ceph/src/os/bluestore/ZonedAllocator.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 //
   5 // A simple allocator that just hands out space from the next empty zone.  This
   6 // is temporary, just to get the simplest append-only write workload to work.
   7 //
   8 // Copyright (C) 2020 Abutalib Aghayev
   9 //
  10
  11 #ifndef CEPH_OS_BLUESTORE_ZONEDALLOCATOR_H
  12 #define CEPH_OS_BLUESTORE_ZONEDALLOCATOR_H
  13
  14 #include <mutex>
  15
  16 #include "Allocator.h"
  17 #include "common/ceph_mutex.h"
  18 #include "include/btree_map.h"
  19 #include "include/interval_set.h"
  20 #include "include/mempool.h"
  21 #include "bluestore_types.h"
  22 #include "zoned_types.h"
  23
  24 class ZonedAllocator : public Allocator {
  25   CephContext* cct;
  26
  27   // Currently only one thread at a time calls into ZonedAllocator due to
  28   // atomic_alloc_and_submit_lock in BlueStore.cc, but we do locking anyway
  29   // because eventually ZONE_APPEND support will land and
  30   // atomic_alloc_and_submit_lock will be removed.
  31   ceph::mutex lock = ceph::make_mutex("ZonedAllocator::lock");
  32
  33   std::atomic<int64_t> num_free;     ///< total bytes in freelist
  34   uint64_t size;
  35   uint64_t block_size;
  36   uint64_t zone_size;
  37   uint64_t starting_zone_num;
  38   uint64_t num_zones;
  39   std::vector<zone_state_t> zone_states;
  40
  41   inline uint64_t get_offset(uint64_t zone_num) const {
  42     return zone_num * zone_size + get_write_pointer(zone_num);
  43   }
  44
  45   inline uint64_t get_write_pointer(uint64_t zone_num) const {
  46     return zone_states[zone_num].get_write_pointer();
  47   }
  48
  49   inline uint64_t get_remaining_space(uint64_t zone_num) const {
  50     return zone_size - get_write_pointer(zone_num);
  51   }
  52
  53   inline void advance_write_pointer(uint64_t zone_num, uint64_t want_size) {
  54     zone_states[zone_num].increment_write_pointer(want_size);
  55   }
  56
  57   inline bool fits(uint64_t want_size, uint64_t zone_num) const {
  58     return want_size <= get_remaining_space(zone_num);
  59   }
  60
  61 public:
  62   ZonedAllocator(CephContext* cct, int64_t size, int64_t block_size,
  63                  const std::string& name);
  64   ~ZonedAllocator() override;
  65
  66   const char *get_type() const override {
  67     return "zoned";
  68   }
  69
  70   int64_t allocate(
  71     uint64_t want_size, uint64_t alloc_unit, uint64_t max_alloc_size,
  72     int64_t hint, PExtentVector *extents) override;
  73
  74   void release(const interval_set<uint64_t>& release_set) override;
  75
  76   uint64_t get_free() override;
  77
  78   void dump() override;
  79   void dump(std::function<void(uint64_t offset,
  80                                uint64_t length)> notify) override;
  81
  82   void zoned_set_zone_states(std::vector<zone_state_t> &&_zone_states) override;
  83   bool zoned_get_zones_to_clean(std::deque<uint64_t> *zones_to_clean) override;
  84
  85   void init_add_free(uint64_t offset, uint64_t length) override;
  86   void init_rm_free(uint64_t offset, uint64_t length) override;
  87
  88   void shutdown() override;
  89 };
  90
  91 #endif