Disk cache histograms tracking cache opens by size/age of cache.
Disk cache histograms tracking cache opens by size/age of cache.

These histograms compliment the other hit rate histograms I added in http://codereview.chromium.org/10911040/ , but instead of reporting by time interval, they report at each open. By comparing the Miss/Hit version of each histogram, you can get a rate in the same way that the stochastic interval-reporting version has.

This set of histograms will have different biasses than the time series data, as users who do a lot of operations will be represented more heavily.

As an added bonus, I'm also tracking the open time of cache misses, since that's shown up in http_cache_transaction as being interesting.

R=rvargas@chromium.org
BUG=None


Review URL: https://chromiumcodereview.appspot.com/10909126

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@156758 0039d316-1c4b-4281-b951-d872f2087c98

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