Oilpan profiling: Trace GC heuristic parameters.

Oilpan profiling: Trace GC heuristic parameters.

This patch adds tracing of a few metrics used by Oilpan to determine whether
it should schedule a GC.

With a GC tracing-enabled build, you can see how these values change over time
from about:tracing.

BUG=none
R=haraken@chromium.org, keishi@chromium.org, oilpan-reviews@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=197014

[haraken, 2015-06-12 06:06:14]

LGTM

[keishi, 2015-06-12 06:06:56]

LGTM. I will add these to JS.

[keishi, 2015-06-12 06:10:00]

On 2015/06/12 06:06:56, keishi wrote:
> LGTM. I will add these to JS.

I see. I don't need to change the free list visualizer because these get
displayed appropriately in about:tracing.

[Yuta Kitamura, 2015-06-12 06:26:05]

On 2015/06/12 06:10:00, keishi wrote:
> On 2015/06/12 06:06:56, keishi wrote:
> > LGTM. I will add these to JS.
> 
> I see. I don't need to change the free list visualizer because these get
> displayed appropriately in about:tracing.

I want these to be added to your visualizer, because:
- It's hard to compare the absolute values with the about:tracing viewer
  (the graph is tiny and each value has different scales);
- I probably want to compare other values available in your visualizer.

You probably need to figure out how TRACE_COUNTER() transforms into JSON,
but I assume that's not too hard...

[Yuta Kitamura, 2015-06-12 06:26:37]

The CQ bit was checked by yutak@chromium.org

[commit-bot: I haz the power, 2015-06-12 06:27:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1186453002/1

[keishi, 2015-06-12 06:27:33]

On 2015/06/12 06:26:05, Yuta Kitamura wrote:
> On 2015/06/12 06:10:00, keishi wrote:
> > On 2015/06/12 06:06:56, keishi wrote:
> > > LGTM. I will add these to JS.
> > 
> > I see. I don't need to change the free list visualizer because these get
> > displayed appropriately in about:tracing.
> 
> I want these to be added to your visualizer, because:
> - It's hard to compare the absolute values with the about:tracing viewer
>   (the graph is tiny and each value has different scales);
> - I probably want to compare other values available in your visualizer.
> 
> You probably need to figure out how TRACE_COUNTER() transforms into JSON,
> but I assume that's not too hard...

No problem. Do you have a sample JSON file I could use to test?

[Yuta Kitamura, 2015-06-12 06:29:39]

On 2015/06/12 06:27:33, keishi wrote:
> No problem. Do you have a sample JSON file I could use to test?

Just a moment, I'll try with my local build.

[Yuta Kitamura, 2015-06-12 06:33:12]

On 2015/06/12 06:29:39, Yuta Kitamura wrote:
> On 2015/06/12 06:27:33, keishi wrote:
> > No problem. Do you have a sample JSON file I could use to test?
> 
> Just a moment, I'll try with my local build.

Here it is:
https://www.googledrive.com/host/0B6XhrzUCq5lhUjloNWR3b0xxRXM/2015/trace_gc-m...

[keishi, 2015-06-12 07:06:17]

On 2015/06/12 06:33:12, Yuta Kitamura wrote:
> On 2015/06/12 06:29:39, Yuta Kitamura wrote:
> > On 2015/06/12 06:27:33, keishi wrote:
> > > No problem. Do you have a sample JSON file I could use to test?
> > 
> > Just a moment, I'll try with my local build.
> 
> Here it is:
>
https://www.googledrive.com/host/0B6XhrzUCq5lhUjloNWR3b0xxRXM/2015/trace_gc-m...

Thanks. I think I'm finished. The chart looks different from about::tracing
because I connect the plotted samples with lines, but about::tracing draws a
flat line between samples (step chart).

It is available at the old url:
https://fc22316f052326f6d9de9a282a6039e811d12e8d-www.googledrive.com/host/0B4...

[commit-bot: I haz the power, 2015-06-12 07:48:01]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=197014