ceph/src/rocksdb/include/rocksdb/iostats_context.h

   1 // Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
   2 //  This source code is licensed under both the GPLv2 (found in the
   3 //  COPYING file in the root directory) and Apache 2.0 License
   4 //  (found in the LICENSE.Apache file in the root directory).
   5 #pragma once
   6
   7 #include <stdint.h>
   8 #include <string>
   9
  10 #include "rocksdb/perf_level.h"
  11
  12 // A thread local context for gathering io-stats efficiently and transparently.
  13 // Use SetPerfLevel(PerfLevel::kEnableTime) to enable time stats.
  14
  15 namespace rocksdb {
  16
  17 struct IOStatsContext {
  18   // reset all io-stats counter to zero
  19   void Reset();
  20
  21   std::string ToString(bool exclude_zero_counters = false) const;
  22
  23   // the thread pool id
  24   uint64_t thread_pool_id;
  25
  26   // number of bytes that has been written.
  27   uint64_t bytes_written;
  28   // number of bytes that has been read.
  29   uint64_t bytes_read;
  30
  31   // time spent in open() and fopen().
  32   uint64_t open_nanos;
  33   // time spent in fallocate().
  34   uint64_t allocate_nanos;
  35   // time spent in write() and pwrite().
  36   uint64_t write_nanos;
  37   // time spent in read() and pread()
  38   uint64_t read_nanos;
  39   // time spent in sync_file_range().
  40   uint64_t range_sync_nanos;
  41   // time spent in fsync
  42   uint64_t fsync_nanos;
  43   // time spent in preparing write (fallocate etc).
  44   uint64_t prepare_write_nanos;
  45   // time spent in Logger::Logv().
  46   uint64_t logger_nanos;
  47   // CPU time spent in write() and pwrite()
  48   uint64_t cpu_write_nanos;
  49   // CPU time spent in read() and pread()
  50   uint64_t cpu_read_nanos;
  51 };
  52
  53 // Get Thread-local IOStatsContext object pointer
  54 IOStatsContext* get_iostats_context();
  55
  56 }  // namespace rocksdb