fix db_bench rate limiter callsites

Summary:
pass nullptr as stats object for db_bench-specific rate limiters since its stats are intended to capture background write activity only.
Closes https://github.com/facebook/rocksdb/pull/1997

Differential Revision: D4726806

Pulled By: ajkr

fbshipit-source-id: 8e4b225

tools/db_bench_tool.cc

@@ -3343,8 +3343,8 @@ class Benchmark {
 
       if (thread->shared->write_rate_limiter.get() != nullptr) {
         thread->shared->write_rate_limiter->Request(
-            entries_per_batch_ * (value_size_ + key_size_),
-            Env::IO_HIGH);
+            entries_per_batch_ * (value_size_ + key_size_), Env::IO_HIGH,
+            nullptr /* stats */);
         // Set time at which last op finished to Now() to hide latency and
         // sleep from rate limiter. Also, do the check once per batch, not
         // once per write.
@@ -3704,7 +3704,8 @@ class Benchmark {
 
       if (thread->shared->read_rate_limiter.get() != nullptr &&
           i % 1024 == 1023) {
-        thread->shared->read_rate_limiter->Request(1024, Env::IO_HIGH);
+        thread->shared->read_rate_limiter->Request(1024, Env::IO_HIGH,
+                                                   nullptr /* stats */);
       }
     }
 
@@ -3735,7 +3736,8 @@ class Benchmark {
       ++i;
       if (thread->shared->read_rate_limiter.get() != nullptr &&
           i % 1024 == 1023) {
-        thread->shared->read_rate_limiter->Request(1024, Env::IO_HIGH);
+        thread->shared->read_rate_limiter->Request(1024, Env::IO_HIGH,
+                                                   nullptr /* stats */);
       }
     }
     delete iter;
@@ -3776,7 +3778,8 @@ class Benchmark {
         }
       }
       if (thread->shared->read_rate_limiter.get() != nullptr) {
-        thread->shared->read_rate_limiter->Request(100, Env::IO_HIGH);
+        thread->shared->read_rate_limiter->Request(100, Env::IO_HIGH,
+                                                   nullptr /* stats */);
       }
 
       thread->stats.FinishedOps(nullptr, db, 100, kRead);
@@ -3860,7 +3863,8 @@ class Benchmark {
 
       if (thread->shared->read_rate_limiter.get() != nullptr &&
           read % 256 == 255) {
-        thread->shared->read_rate_limiter->Request(256, Env::IO_HIGH);
+        thread->shared->read_rate_limiter->Request(256, Env::IO_HIGH,
+                                                   nullptr /* stats */);
       }
 
       thread->stats.FinishedOps(db_with_cfh, db_with_cfh->db, 1, kRead);
@@ -3915,8 +3919,8 @@ class Benchmark {
       }
       if (thread->shared->read_rate_limiter.get() != nullptr &&
           num_multireads % 256 == 255) {
-        thread->shared->read_rate_limiter->Request(256 * entries_per_batch_,
-                                                   Env::IO_HIGH);
+        thread->shared->read_rate_limiter->Request(
+            256 * entries_per_batch_, Env::IO_HIGH, nullptr /* stats */);
       }
       thread->stats.FinishedOps(nullptr, db, entries_per_batch_, kRead);
     }
@@ -4013,7 +4017,8 @@ class Benchmark {
 
       if (thread->shared->read_rate_limiter.get() != nullptr &&
           read % 256 == 255) {
-        thread->shared->read_rate_limiter->Request(256, Env::IO_HIGH);
+        thread->shared->read_rate_limiter->Request(256, Env::IO_HIGH,
+                                                   nullptr /* stats */);
       }
 
       thread->stats.FinishedOps(&db_, db_.db, 1, kSeek);
@@ -4143,8 +4148,8 @@ class Benchmark {
 
       if (FLAGS_benchmark_write_rate_limit > 0) {
         write_rate_limiter->Request(
-            entries_per_batch_ * (value_size_ + key_size_),
-            Env::IO_HIGH);
+            entries_per_batch_ * (value_size_ + key_size_), Env::IO_HIGH,
+            nullptr /* stats */);
       }
     }
     thread->stats.AddBytes(bytes);
@@ -4815,7 +4820,8 @@ class Benchmark {
       found += key_found;
 
       if (thread->shared->read_rate_limiter.get() != nullptr) {
-        thread->shared->read_rate_limiter->Request(1, Env::IO_HIGH);
+        thread->shared->read_rate_limiter->Request(1, Env::IO_HIGH,
+                                                   nullptr /* stats */);
       }
     }
     delete iter;
@@ -4885,7 +4891,8 @@ class Benchmark {
 
       if (FLAGS_benchmark_write_rate_limit > 0) {
         write_rate_limiter->Request(
-            entries_per_batch_ * (value_size_ + key_size_), Env::IO_HIGH);
+            entries_per_batch_ * (value_size_ + key_size_), Env::IO_HIGH,
+            nullptr /* stats */);
       }
     }
   }