ceph/src/os/bluestore/StupidAllocator.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #ifndef CEPH_OS_BLUESTORE_STUPIDALLOCATOR_H
   5 #define CEPH_OS_BLUESTORE_STUPIDALLOCATOR_H
   6
   7 #include <mutex>
   8
   9 #include "Allocator.h"
  10 #include "include/btree_map.h"
  11 #include "include/interval_set.h"
  12 #include "os/bluestore/bluestore_types.h"
  13 #include "include/mempool.h"
  14 #include "common/ceph_mutex.h"
  15
  16 class StupidAllocator : public Allocator {
  17   CephContext* cct;
  18   ceph::mutex lock = ceph::make_mutex("StupidAllocator::lock");
  19
  20   int64_t num_free;     ///< total bytes in freelist
  21
  22   typedef mempool::bluestore_alloc::pool_allocator<
  23     pair<const uint64_t,uint64_t>> allocator_t;
  24   typedef btree::btree_map<uint64_t,uint64_t,std::less<uint64_t>,allocator_t> interval_set_map_t;
  25   typedef interval_set<uint64_t,interval_set_map_t> interval_set_t;
  26   std::vector<interval_set_t> free;  ///< leading-edge copy
  27
  28   uint64_t last_alloc;
  29
  30   unsigned _choose_bin(uint64_t len);
  31   void _insert_free(uint64_t offset, uint64_t len);
  32
  33   uint64_t _aligned_len(
  34     interval_set_t::iterator p,
  35     uint64_t alloc_unit);
  36
  37 public:
  38   StupidAllocator(CephContext* cct, const std::string& name = "");
  39   ~StupidAllocator() override;
  40
  41   int64_t allocate(
  42     uint64_t want_size, uint64_t alloc_unit, uint64_t max_alloc_size,
  43     int64_t hint, PExtentVector *extents) override;
  44
  45   int64_t allocate_int(
  46     uint64_t want_size, uint64_t alloc_unit, int64_t hint,
  47     uint64_t *offset, uint32_t *length);
  48
  49   void release(
  50     const interval_set<uint64_t>& release_set) override;
  51
  52   uint64_t get_free() override;
  53   double get_fragmentation(uint64_t alloc_unit) override;
  54
  55   void dump() override;
  56   void dump(std::function<void(uint64_t offset, uint64_t length)> notify) override;
  57
  58   void init_add_free(uint64_t offset, uint64_t length) override;
  59   void init_rm_free(uint64_t offset, uint64_t length) override;
  60
  61   void shutdown() override;
  62 };
  63
  64 #endif