Never uncommit the whole marking deque in case we can't get it back

Never uncommit the whole marking deque in case we can't get it back

R=hpayer@chromium.org
BUG=

Committed: https://crrev.com/98f45a409cb697cc0de65b937f08d96997520378
Cr-Commit-Position: refs/heads/master@{#28822}

[Erik Corry, 2015-05-11 19:49:13]

erik.corry@gmail.com changed reviewers:
+ erik.corry@gmail.com

[Erik Corry, 2015-05-11 19:49:13]

Previous version at https://codereview.chromium.org/1134743002/ would:

* Reserve and commit 256k at start.
* Try to increase reservation and commit to up to 4MBytes when GCing.
* Uncommit and unreserve everything after GC <-- this was dumb

New tactic.

* Reserve 4Mbytes from start and never change this to combat virtual
fragmentation
* Reduce commitment to 256k between GCs and try to increase to 4Mbytes or as
much as possible during GC

[Hannes Payer (out of office), 2015-05-12 12:34:14]

lgtm

[Erik Corry, 2015-05-12 15:47:05]

The CQ bit was checked by erik.corry@gmail.com

[commit-bot: I haz the power, 2015-05-12 15:47:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1133153003/1

[commit-bot: I haz the power, 2015-05-12 16:00:09]

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

[commit-bot: I haz the power, 2015-05-12 16:00:10]

Try jobs failed on following builders:
  v8_linux64_avx2_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_avx2_rel/builds/325)

[Erik Corry, 2015-05-13 16:59:25]

The CQ bit was checked by erik.corry@gmail.com to run a CQ dry run

[Erik Corry, 2015-05-13 16:59:25]

The patchset sent to the CQ was uploaded after l-g-t-m from hpayer@chromium.org
Link to the patchset: https://codereview.chromium.org/1133153003/#ps20001
(title: "Don't accidentally wipe out the marking deque's overflow flag by
reinitializing it")

[commit-bot: I haz the power, 2015-05-13 16:59:34]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1133153003/20001

[commit-bot: I haz the power, 2015-05-13 17:12:40]

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

[commit-bot: I haz the power, 2015-05-13 17:12:41]

Dry run: Try jobs failed on following builders:
  v8_linux64_avx2_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_avx2_rel/builds/365)

[Erik Corry, 2015-05-13 17:23:10]

The CQ bit was checked by erik.corry@gmail.com to run a CQ dry run

[Erik Corry, 2015-05-13 17:23:10]

The patchset sent to the CQ was uploaded after l-g-t-m from hpayer@chromium.org
Link to the patchset: https://codereview.chromium.org/1133153003/#ps40001
(title: "Remove failing assert.")

[commit-bot: I haz the power, 2015-05-13 17:23:25]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1133153003/40001

[commit-bot: I haz the power, 2015-05-13 17:37:18]

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

[commit-bot: I haz the power, 2015-05-13 17:37:19]

Dry run: Try jobs failed on following builders:
  v8_linux64_avx2_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_avx2_rel/builds/367)

[Erik Corry Chromium.org, 2015-05-22 16:11:13]

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

[Erik Corry Chromium.org, 2015-05-22 16:11:14]

The patchset sent to the CQ was uploaded after l-g-t-m from hpayer@chromium.org
Link to the patchset: https://codereview.chromium.org/1133153003/#ps80001
(title: "Fix that we were releasing the marking deque wrong when a new GC starts
immediately")

[commit-bot: I haz the power, 2015-05-22 16:11:32]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1133153003/80001

[commit-bot: I haz the power, 2015-05-22 16:28:23]

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

[commit-bot: I haz the power, 2015-05-22 16:28:24]

Dry run: Try jobs failed on following builders:
  v8_linux64_avx2_rel on tryserver.v8 (JOB_FAILED,
http://build.chromium.org/p/tryserver.v8/builders/v8_linux64_avx2_rel/builds/692)

[Erik Corry Chromium.org, 2015-06-08 07:32:27]

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

[Erik Corry Chromium.org, 2015-06-08 07:32:27]

The patchset sent to the CQ was uploaded after l-g-t-m from hpayer@chromium.org
Link to the patchset: https://codereview.chromium.org/1133153003/#ps100001
(title: "Merge")

[commit-bot: I haz the power, 2015-06-08 07:32:44]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1133153003/100001

[commit-bot: I haz the power, 2015-06-08 08:09:23]

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

[commit-bot: I haz the power, 2015-06-08 08:09:24]

Dry run: This issue passed the CQ dry run.

[Erik Corry Chromium.org, 2015-06-08 08:38:15]

The CQ bit was checked by erikcorry@chromium.org

[commit-bot: I haz the power, 2015-06-08 08:38:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1133153003/100001

[commit-bot: I haz the power, 2015-06-08 08:47:41]

Committed patchset #6 (id:100001)

[commit-bot: I haz the power, 2015-06-08 08:47:58]

Patchset 6 (id:??) landed as
https://crrev.com/98f45a409cb697cc0de65b937f08d96997520378
Cr-Commit-Position: refs/heads/master@{#28822}