Extract function to compute mutator utilization.

Extract function to compute mutator utilization.

This function will be used later instead of HasLowAllocationRate
to decide how many pages to compact.

BUG=chromium:502247
LOG=NO

Committed: https://crrev.com/0752abb11453a3f1ea1d4eecf3f9068b6f599e4d
Cr-Commit-Position: refs/heads/master@{#29841}

[ulan, 2015-07-23 14:53:44]

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

[ulan, 2015-07-23 14:53:45]

Hannes, ptal. This is just refactoring without any change in behavior.

[Hannes Payer (out of office), 2015-07-24 07:44:22]

https://codereview.chromium.org/1254603002/diff/1/src/heap/heap.cc
File src/heap/heap.cc (right):

https://codereview.chromium.org/1254603002/diff/1/src/heap/heap.cc#newcode4824
src/heap/heap.cc:4824: double Heap::MutatorUtilization() {
This function is not called.

[ulan, 2015-07-24 07:47:21]

https://codereview.chromium.org/1254603002/diff/1/src/heap/heap.cc
File src/heap/heap.cc (right):

https://codereview.chromium.org/1254603002/diff/1/src/heap/heap.cc#newcode4824
src/heap/heap.cc:4824: double Heap::MutatorUtilization() {
On 2015/07/24 07:44:22, Hannes Payer wrote:
> This function is not called.

Removed it for now. I will add it back in the next CL with usage.

[Hannes Payer (out of office), 2015-07-24 09:43:19]

lgtm

[ulan, 2015-07-24 09:46:04]

The CQ bit was checked by ulan@chromium.org

[commit-bot: I haz the power, 2015-07-24 09:46:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1254603002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1254603002/20001

[ulan, 2015-07-24 09:46:45]

The CQ bit was unchecked by ulan@chromium.org

[ulan, 2015-07-24 09:52:10]

The CQ bit was checked by ulan@chromium.org

[ulan, 2015-07-24 09:52:11]

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/1254603002/#ps40001
(title: "return min mutator utilization instead of max when there is no data.")

[commit-bot: I haz the power, 2015-07-24 09:52:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1254603002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1254603002/40001

[commit-bot: I haz the power, 2015-07-24 10:31:25]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-07-24 10:31:41]

Patchset 3 (id:??) landed as
https://crrev.com/0752abb11453a3f1ea1d4eecf3f9068b6f599e4d
Cr-Commit-Position: refs/heads/master@{#29841}