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Diffstat (limited to '')
| -rw-r--r-- | src/os/filestore/WBThrottle.h | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/src/os/filestore/WBThrottle.h b/src/os/filestore/WBThrottle.h new file mode 100644 index 00000000..ef809ea4 --- /dev/null +++ b/src/os/filestore/WBThrottle.h @@ -0,0 +1,187 @@ +// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- +// vim: ts=8 sw=2 smarttab +/* + * Ceph - scalable distributed file system + * + * Copyright (C) 2013 Inktank Storage, Inc. + * + * This is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License version 2.1, as published by the Free Software + * Foundation. See file COPYING. + * + */ + +#ifndef WBTHROTTLE_H +#define WBTHROTTLE_H + +#include "include/unordered_map.h" +#include <boost/tuple/tuple.hpp> +#include "common/Formatter.h" +#include "common/hobject.h" +#include "include/interval_set.h" +#include "FDCache.h" +#include "common/Thread.h" +#include "common/ceph_context.h" + +class PerfCounters; +enum { + l_wbthrottle_first = 999090, + l_wbthrottle_bytes_dirtied, + l_wbthrottle_bytes_wb, + l_wbthrottle_ios_dirtied, + l_wbthrottle_ios_wb, + l_wbthrottle_inodes_dirtied, + l_wbthrottle_inodes_wb, + l_wbthrottle_last +}; + +/** + * WBThrottle + * + * Tracks, throttles, and flushes outstanding IO + */ +class WBThrottle : Thread, public md_config_obs_t { + ghobject_t clearing; + /* *_limits.first is the start_flusher limit and + * *_limits.second is the hard limit + */ + + /// Limits on unflushed bytes + pair<uint64_t, uint64_t> size_limits; + + /// Limits on unflushed ios + pair<uint64_t, uint64_t> io_limits; + + /// Limits on unflushed objects + pair<uint64_t, uint64_t> fd_limits; + + uint64_t cur_ios; /// Currently unflushed IOs + uint64_t cur_size; /// Currently unflushed bytes + + /** + * PendingWB tracks the ios pending on an object. + */ + class PendingWB { + public: + bool nocache; + uint64_t size; + uint64_t ios; + PendingWB() : nocache(true), size(0), ios(0) {} + void add(bool _nocache, uint64_t _size, uint64_t _ios) { + if (!_nocache) + nocache = false; // only nocache if all writes are nocache + size += _size; + ios += _ios; + } + }; + + CephContext *cct; + PerfCounters *logger; + bool stopping; + Mutex lock; + Cond cond; + + + /** + * Flush objects in lru order + */ + list<ghobject_t> lru; + ceph::unordered_map<ghobject_t, list<ghobject_t>::iterator> rev_lru; + void remove_object(const ghobject_t &oid) { + ceph_assert(lock.is_locked()); + ceph::unordered_map<ghobject_t, list<ghobject_t>::iterator>::iterator iter = + rev_lru.find(oid); + if (iter == rev_lru.end()) + return; + + lru.erase(iter->second); + rev_lru.erase(iter); + } + ghobject_t pop_object() { + ceph_assert(!lru.empty()); + ghobject_t oid(lru.front()); + lru.pop_front(); + rev_lru.erase(oid); + return oid; + } + void insert_object(const ghobject_t &oid) { + ceph_assert(rev_lru.find(oid) == rev_lru.end()); + lru.push_back(oid); + rev_lru.insert(make_pair(oid, --lru.end())); + } + + ceph::unordered_map<ghobject_t, pair<PendingWB, FDRef> > pending_wbs; + + /// get next flush to perform + bool get_next_should_flush( + boost::tuple<ghobject_t, FDRef, PendingWB> *next ///< [out] next to flush + ); ///< @return false if we are shutting down +public: + enum FS { + BTRFS, + XFS + }; + +private: + FS fs; + + void set_from_conf(); + bool beyond_limit() const { + if (cur_ios < io_limits.first && + pending_wbs.size() < fd_limits.first && + cur_size < size_limits.first) + return false; + else + return true; + } + bool need_flush() const { + if (cur_ios < io_limits.second && + pending_wbs.size() < fd_limits.second && + cur_size < size_limits.second) + return false; + else + return true; + } + +public: + explicit WBThrottle(CephContext *cct); + ~WBThrottle() override; + + void start(); + void stop(); + /// Set fs as XFS or BTRFS + void set_fs(FS new_fs) { + Mutex::Locker l(lock); + fs = new_fs; + set_from_conf(); + } + + /// Queue wb on oid, fd taking throttle (does not block) + void queue_wb( + FDRef fd, ///< [in] FDRef to oid + const ghobject_t &oid, ///< [in] object + uint64_t offset, ///< [in] offset written + uint64_t len, ///< [in] length written + bool nocache ///< [in] try to clear out of cache after write + ); + + /// Clear all wb (probably due to sync) + void clear(); + + /// Clear object + void clear_object(const ghobject_t &oid); + + /// Block until there is throttle available + void throttle(); + + /// md_config_obs_t + const char** get_tracked_conf_keys() const override; + void handle_conf_change(const ConfigProxy& conf, + const std::set<std::string> &changed) override; + + /// Thread + void *entry() override; +}; + +#endif |