Reland "[heap] Introduce parallel compaction algorithm."

Reland "[heap] Introduce parallel compaction algorithm."

This reverts commit 7a0a0b8b85e4cdf06795ffea01855b345776b932.

- The number of parallel tasks is still 1, i.e., we only compact on the main
  thread.
- Remove emergency memory (PagedSpace, and CodeRange)
- Introduce partial compaction of pages.
- Logic for multiple tasks is in place.

BUG=chromium:524425
LOG=N

Committed: https://crrev.com/7af79ae67ab48858c4c5f5a2d6df8e41f7658eeb
Cr-Commit-Position: refs/heads/master@{#30796}

[Michael Lippautz, 2015-09-17 08:55:10]

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

[Hannes Payer (out of office), 2015-09-17 09:09:46]

https://codereview.chromium.org/1356533002/diff/20001/src/heap/spaces.cc
File src/heap/spaces.cc (right):

https://codereview.chromium.org/1356533002/diff/20001/src/heap/spaces.cc#newc...
src/heap/spaces.cc:986: void PagedSpace::MoveOverFreeMemory(PagedSpace* other,
bool other_is_local) {
As discussed offline: let's solve this using a three state enum (for different
kinds of local spaces) or based on the space type.

[Michael Lippautz, 2015-09-17 09:27:15]

Working on the api test failure now.

https://codereview.chromium.org/1356533002/diff/20001/src/heap/spaces.cc
File src/heap/spaces.cc (right):

https://codereview.chromium.org/1356533002/diff/20001/src/heap/spaces.cc#newc...
src/heap/spaces.cc:986: void PagedSpace::MoveOverFreeMemory(PagedSpace* other,
bool other_is_local) {
On 2015/09/17 09:09:46, Hannes Payer wrote:
> As discussed offline: let's solve this using a three state enum (for different
> kinds of local spaces) or based on the space type.

Type-based lock it is.

[Michael Lippautz, 2015-09-17 11:10:01]

The CQ bit was checked by mlippautz@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-09-17 11:10:10]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1356533002/80001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1356533002/80001

[Michael Lippautz, 2015-09-17 11:45:06]

The CQ bit was unchecked by mlippautz@chromium.org

[Hannes Payer (out of office), 2015-09-17 11:53:15]

lgtm

[Hannes Payer (out of office), 2015-09-17 11:53:19]

The CQ bit was checked by hpayer@chromium.org

[commit-bot: I haz the power, 2015-09-17 11:53:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1356533002/80001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1356533002/80001

[commit-bot: I haz the power, 2015-09-17 12:23:52]

Committed patchset #5 (id:80001)

[commit-bot: I haz the power, 2015-09-17 12:24:07]

Patchset 5 (id:??) landed as
https://crrev.com/7af79ae67ab48858c4c5f5a2d6df8e41f7658eeb
Cr-Commit-Position: refs/heads/master@{#30796}