SimpleCache: more histograms watching how index is loaded.
The index is stale in about 50% of cases and often takes longer than 10s to restore. We need to watch this closer: looking at sizes of the cache on load, speculating on per-entry overhead for loading. BUG=none Review URL: https://chromiumcodereview.appspot.com/16286015 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@204619 0039d316-1c4b-4281-b951-d872f2087c98
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@ -301,7 +301,9 @@ void SimpleIndexFile::LoadIndexEntriesInternal(
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const base::TimeTicks start = base::TimeTicks::Now();
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index_file_entries = LoadFromDisk(index_file_path);
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UMA_HISTOGRAM_TIMES("SimpleCache.IndexLoadTime",
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(base::TimeTicks::Now() - start));
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base::TimeTicks::Now() - start);
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UMA_HISTOGRAM_COUNTS("SimpleCache.IndexEntriesLoaded",
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index_file_entries->size());
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}
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UMA_HISTOGRAM_BOOLEAN("SimpleCache.IndexStale", index_stale);
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@ -310,8 +312,10 @@ void SimpleIndexFile::LoadIndexEntriesInternal(
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if (!index_file_entries) {
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const base::TimeTicks start = base::TimeTicks::Now();
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index_file_entries = RestoreFromDisk(index_file_path);
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UMA_HISTOGRAM_TIMES("SimpleCache.IndexRestoreTime",
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(base::TimeTicks::Now() - start));
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UMA_HISTOGRAM_MEDIUM_TIMES("SimpleCache.IndexRestoreTime",
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base::TimeTicks::Now() - start);
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UMA_HISTOGRAM_COUNTS("SimpleCache.IndexEntriesRestored",
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index_file_entries->size());
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// When we restore from disk we write the merged index file to disk right
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// away, this might save us from having to restore again next time.
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@ -10028,6 +10028,17 @@ other types of suffix sets.
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<summary>The number of entries in a newly created index file.</summary>
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</histogram>
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<histogram name="SimpleCache.IndexEntriesLoaded">
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<summary>Number of entries loaded from the index file on start.</summary>
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</histogram>
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<histogram name="SimpleCache.IndexEntriesRestored">
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<summary>
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Number of entries restored from disk when there was no index or the index
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was corrupted.
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</summary>
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</histogram>
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<histogram name="SimpleCache.IndexInitializationWaiters">
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<summary>
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At the time of index initialization, the number of enqueued jobs awaiting
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