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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) 2013 Inktank Storage, Inc.
*
* 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 WBTHROTTLE_H
#define WBTHROTTLE_H
#include <map>
#include <boost/tuple/tuple.hpp>
#include <tr1/memory>
#include "include/buffer.h"
#include "common/Formatter.h"
#include "os/hobject.h"
#include "include/interval_set.h"
#include "FDCache.h"
#include "common/Thread.h"
#include "common/ceph_context.h"
/**
* WBThrottle
*
* Tracks, throttles, and flushes outstanding IO
*/
class WBThrottle : Thread, public md_config_obs_t {
hobject_t clearing;
/// Limits on unflushed bytes
pair<uint64_t, uint64_t> size_limits;
/// Limits on unflushed ios
pair<uint64_t, uint64_t> io_limits;
/// Limits on unflushed objects
pair<uint64_t, uint64_t> fd_limits;
uint64_t cur_ios; /// Currently unflushed IOs
uint64_t cur_size; /// Currently unflushed bytes
/**
* PendingWB tracks the ios pending on an object.
*/
class PendingWB {
public:
bool replica;
uint64_t size;
uint64_t ios;
PendingWB() : replica(true), size(0), ios(0) {}
void add(bool _replica, uint64_t _size, uint64_t _ios) {
if (!_replica)
replica = false; // only replica if all writes are replica
size += _size;
ios += _ios;
}
};
CephContext *cct;
bool stopping;
Mutex lock;
Cond cond;
/**
* Flush objects in lru order
*/
list<hobject_t> lru;
map<hobject_t, list<hobject_t>::iterator> rev_lru;
void remove_object(const hobject_t &hoid) {
assert(lock.is_locked());
map<hobject_t, list<hobject_t>::iterator>::iterator iter =
rev_lru.find(hoid);
if (iter == rev_lru.end())
return;
lru.erase(iter->second);
rev_lru.erase(iter);
}
hobject_t pop_object() {
assert(!lru.empty());
hobject_t hoid(lru.front());
lru.pop_front();
rev_lru.erase(hoid);
return hoid;
}
void insert_object(const hobject_t &hoid) {
assert(rev_lru.find(hoid) == rev_lru.end());
lru.push_back(hoid);
rev_lru.insert(make_pair(hoid, --lru.end()));
}
map<hobject_t, pair<PendingWB, FDRef> > pending_wbs;
/// get next flush to perform
bool get_next_should_flush(
boost::tuple<hobject_t, FDRef, PendingWB> *next ///< [out] next to flush
); ///< @return false if we are shutting down
public:
enum FS {
BTRFS,
XFS
};
private:
FS fs;
void set_from_conf();
public:
WBThrottle(CephContext *cct);
~WBThrottle();
/// Set fs as XFS or BTRFS
void set_fs(FS new_fs) {
Mutex::Locker l(lock);
fs = new_fs;
set_from_conf();
}
/// Queue wb on hoid, fd taking throttle (does not block)
void queue_wb(
FDRef fd, ///< [in] FDRef to hoid
const hobject_t &hoid, ///< [in] object
uint64_t offset, ///< [in] offset written
uint64_t len, ///< [in] length written
bool replica ///< [in] write is for replica
);
/// Clear all wb (probably due to sync)
void clear();
/// Clear object
void clear_object(const hobject_t &hoid);
/// Block until there is throttle available
void throttle();
/// md_config_obs_t
const char** get_tracked_conf_keys() const;
void handle_conf_change(const md_config_t *conf,
const std::set<std::string> &changed);
/// Thread
void *entry();
};
#endif
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