Reduce ephemeron stack size reservation.

Reduce ephemeron stack size reservation.

The ephemeron stack is used by the Oilpan GC to handle key-value pairs
over weak references as wanted (i.e., the value is strongly referenced
until the key becomes unreachable). The marking process will push
hash tables containing such onto a stack processing for later processing.

Blink only has a handful of hash tables requiring ephemeron processing,
hence tune down the initial size of the stack accordingly.

As a data point, browsing around on various popular sites resulted in
ephemeron stacks no deeper than in the mid-20s.

R=haraken
BUG=

Committed: https://crrev.com/ac2a059d4486172d24bdcf5b82be6f5300d5102d
Cr-Commit-Position: refs/heads/master@{#378131}

[sof, 2016-02-26 16:48:30]

Description was changed from

==========
Reduce ephemeron stack size reservation.

The ephemeron stack is used by the Oilpan GC to handle key-value pairs
over weak references as wanted (i.e., the value is strongly referenced
until the key becomes unreachable). The marking process will push
hash tables containing such onto a stack processing for later processing.

Blink only has a handful of hash tables requiring ephemeron processing,
hence tune down the initial size of the stack accordingly.

As a data point, browsing around on various popular sites resulted in
ephemeron stacks on deeper than in the mid-20s.

R=
BUG=
==========

to

==========
Reduce ephemeron stack size reservation.

The ephemeron stack is used by the Oilpan GC to handle key-value pairs
over weak references as wanted (i.e., the value is strongly referenced
until the key becomes unreachable). The marking process will push
hash tables containing such onto a stack processing for later processing.

Blink only has a handful of hash tables requiring ephemeron processing,
hence tune down the initial size of the stack accordingly.

As a data point, browsing around on various popular sites resulted in
ephemeron stacks no deeper than in the mid-20s.

R=
BUG=
==========

[sof, 2016-02-26 18:39:20]

sigbjornf@opera.com changed reviewers:
+ oilpan-reviews@chromium.org

[sof, 2016-02-26 18:39:20]

please take a look.

one page blocks for this stack should be more than enough with current Blink use
of weak hash tables. i.e., a saving of 60k (32-bit) or 124k.

[haraken, 2016-02-27 03:17:27]

LGTM

[sof, 2016-02-27 06:02:08]

Description was changed from

==========
Reduce ephemeron stack size reservation.

The ephemeron stack is used by the Oilpan GC to handle key-value pairs
over weak references as wanted (i.e., the value is strongly referenced
until the key becomes unreachable). The marking process will push
hash tables containing such onto a stack processing for later processing.

Blink only has a handful of hash tables requiring ephemeron processing,
hence tune down the initial size of the stack accordingly.

As a data point, browsing around on various popular sites resulted in
ephemeron stacks no deeper than in the mid-20s.

R=
BUG=
==========

to

==========
Reduce ephemeron stack size reservation.

The ephemeron stack is used by the Oilpan GC to handle key-value pairs
over weak references as wanted (i.e., the value is strongly referenced
until the key becomes unreachable). The marking process will push
hash tables containing such onto a stack processing for later processing.

Blink only has a handful of hash tables requiring ephemeron processing,
hence tune down the initial size of the stack accordingly.

As a data point, browsing around on various popular sites resulted in
ephemeron stacks no deeper than in the mid-20s.

R=haraken
BUG=
==========

[sof, 2016-02-27 06:02:13]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2016-02-27 06:02:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1741833002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1741833002/40001

[commit-bot: I haz the power, 2016-02-27 06:14:45]

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

[commit-bot: I haz the power, 2016-02-27 06:14:46]

Try jobs failed on following builders:
  android_clang_dbg_recipe on tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/android_clan...)
  linux_chromium_chromeos_ozone_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[sof, 2016-02-27 07:50:32]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2016-02-27 07:50:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1741833002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1741833002/40001

[commit-bot: I haz the power, 2016-02-27 08:57:14]

Description was changed from

==========
Reduce ephemeron stack size reservation.

The ephemeron stack is used by the Oilpan GC to handle key-value pairs
over weak references as wanted (i.e., the value is strongly referenced
until the key becomes unreachable). The marking process will push
hash tables containing such onto a stack processing for later processing.

Blink only has a handful of hash tables requiring ephemeron processing,
hence tune down the initial size of the stack accordingly.

As a data point, browsing around on various popular sites resulted in
ephemeron stacks no deeper than in the mid-20s.

R=haraken
BUG=
==========

to

==========
Reduce ephemeron stack size reservation.

The ephemeron stack is used by the Oilpan GC to handle key-value pairs
over weak references as wanted (i.e., the value is strongly referenced
until the key becomes unreachable). The marking process will push
hash tables containing such onto a stack processing for later processing.

Blink only has a handful of hash tables requiring ephemeron processing,
hence tune down the initial size of the stack accordingly.

As a data point, browsing around on various popular sites resulted in
ephemeron stacks no deeper than in the mid-20s.

R=haraken
BUG=
==========

[commit-bot: I haz the power, 2016-02-27 08:57:15]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2016-02-27 08:58:41]

Description was changed from

==========
Reduce ephemeron stack size reservation.

The ephemeron stack is used by the Oilpan GC to handle key-value pairs
over weak references as wanted (i.e., the value is strongly referenced
until the key becomes unreachable). The marking process will push
hash tables containing such onto a stack processing for later processing.

Blink only has a handful of hash tables requiring ephemeron processing,
hence tune down the initial size of the stack accordingly.

As a data point, browsing around on various popular sites resulted in
ephemeron stacks no deeper than in the mid-20s.

R=haraken
BUG=
==========

to

==========
Reduce ephemeron stack size reservation.

The ephemeron stack is used by the Oilpan GC to handle key-value pairs
over weak references as wanted (i.e., the value is strongly referenced
until the key becomes unreachable). The marking process will push
hash tables containing such onto a stack processing for later processing.

Blink only has a handful of hash tables requiring ephemeron processing,
hence tune down the initial size of the stack accordingly.

As a data point, browsing around on various popular sites resulted in
ephemeron stacks no deeper than in the mid-20s.

R=haraken
BUG=

Committed: https://crrev.com/ac2a059d4486172d24bdcf5b82be6f5300d5102d
Cr-Commit-Position: refs/heads/master@{#378131}
==========

[commit-bot: I haz the power, 2016-02-27 08:58:42]

Patchset 3 (id:??) landed as
https://crrev.com/ac2a059d4486172d24bdcf5b82be6f5300d5102d
Cr-Commit-Position: refs/heads/master@{#378131}