Add histogram for DB_SEEK

Summary: as title Test Plan: make release Reviewers: sdong, yhchiang Reviewed By: yhchiang Subscribers: leveldb Differential Revision: https://reviews.facebook.net/D21717
tdfischer · Aug 13, 2014 · 5a5953b · 5a5953b
1 parent 5e64240
commit 5a5953b
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diff --git a/db/db_iter.cc b/db/db_iter.cc
@@ -552,6 +552,8 @@ void DBIter::FindParseableKey(ParsedInternalKey* ikey, Direction direction) {
 }
 
 void DBIter::Seek(const Slice& target) {
+  StopWatch sw(env_, statistics_, DB_SEEK);
+
   saved_key_.Clear();
   // now savved_key is used to store internal key.
   saved_key_.SetInternalKey(target, sequence_);

diff --git a/include/rocksdb/statistics.h b/include/rocksdb/statistics.h
@@ -219,6 +219,7 @@ enum Histograms : uint32_t {
   HARD_RATE_LIMIT_DELAY_COUNT,
   SOFT_RATE_LIMIT_DELAY_COUNT,
   NUM_FILES_IN_SINGLE_COMPACTION,
+  DB_SEEK,
   HISTOGRAM_ENUM_MAX,
 };
 
@@ -241,6 +242,7 @@ const std::vector<std::pair<Histograms, std::string>> HistogramsNameMap = {
   { HARD_RATE_LIMIT_DELAY_COUNT, "rocksdb.hard.rate.limit.delay.count"},
   { SOFT_RATE_LIMIT_DELAY_COUNT, "rocksdb.soft.rate.limit.delay.count"},
   { NUM_FILES_IN_SINGLE_COMPACTION, "rocksdb.numfiles.in.singlecompaction" },
+  { DB_SEEK, "rocksdb.db.seek.micros" },
 };
 
 struct HistogramData {