Reland "[heap] Add page evacuation mode for new->new"

Reland "[heap] Add page evacuation mode for new->new"

Adds an evacuation mode that allows moving pages within new space without
copying objects.

Basic idea:
a) Move page within new space
b) Sweep page to make iterable and process ArrayBuffers
c) Finish sweep till next scavenge

Threshold is currently 70% live bytes, i.e., the same threshold we use
to determine fragmented pages.

This reverts commit 2263ee9bf4e5aa341cbac547add68a2105963477.

BUG=chromium:581412
LOG=N
CQ_EXTRA_TRYBOTS=tryserver.v8:v8_linux_arm64_gc_stress_dbg,v8_linux_gc_stress_dbg,v8_mac_gc_stress_dbg,v8_linux64_tsan_rel,v8_mac64_asan_rel

Committed: https://crrev.com/7d5969da3d2b1a9b08c6fc6517d69f8ca4aca94c
Cr-Commit-Position: refs/heads/master@{#37104}

[Michael Lippautz, 2016-06-17 08:04:09]

Description was changed from

==========
Reland "[heap] Add page evacuation mode for new->new"

This reverts commit 2263ee9bf4e5aa341cbac547add68a2105963477.

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

to

==========
Reland "[heap] Add page evacuation mode for new->new"

Adds an evacuation mode that allows moving pages within new space without
copying objects.

Basic idea:
a) Move page within new space
b) Sweep page to make iterable and process ArrayBuffers
c) Finish sweep till next scavenge

Threshold is currently 70% live bytes, i.e., the same threshold we use
to determine fragmented pages.

This reverts commit 2263ee9bf4e5aa341cbac547add68a2105963477.

BUG=chromium:581412
LOG=N
CQ_EXTRA_TRYBOTS=tryserver.v8:v8_linux_arm64_gc_stress_dbg,v8_linux_gc_stress_dbg,v8_mac_gc_stress_dbg,v8_linux64_tsan_rel,v8_mac64_asan_rel
==========

[Michael Lippautz, 2016-06-17 08:05:15]

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

[commit-bot: I haz the power, 2016-06-17 08:05:16]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2078863002/20001

[Michael Lippautz, 2016-06-17 08:05:29]

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

[commit-bot: I haz the power, 2016-06-17 08:36:54]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-06-17 08:36:54]

Dry run: Try jobs failed on following builders:
  v8_win64_rel_ng on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_win64_rel_ng/builds/9003)
  v8_win64_rel_ng_triggered on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_win64_rel_ng_triggered/b...)

[Michael Lippautz, 2016-06-17 08:55:01]

ptal, PS1->PS2 solves the fragmentation issue.

[ulan, 2016-06-17 13:59:48]

lgtm

https://codereview.chromium.org/2078863002/diff/20001/src/heap/spaces.h
File src/heap/spaces.h (right):

https://codereview.chromium.org/2078863002/diff/20001/src/heap/spaces.h#newco...
src/heap/spaces.h:2462: if (next_page == anchor() || (pages_used_ ==
max_pages())) {
nit: no need for braces in (pages_used_ == max_pages())

[Michael Lippautz, 2016-06-17 14:30:00]

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

[commit-bot: I haz the power, 2016-06-17 14:30:08]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2078863002/60001

[Michael Lippautz, 2016-06-17 14:32:03]

Also added the test to test/cctest/BUILD.gn

https://codereview.chromium.org/2078863002/diff/20001/src/heap/spaces.h
File src/heap/spaces.h (right):

https://codereview.chromium.org/2078863002/diff/20001/src/heap/spaces.h#newco...
src/heap/spaces.h:2462: if (next_page == anchor() || (pages_used_ ==
max_pages())) {
On 2016/06/17 13:59:48, ulan wrote:
> nit: no need for braces in (pages_used_ == max_pages())

Done.

[commit-bot: I haz the power, 2016-06-17 15:09:56]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-06-17 15:09:57]

Dry run: This issue passed the CQ dry run.

[Michael Lippautz, 2016-06-20 12:37:46]

The CQ bit was checked by mlippautz@chromium.org

[Michael Lippautz, 2016-06-20 12:37:47]

The patchset sent to the CQ was uploaded after l-g-t-m from ulan@chromium.org
Link to the patchset: https://codereview.chromium.org/2078863002/#ps60001
(title: "Add test to test/cctest/BUILD.gn")

[commit-bot: I haz the power, 2016-06-20 12:37:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2078863002/60001

[commit-bot: I haz the power, 2016-06-20 13:19:41]

Description was changed from

==========
Reland "[heap] Add page evacuation mode for new->new"

Adds an evacuation mode that allows moving pages within new space without
copying objects.

Basic idea:
a) Move page within new space
b) Sweep page to make iterable and process ArrayBuffers
c) Finish sweep till next scavenge

Threshold is currently 70% live bytes, i.e., the same threshold we use
to determine fragmented pages.

This reverts commit 2263ee9bf4e5aa341cbac547add68a2105963477.

BUG=chromium:581412
LOG=N
CQ_EXTRA_TRYBOTS=tryserver.v8:v8_linux_arm64_gc_stress_dbg,v8_linux_gc_stress_dbg,v8_mac_gc_stress_dbg,v8_linux64_tsan_rel,v8_mac64_asan_rel
==========

to

==========
Reland "[heap] Add page evacuation mode for new->new"

Adds an evacuation mode that allows moving pages within new space without
copying objects.

Basic idea:
a) Move page within new space
b) Sweep page to make iterable and process ArrayBuffers
c) Finish sweep till next scavenge

Threshold is currently 70% live bytes, i.e., the same threshold we use
to determine fragmented pages.

This reverts commit 2263ee9bf4e5aa341cbac547add68a2105963477.

BUG=chromium:581412
LOG=N
CQ_EXTRA_TRYBOTS=tryserver.v8:v8_linux_arm64_gc_stress_dbg,v8_linux_gc_stress_dbg,v8_mac_gc_stress_dbg,v8_linux64_tsan_rel,v8_mac64_asan_rel
==========

[commit-bot: I haz the power, 2016-06-20 13:19:43]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2016-06-20 13:24:23]

Description was changed from

==========
Reland "[heap] Add page evacuation mode for new->new"

Adds an evacuation mode that allows moving pages within new space without
copying objects.

Basic idea:
a) Move page within new space
b) Sweep page to make iterable and process ArrayBuffers
c) Finish sweep till next scavenge

Threshold is currently 70% live bytes, i.e., the same threshold we use
to determine fragmented pages.

This reverts commit 2263ee9bf4e5aa341cbac547add68a2105963477.

BUG=chromium:581412
LOG=N
CQ_EXTRA_TRYBOTS=tryserver.v8:v8_linux_arm64_gc_stress_dbg,v8_linux_gc_stress_dbg,v8_mac_gc_stress_dbg,v8_linux64_tsan_rel,v8_mac64_asan_rel
==========

to

==========
Reland "[heap] Add page evacuation mode for new->new"

Adds an evacuation mode that allows moving pages within new space without
copying objects.

Basic idea:
a) Move page within new space
b) Sweep page to make iterable and process ArrayBuffers
c) Finish sweep till next scavenge

Threshold is currently 70% live bytes, i.e., the same threshold we use
to determine fragmented pages.

This reverts commit 2263ee9bf4e5aa341cbac547add68a2105963477.

BUG=chromium:581412
LOG=N
CQ_EXTRA_TRYBOTS=tryserver.v8:v8_linux_arm64_gc_stress_dbg,v8_linux_gc_stress_dbg,v8_mac_gc_stress_dbg,v8_linux64_tsan_rel,v8_mac64_asan_rel

Committed: https://crrev.com/7d5969da3d2b1a9b08c6fc6517d69f8ca4aca94c
Cr-Commit-Position: refs/heads/master@{#37104}
==========

[commit-bot: I haz the power, 2016-06-20 13:24:24]

Patchset 4 (id:??) landed as
https://crrev.com/7d5969da3d2b1a9b08c6fc6517d69f8ca4aca94c
Cr-Commit-Position: refs/heads/master@{#37104}