==========
[heap] Minor MC: Add evacuation phase

- Reuse major MC evacuation infrastructure.
- Add another path for refilling from old space when the sweeper is not running,
effectively reusing more memory and keeping the old->new set more compact.

BUG=chromium:651354
==========

[Michael Lippautz, 2016-11-18 11:50:00]

Description was changed from

==========
[heap] Minor MC: Add evacuation phase

- Reuse major MC evacuation infrastructure.
- Add another path for refilling from old space when the sweeper is not running,
effectively reusing more memory and keeping the old->new set more compact.

BUG=chromium:651354
==========

to

==========
[heap] Minor MC: Add evacuation phase

- Reuse major MC evacuation infrastructure.
- Add another path for refilling from old space when the sweeper is not running,
  effectively reusing more memory and keeping the old->new set more compact.

BUG=chromium:651354
==========

[Michael Lippautz, 2016-11-18 13:33:35]

mlippautz@chromium.org changed reviewers:
+ hpayer@chromium.org, ulan@chromium.org

[Michael Lippautz, 2016-11-18 13:33:35]

PTAL

This seems to be on par with the scavenger on infinite_scroll_tbmv2. We already
allocate from the free list and parallelize as much as possible. 

Unfortunately we cannot verify moved pages as we don't update pointers in dead
objects.

[Michael Lippautz, 2016-11-18 13:54:20]

Ulan just mentioned that we need to sweep the pages that were moved because the
object iterators depend on the fact that any object retrieved from them (e.g. in
the debugger) can be inspected. Adding the sweeping will also enable the pages
to be verified.

[Michael Lippautz, 2016-11-18 18:03:55]

Brain dump: We could also do lazy sweeping (indicated by a page flag) by keeping
around the liveness info. This way we could even avoid sweeping the pages at the
end of full GCs while being able to verify and iterate those pages.

[Hannes Payer (out of office), 2016-11-23 11:25:37]

https://codereview.chromium.org/2504993002/diff/230001/src/heap/mark-compact.cc
File src/heap/mark-compact.cc (right):

https://codereview.chromium.org/2504993002/diff/230001/src/heap/mark-compact....
src/heap/mark-compact.cc:311:
EvacuateNewSpaceAndCandidates<MarkCompactMode::YOUNG_GENERATION>();
How about restructuring EvacuateNewSpaceAndCandidates such that we can only call
EvacuateNewSpace here?

[Michael Lippautz, 2017-04-07 09:54:06]

Description was changed from

==========
[heap] Minor MC: Add evacuation phase

- Reuse major MC evacuation infrastructure.
- Add another path for refilling from old space when the sweeper is not running,
  effectively reusing more memory and keeping the old->new set more compact.

BUG=chromium:651354
==========

to

==========
[heap] Minor MC: Add evacuation phase

- Reuse major MC evacuation infrastructure.
- Add another path for refilling from old space when the sweeper is not running,
  effectively reusing more memory and keeping the old->new set more compact.

BUG=chromium:651354
==========