Add threshold for V8Followup-IdleGC

Add threshold for V8Followup-IdleGC

The V8Followup-IdleGC seems to be triggering a lot of GCs with low collection count.

BUG=None

Committed: https://crrev.com/d2466040fdea5f25406f9c6ac07efab10c46548d
Cr-Commit-Position: refs/heads/master@{#380607}

[keishi, 2016-03-11 08:16:01]

keishi@chromium.org changed reviewers:
+ haraken@chromium.org, oilpan-reviews@chromium.org

[keishi, 2016-03-11 08:16:01]

According to some browsing I did on a costom Chrome build that can count
V8Followup-IdleGCs, it looks like V8Followup-IdleGCs accounts for a big chunk of
the 0% collection rate IdleGCs.

https://drive.google.com/file/d/0BwRi59l_ri74M3NyenUzUVZnd00/view?usp=sharing

I applied this change and the collection rate histogram looks better.

https://drive.google.com/file/d/0BwRi59l_ri74SmpxMExrUzRMeE0/view?usp=sharing

Another problem I noticed(unrelated to this CL) is that the heapGrowingRate has
very little correlation with the actual collectionRate of
IdleGCs(non-V8Followup).

https://drive.google.com/file/d/0BwRi59l_ri74SWNyQm9tMXQxb00/view?usp=sharing

[haraken, 2016-03-11 08:17:09]

LGTM

[sof, 2016-03-11 08:20:00]

sigbjornf@opera.com changed reviewers:
+ sigbjornf@opera.com

[sof, 2016-03-11 08:20:01]

lgtm

[keishi, 2016-03-11 08:26:39]

The CQ bit was checked by keishi@chromium.org

[commit-bot: I haz the power, 2016-03-11 08:27:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1782833005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1782833005/1

[commit-bot: I haz the power, 2016-03-11 10:47:35]

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

[commit-bot: I haz the power, 2016-03-11 10:47:36]

Try jobs failed on following builders:
  win_chromium_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel_...)

[keishi, 2016-03-11 11:09:51]

The CQ bit was checked by keishi@chromium.org

[commit-bot: I haz the power, 2016-03-11 11:10:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1782833005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1782833005/1

[commit-bot: I haz the power, 2016-03-11 12:18:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-03-11 12:20:19]

Description was changed from

==========
Add threshold for V8Followup-IdleGC

The V8Followup-IdleGC seems to be triggering a lot of GCs with low collection
count.

BUG=None
==========

to

==========
Add threshold for V8Followup-IdleGC

The V8Followup-IdleGC seems to be triggering a lot of GCs with low collection
count.

BUG=None

Committed: https://crrev.com/d2466040fdea5f25406f9c6ac07efab10c46548d
Cr-Commit-Position: refs/heads/master@{#380607}
==========

[commit-bot: I haz the power, 2016-03-11 12:20:20]

Patchset 1 (id:??) landed as
https://crrev.com/d2466040fdea5f25406f9c6ac07efab10c46548d
Cr-Commit-Position: refs/heads/master@{#380607}