ValueDeserializer: Pretenure objects while deserializing large objects.

ValueDeserializer: Pretenure objects while deserializing large objects.

json-parser does the same thing. This drastically reduces GC cost when
deserializing objects large enough that multiple collections are likely
(since it saves the effort to move them to the old generation, when we
know that the objects we create will persist at least until the deserializer
finishes).

The threshold was chosen to match json-parser.

This patch reduces deserialization time on a large blob of JSON-y data
by approximately 30%.

BUG=chromium:148757
Committed: https://crrev.com/66dbc77eaf6b7fdb15b395401d556d3af51758e4
Cr-Commit-Position: refs/heads/master@{#39396}

[jbroman, 2016-09-13 23:31:07]

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

[commit-bot: I haz the power, 2016-09-13 23:31:10]

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

[jbroman, 2016-09-13 23:31:59]

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

[commit-bot: I haz the power, 2016-09-13 23:32:10]

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

[jbroman, 2016-09-13 23:36:42]

Description was changed from

==========
ValueDeserializer: Pretenure objects while deserializing large objects.

json-parser does the same thing. This drastically reduces GC cost when
deserializing objects large enough that multiple collections are likely
(since it saves the effort to move them to the old generation, when we
know that the objects we create will persist at least until the deserializer
finishes).

The threshold was chosen to match json-parser.

BUG=chromium:148757
==========

to

==========
ValueDeserializer: Pretenure objects while deserializing large objects.

json-parser does the same thing. This drastically reduces GC cost when
deserializing objects large enough that multiple collections are likely
(since it saves the effort to move them to the old generation, when we
know that the objects we create will persist at least until the deserializer
finishes).

The threshold was chosen to match json-parser.

This patch reduces deserialization time on a large blob of JSON-y data
by approximately 30%.

BUG=chromium:148757
==========

[jbroman, 2016-09-13 23:36:53]

jbroman@chromium.org changed reviewers:
+ cbruni@chromium.org, jkummerow@chromium.org

[commit-bot: I haz the power, 2016-09-14 00:21:50]

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

[commit-bot: I haz the power, 2016-09-14 00:21:52]

Dry run: Try jobs failed on following builders:
  v8_linux_rel_ng on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_rel_ng/builds/12626)
  v8_linux_rel_ng_triggered on master.tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux_rel_ng_triggered/b...)

[Jakob Kummerow, 2016-09-14 01:29:47]

lgtm

[jbroman, 2016-09-14 02:12:50]

The CQ bit was checked by jbroman@chromium.org

[commit-bot: I haz the power, 2016-09-14 02:12:57]

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, 2016-09-14 02:35:05]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-09-14 02:35:57]

Description was changed from

==========
ValueDeserializer: Pretenure objects while deserializing large objects.

json-parser does the same thing. This drastically reduces GC cost when
deserializing objects large enough that multiple collections are likely
(since it saves the effort to move them to the old generation, when we
know that the objects we create will persist at least until the deserializer
finishes).

The threshold was chosen to match json-parser.

This patch reduces deserialization time on a large blob of JSON-y data
by approximately 30%.

BUG=chromium:148757
==========

to

==========
ValueDeserializer: Pretenure objects while deserializing large objects.

json-parser does the same thing. This drastically reduces GC cost when
deserializing objects large enough that multiple collections are likely
(since it saves the effort to move them to the old generation, when we
know that the objects we create will persist at least until the deserializer
finishes).

The threshold was chosen to match json-parser.

This patch reduces deserialization time on a large blob of JSON-y data
by approximately 30%.

BUG=chromium:148757

Committed: https://crrev.com/66dbc77eaf6b7fdb15b395401d556d3af51758e4
Cr-Commit-Position: refs/heads/master@{#39396}
==========

[commit-bot: I haz the power, 2016-09-14 02:35:58]

Patchset 2 (id:??) landed as
https://crrev.com/66dbc77eaf6b7fdb15b395401d556d3af51758e4
Cr-Commit-Position: refs/heads/master@{#39396}