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
  15 class StupidAllocator : public Allocator {
  16   CephContext* cct;
  17   std::mutex lock;
  18
  19   int64_t num_free;     ///< total bytes in freelist
  20   int64_t num_reserved; ///< reserved bytes
  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);
  39   ~StupidAllocator() override;
  40
  41   int reserve(uint64_t need) override;
  42   void unreserve(uint64_t unused) override;
  43
  44   int64_t allocate(
  45     uint64_t want_size, uint64_t alloc_unit, uint64_t max_alloc_size,
  46     int64_t hint, mempool::bluestore_alloc::vector<AllocExtent> *extents) override;
  47
  48   int64_t allocate_int(
  49     uint64_t want_size, uint64_t alloc_unit, int64_t hint,
  50     uint64_t *offset, uint32_t *length);
  51
  52   void release(
  53     uint64_t offset, uint64_t length) override;
  54
  55   uint64_t get_free() override;
  56
  57   void dump() override;
  58
  59   void init_add_free(uint64_t offset, uint64_t length) override;
  60   void init_rm_free(uint64_t offset, uint64_t length) override;
  61
  62   void shutdown() override;
  63 };
  64
  65 #endif