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   int64_t block_size;
  22
  23   typedef mempool::bluestore_alloc::pool_allocator<
  24     pair<const uint64_t,uint64_t>> allocator_t;
  25   typedef btree::btree_map<uint64_t,uint64_t,std::less<uint64_t>,allocator_t> interval_set_map_t;
  26   typedef interval_set<uint64_t,interval_set_map_t> interval_set_t;
  27   std::vector<interval_set_t> free;  ///< leading-edge copy
  28
  29   uint64_t last_alloc = 0;
  30
  31   unsigned _choose_bin(uint64_t len);
  32   void _insert_free(uint64_t offset, uint64_t len);
  33
  34   uint64_t _aligned_len(
  35     interval_set_t::iterator p,
  36     uint64_t alloc_unit);
  37
  38 public:
  39   StupidAllocator(CephContext* cct, const std::string& name, int64_t block_size);
  40   ~StupidAllocator() override;
  41
  42   int64_t allocate(
  43     uint64_t want_size, uint64_t alloc_unit, uint64_t max_alloc_size,
  44     int64_t hint, PExtentVector *extents) override;
  45
  46   int64_t allocate_int(
  47     uint64_t want_size, uint64_t alloc_unit, int64_t hint,
  48     uint64_t *offset, uint32_t *length);
  49
  50   void release(
  51     const interval_set<uint64_t>& release_set) override;
  52
  53   uint64_t get_free() override;
  54   double get_fragmentation() override;
  55
  56   void dump() override;
  57   void dump(std::function<void(uint64_t offset, uint64_t length)> notify) 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