Track how much we miss the idle notification limit

Track how much we miss the idle notification limit

We can't report negative values using histograms, so we split the data
up into two histograms

BUG=chromium:397026
LOG=n
R=hpayer@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=23981

[Hannes Payer (out of office), 2014-09-16 14:29:34]

LGTM, two nits

https://codereview.chromium.org/572293002/diff/20001/src/counters.h
File src/counters.h (right):

https://codereview.chromium.org/572293002/diff/20001/src/counters.h#newcode297
src/counters.h:297: HR(gc_idle_time_limit_exceeded, V8.GCIdleTimeLimitExceeded,
0, 10000, 101) \
For me, overshot and undershot would be clearer. Exceeded is fine but missed is
so overloaded.

https://codereview.chromium.org/572293002/diff/20001/src/heap/heap.cc
File src/heap/heap.cc (right):

https://codereview.chromium.org/572293002/diff/20001/src/heap/heap.cc#newcode...
src/heap/heap.cc:4357: }
What about the perfect sample? Should we add it to the "undershot" histogram?

[Hannes Payer (out of office), 2014-09-16 14:29:35]

LGTM, two nits

https://codereview.chromium.org/572293002/diff/20001/src/counters.h
File src/counters.h (right):

https://codereview.chromium.org/572293002/diff/20001/src/counters.h#newcode297
src/counters.h:297: HR(gc_idle_time_limit_exceeded, V8.GCIdleTimeLimitExceeded,
0, 10000, 101) \
For me, overshot and undershot would be clearer. Exceeded is fine but missed is
so overloaded.

https://codereview.chromium.org/572293002/diff/20001/src/heap/heap.cc
File src/heap/heap.cc (right):

https://codereview.chromium.org/572293002/diff/20001/src/heap/heap.cc#newcode...
src/heap/heap.cc:4357: }
What about the perfect sample? Should we add it to the "undershot" histogram?

[jochen (gone - plz use gerrit), 2014-09-16 16:18:11]

Committed patchset #3 (id:40001) manually as 23981 (presubmit successful).