src/ceph/src/os/filestore/WBThrottle.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #include "acconfig.h"
   5
   6 #include "os/filestore/WBThrottle.h"
   7 #include "common/perf_counters.h"
   8
   9 WBThrottle::WBThrottle(CephContext *cct) :
  10   cur_ios(0), cur_size(0),
  11   cct(cct),
  12   logger(NULL),
  13   stopping(true),
  14   lock("WBThrottle::lock", false, true, false, cct),
  15   fs(XFS)
  16 {
  17   {
  18     Mutex::Locker l(lock);
  19     set_from_conf();
  20   }
  21   assert(cct);
  22   PerfCountersBuilder b(
  23     cct, string("WBThrottle"),
  24     l_wbthrottle_first, l_wbthrottle_last);
  25   b.add_u64(l_wbthrottle_bytes_dirtied, "bytes_dirtied", "Dirty data");
  26   b.add_u64(l_wbthrottle_bytes_wb, "bytes_wb", "Written data");
  27   b.add_u64(l_wbthrottle_ios_dirtied, "ios_dirtied", "Dirty operations");
  28   b.add_u64(l_wbthrottle_ios_wb, "ios_wb", "Written operations");
  29   b.add_u64(l_wbthrottle_inodes_dirtied, "inodes_dirtied", "Entries waiting for write");
  30   b.add_u64(l_wbthrottle_inodes_wb, "inodes_wb", "Written entries");
  31   logger = b.create_perf_counters();
  32   cct->get_perfcounters_collection()->add(logger);
  33   for (unsigned i = l_wbthrottle_first + 1; i != l_wbthrottle_last; ++i)
  34     logger->set(i, 0);
  35
  36   cct->_conf->add_observer(this);
  37 }
  38
  39 WBThrottle::~WBThrottle() {
  40   assert(cct);
  41   cct->get_perfcounters_collection()->remove(logger);
  42   delete logger;
  43   cct->_conf->remove_observer(this);
  44 }
  45
  46 void WBThrottle::start()
  47 {
  48   {
  49     Mutex::Locker l(lock);
  50     stopping = false;
  51   }
  52   create("wb_throttle");
  53 }
  54
  55 void WBThrottle::stop()
  56 {
  57   {
  58     Mutex::Locker l(lock);
  59     stopping = true;
  60     cond.Signal();
  61   }
  62
  63   join();
  64 }
  65
  66 const char** WBThrottle::get_tracked_conf_keys() const
  67 {
  68   static const char* KEYS[] = {
  69     "filestore_wbthrottle_btrfs_bytes_start_flusher",
  70     "filestore_wbthrottle_btrfs_bytes_hard_limit",
  71     "filestore_wbthrottle_btrfs_ios_start_flusher",
  72     "filestore_wbthrottle_btrfs_ios_hard_limit",
  73     "filestore_wbthrottle_btrfs_inodes_start_flusher",
  74     "filestore_wbthrottle_btrfs_inodes_hard_limit",
  75     "filestore_wbthrottle_xfs_bytes_start_flusher",
  76     "filestore_wbthrottle_xfs_bytes_hard_limit",
  77     "filestore_wbthrottle_xfs_ios_start_flusher",
  78     "filestore_wbthrottle_xfs_ios_hard_limit",
  79     "filestore_wbthrottle_xfs_inodes_start_flusher",
  80     "filestore_wbthrottle_xfs_inodes_hard_limit",
  81     NULL
  82   };
  83   return KEYS;
  84 }
  85
  86 void WBThrottle::set_from_conf()
  87 {
  88   assert(lock.is_locked());
  89   if (fs == BTRFS) {
  90     size_limits.first =
  91       cct->_conf->filestore_wbthrottle_btrfs_bytes_start_flusher;
  92     size_limits.second =
  93       cct->_conf->filestore_wbthrottle_btrfs_bytes_hard_limit;
  94     io_limits.first =
  95       cct->_conf->filestore_wbthrottle_btrfs_ios_start_flusher;
  96     io_limits.second =
  97       cct->_conf->filestore_wbthrottle_btrfs_ios_hard_limit;
  98     fd_limits.first =
  99       cct->_conf->filestore_wbthrottle_btrfs_inodes_start_flusher;
 100     fd_limits.second =
 101       cct->_conf->filestore_wbthrottle_btrfs_inodes_hard_limit;
 102   } else if (fs == XFS) {
 103     size_limits.first =
 104       cct->_conf->filestore_wbthrottle_xfs_bytes_start_flusher;
 105     size_limits.second =
 106       cct->_conf->filestore_wbthrottle_xfs_bytes_hard_limit;
 107     io_limits.first =
 108       cct->_conf->filestore_wbthrottle_xfs_ios_start_flusher;
 109     io_limits.second =
 110       cct->_conf->filestore_wbthrottle_xfs_ios_hard_limit;
 111     fd_limits.first =
 112       cct->_conf->filestore_wbthrottle_xfs_inodes_start_flusher;
 113     fd_limits.second =
 114       cct->_conf->filestore_wbthrottle_xfs_inodes_hard_limit;
 115   } else {
 116     assert(0 == "invalid value for fs");
 117   }
 118   cond.Signal();
 119 }
 120
 121 void WBThrottle::handle_conf_change(const md_config_t *conf,
 122                                     const std::set<std::string> &changed)
 123 {
 124   Mutex::Locker l(lock);
 125   for (const char** i = get_tracked_conf_keys(); *i; ++i) {
 126     if (changed.count(*i)) {
 127       set_from_conf();
 128       return;
 129     }
 130   }
 131 }
 132
 133 bool WBThrottle::get_next_should_flush(
 134   boost::tuple<ghobject_t, FDRef, PendingWB> *next)
 135 {
 136   assert(lock.is_locked());
 137   assert(next);
 138   while (!stopping && !beyond_limit())
 139          cond.Wait(lock);
 140   if (stopping)
 141     return false;
 142   assert(!pending_wbs.empty());
 143   ghobject_t obj(pop_object());
 144
 145   ceph::unordered_map<ghobject_t, pair<PendingWB, FDRef> >::iterator i =
 146     pending_wbs.find(obj);
 147   *next = boost::make_tuple(obj, i->second.second, i->second.first);
 148   pending_wbs.erase(i);
 149   return true;
 150 }
 151
 152
 153 void *WBThrottle::entry()
 154 {
 155   Mutex::Locker l(lock);
 156   boost::tuple<ghobject_t, FDRef, PendingWB> wb;
 157   while (get_next_should_flush(&wb)) {
 158     clearing = wb.get<0>();
 159     cur_ios -= wb.get<2>().ios;
 160     logger->dec(l_wbthrottle_ios_dirtied, wb.get<2>().ios);
 161     logger->inc(l_wbthrottle_ios_wb, wb.get<2>().ios);
 162     cur_size -= wb.get<2>().size;
 163     logger->dec(l_wbthrottle_bytes_dirtied, wb.get<2>().size);
 164     logger->inc(l_wbthrottle_bytes_wb, wb.get<2>().size);
 165     logger->dec(l_wbthrottle_inodes_dirtied);
 166     logger->inc(l_wbthrottle_inodes_wb);
 167     lock.Unlock();
 168 #ifdef HAVE_FDATASYNC
 169     ::fdatasync(**wb.get<1>());
 170 #else
 171     ::fsync(**wb.get<1>());
 172 #endif
 173 #ifdef HAVE_POSIX_FADVISE
 174     if (cct->_conf->filestore_fadvise && wb.get<2>().nocache) {
 175       int fa_r = posix_fadvise(**wb.get<1>(), 0, 0, POSIX_FADV_DONTNEED);
 176       assert(fa_r == 0);
 177     }
 178 #endif
 179     lock.Lock();
 180     clearing = ghobject_t();
 181     cond.Signal();
 182     wb = boost::tuple<ghobject_t, FDRef, PendingWB>();
 183   }
 184   return 0;
 185 }
 186
 187 void WBThrottle::queue_wb(
 188   FDRef fd, const ghobject_t &hoid, uint64_t offset, uint64_t len,
 189   bool nocache)
 190 {
 191   Mutex::Locker l(lock);
 192   ceph::unordered_map<ghobject_t, pair<PendingWB, FDRef> >::iterator wbiter =
 193     pending_wbs.find(hoid);
 194   if (wbiter == pending_wbs.end()) {
 195     wbiter = pending_wbs.insert(
 196       make_pair(hoid,
 197         make_pair(
 198           PendingWB(),
 199           fd))).first;
 200     logger->inc(l_wbthrottle_inodes_dirtied);
 201   } else {
 202     remove_object(hoid);
 203   }
 204
 205   cur_ios++;
 206   logger->inc(l_wbthrottle_ios_dirtied);
 207   cur_size += len;
 208   logger->inc(l_wbthrottle_bytes_dirtied, len);
 209
 210   wbiter->second.first.add(nocache, len, 1);
 211   insert_object(hoid);
 212   if (beyond_limit())
 213     cond.Signal();
 214 }
 215
 216 void WBThrottle::clear()
 217 {
 218   Mutex::Locker l(lock);
 219   for (ceph::unordered_map<ghobject_t, pair<PendingWB, FDRef> >::iterator i =
 220          pending_wbs.begin();
 221        i != pending_wbs.end();
 222        ++i) {
 223 #ifdef HAVE_POSIX_FADVISE
 224     if (cct->_conf->filestore_fadvise && i->second.first.nocache) {
 225       int fa_r = posix_fadvise(**i->second.second, 0, 0, POSIX_FADV_DONTNEED);
 226       assert(fa_r == 0);
 227     }
 228 #endif
 229
 230   }
 231   cur_ios = cur_size = 0;
 232   logger->set(l_wbthrottle_ios_dirtied, 0);
 233   logger->set(l_wbthrottle_bytes_dirtied, 0);
 234   logger->set(l_wbthrottle_inodes_dirtied, 0);
 235   pending_wbs.clear();
 236   lru.clear();
 237   rev_lru.clear();
 238   cond.Signal();
 239 }
 240
 241 void WBThrottle::clear_object(const ghobject_t &hoid)
 242 {
 243   Mutex::Locker l(lock);
 244   while (clearing == hoid)
 245     cond.Wait(lock);
 246   ceph::unordered_map<ghobject_t, pair<PendingWB, FDRef> >::iterator i =
 247     pending_wbs.find(hoid);
 248   if (i == pending_wbs.end())
 249     return;
 250
 251   cur_ios -= i->second.first.ios;
 252   logger->dec(l_wbthrottle_ios_dirtied, i->second.first.ios);
 253   cur_size -= i->second.first.size;
 254   logger->dec(l_wbthrottle_bytes_dirtied, i->second.first.size);
 255   logger->dec(l_wbthrottle_inodes_dirtied);
 256
 257   pending_wbs.erase(i);
 258   remove_object(hoid);
 259   cond.Signal();
 260 }
 261
 262 void WBThrottle::throttle()
 263 {
 264   Mutex::Locker l(lock);
 265   while (!stopping && need_flush())
 266     cond.Wait(lock);
 267 }