[heap] Explicitly clear mark bits when writing filler for left and right trimming.

[heap] Explicitly clear mark bits when writing filler for left and right trimming.

Since left and right trimming may install a lot of one pointer filler maps, it may still make sense to clear the freed-up black area to speed up sweeping.

BUG=

Review-Url: https://codereview.chromium.org/2578233003
Cr-Commit-Position: refs/heads/master@{#41811}
Committed: https://chromium.googlesource.com/v8/v8/+/1c763e004cae568eebb9d2eb5888f013292e8c76

[Hannes Payer (out of office), 2016-12-15 21:24:27]

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

[commit-bot: I haz the power, 2016-12-15 21:24:36]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-12-15 21:44:05]

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

[commit-bot: I haz the power, 2016-12-15 21:44:05]

Dry run: Try jobs failed on following builders:
  v8_linux64_gyp_rel_ng on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_gyp_rel_ng/build...)
  v8_linux64_gyp_rel_ng_triggered on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_gyp_rel_ng_trigg...)

[Hannes Payer (out of office), 2016-12-19 15:25:06]

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

[commit-bot: I haz the power, 2016-12-19 15:25:14]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Hannes Payer (out of office), 2016-12-19 15:34:26]

Description was changed from

==========
[heap] black allocation

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

to

==========
[heap] Explicitly clear mark bits when writing filler for left and right
trimming.

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

[Hannes Payer (out of office), 2016-12-19 15:34:26]

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

[Hannes Payer (out of office), 2016-12-19 15:34:46]

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

[commit-bot: I haz the power, 2016-12-19 15:34:48]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[Hannes Payer (out of office), 2016-12-19 15:35:41]

Description was changed from

==========
[heap] Explicitly clear mark bits when writing filler for left and right
trimming.

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

to

==========
[heap] Explicitly clear mark bits when writing filler for left and right
trimming.

Since left and right trimming may install a lot of one pointer filler maps, it
may still make sense to clear the freed-up black area to speed up sweeping.

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

[Hannes Payer (out of office), 2016-12-19 15:52:52]

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

[Michael Lippautz, 2016-12-19 16:01:10]

lgtm

[commit-bot: I haz the power, 2016-12-19 16:04:02]

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

[commit-bot: I haz the power, 2016-12-19 16:04:03]

Dry run: This issue passed the CQ dry run.

[ulan, 2016-12-19 16:04:43]

lgtm

[Hannes Payer (out of office), 2016-12-19 16:04:58]

The CQ bit was checked by hpayer@chromium.org

[commit-bot: I haz the power, 2016-12-19 16:05:02]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-12-19 16:06:59]

CQ is committing da patch.

Bot data: {"patchset_id": 40001, "attempt_start_ts": 1482163498561960,
"parent_rev": "0d4b99049797b1e2e465faf89123b34c8cb5cc40", "commit_rev":
"1c763e004cae568eebb9d2eb5888f013292e8c76"}

[commit-bot: I haz the power, 2016-12-19 16:07:05]

Description was changed from

==========
[heap] Explicitly clear mark bits when writing filler for left and right
trimming.

Since left and right trimming may install a lot of one pointer filler maps, it
may still make sense to clear the freed-up black area to speed up sweeping.

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

to

==========
[heap] Explicitly clear mark bits when writing filler for left and right
trimming.

Since left and right trimming may install a lot of one pointer filler maps, it
may still make sense to clear the freed-up black area to speed up sweeping.

BUG=

Review-Url: https://codereview.chromium.org/2578233003
Cr-Commit-Position: refs/heads/master@{#41811}
Committed:
https://chromium.googlesource.com/v8/v8/+/1c763e004cae568eebb9d2eb5888f013292...
==========

[commit-bot: I haz the power, 2016-12-19 16:07:06]

Committed patchset #3 (id:40001) as
https://chromium.googlesource.com/v8/v8/+/1c763e004cae568eebb9d2eb5888f013292...