Disk cache: More instrumentation for the cache.

Now we separate data between before and after the cache
is full. Also, reduce the rate at which a particular
client sends data to be only once a week. The effect is
that the histogram data will only have one value per client,
and the same client will not be "voting" on more than one
version (release) at the same time.


Review URL: http://codereview.chromium.org/50063

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@12218 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 36 insertions, 0 deletions

diff --git a/net/disk_cache/stats.cc b/net/disk_cache/stats.cc
index 46c41a0..4f9440e 100644
--- a/net/disk_cache/stats.cc
+++ b/net/disk_cache/stats.cc
@@ -54,6 +54,8 @@ static const char* kCounterNames[] = {
   "Open rankings",
   "Get rankings",
   "Fatal error",
+  "Last report",
+  "Last report timer"
 };
 COMPILE_ASSERT(arraysize(kCounterNames) == disk_cache::Stats::MAX_COUNTER,
                update_the_names);
@@ -257,6 +259,40 @@ void Stats::GetItems(StatsItems* items) {
   }
 }
 
+int Stats::GetHitRatio() const {
+  return GetRatio(OPEN_HIT, OPEN_MISS);
+}
+
+int Stats::GetResurrectRatio() const {
+  return GetRatio(RESURRECT_HIT, CREATE_HIT);
+}
+
+int Stats::GetRatio(Counters hit, Counters miss) const {
+  int64 ratio = GetCounter(hit) * 100;
+  if (!ratio)
+    return 0;
+
+  ratio /= (GetCounter(hit) + GetCounter(miss));
+  return static_cast<int>(ratio);
+}
+
+void Stats::ResetRatios() {
+  SetCounter(OPEN_HIT, 0);
+  SetCounter(OPEN_MISS, 0);
+  SetCounter(RESURRECT_HIT, 0);
+  SetCounter(CREATE_HIT, 0);
+}
+
+int Stats::GetLargeEntriesSize() {
+  int total = 0;
+  // data_sizes_[20] stores values between 512 KB and 1 MB (see comment before
+  // GetStatsBucket()).
+  for (int bucket = 20; bucket < kDataSizesLength; bucket++)
+    total += data_sizes_[bucket] * GetBucketRange(bucket);
+
+  return total;
+}
+
 void Stats::Store() {
   if (!backend_)
     return;