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// -*- 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) 2018 Red Hat
*
* 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 CEPH_PRIORITY_CACHE_H
#define CEPH_PRIORITY_CACHE_H
#include <stdint.h>
#include <string>
#include <vector>
#include <memory>
#include <unordered_map>
#include "common/perf_counters.h"
#include "include/ceph_assert.h"
namespace PriorityCache {
// Reserve 16384 slots for PriorityCache perf counters
const int PERF_COUNTER_LOWER_BOUND = 1073741824;
const int PERF_COUNTER_MAX_BOUND = 1073758208;
enum MallocStats {
M_FIRST = PERF_COUNTER_LOWER_BOUND,
M_TARGET_BYTES,
M_MAPPED_BYTES,
M_UNMAPPED_BYTES,
M_HEAP_BYTES,
M_CACHE_BYTES,
M_LAST,
};
enum Priority {
PRI0,
PRI1,
PRI2,
PRI3,
PRI4,
PRI5,
PRI6,
PRI7,
PRI8,
PRI9,
PRI10,
PRI11,
LAST = PRI11,
};
enum Extra {
E_RESERVED = Priority::LAST+1,
E_COMMITTED,
E_LAST = E_COMMITTED,
};
int64_t get_chunk(uint64_t usage, uint64_t total_bytes);
struct PriCache {
virtual ~PriCache();
/* Ask the cache to request memory for the given priority. Note that the
* cache may ultimately be allocated less memory than it requests here.
*/
virtual int64_t request_cache_bytes(PriorityCache::Priority pri, uint64_t total_cache) const = 0;
// Get the number of bytes currently allocated to the given priority.
virtual int64_t get_cache_bytes(PriorityCache::Priority pri) const = 0;
// Get the number of bytes currently allocated to all priorities.
virtual int64_t get_cache_bytes() const = 0;
// Allocate bytes for a given priority.
virtual void set_cache_bytes(PriorityCache::Priority pri, int64_t bytes) = 0;
// Allocate additional bytes for a given priority.
virtual void add_cache_bytes(PriorityCache::Priority pri, int64_t bytes) = 0;
/* Commit the current number of bytes allocated to the cache. Space is
* allocated in chunks based on the allocation size and current total size
* of memory available for caches. */
virtual int64_t commit_cache_size(uint64_t total_cache) = 0;
/* Get the current number of bytes allocated to the cache. this may be
* larger than the value returned by get_cache_bytes as it includes extra
* space for future growth. */
virtual int64_t get_committed_size() const = 0;
// Get the ratio of available memory this cache should target.
virtual double get_cache_ratio() const = 0;
// Set the ratio of available memory this cache should target.
virtual void set_cache_ratio(double ratio) = 0;
// Get the name of this cache.
virtual std::string get_cache_name() const = 0;
};
class Manager {
CephContext* cct = nullptr;
PerfCounters* logger;
std::unordered_map<std::string, PerfCounters*> loggers;
std::unordered_map<std::string, std::vector<int>> indexes;
std::unordered_map<std::string, std::shared_ptr<PriCache>> caches;
// Start perf counter slots after the malloc stats.
int cur_index = MallocStats::M_LAST;
uint64_t min_mem = 0;
uint64_t max_mem = 0;
uint64_t target_mem = 0;
uint64_t tuned_mem = 0;
bool reserve_extra;
std::string name;
public:
Manager(CephContext *c, uint64_t min, uint64_t max, uint64_t target,
bool reserve_extra, const std::string& name = std::string());
~Manager();
void set_min_memory(uint64_t min) {
min_mem = min;
}
void set_max_memory(uint64_t max) {
max_mem = max;
}
void set_target_memory(uint64_t target) {
target_mem = target;
}
uint64_t get_tuned_mem() const {
return tuned_mem;
}
void insert(const std::string& name, const std::shared_ptr<PriCache> c,
bool enable_perf_counters);
void erase(const std::string& name);
void clear();
void tune_memory();
void balance();
private:
void balance_priority(int64_t *mem_avail, Priority pri);
};
}
#endif
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