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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) 2019 Red Hat 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.
*
*/
#pragma once
#include <seastar/core/future.hh>
#include <ostream>
#include "crimson/common/config_proxy.h"
namespace crimson::osd::scheduler {
enum class scheduler_class_t : uint8_t {
background_best_effort = 0,
background_recovery,
client,
repop,
immediate,
};
std::ostream &operator<<(std::ostream &, const scheduler_class_t &);
using client_t = uint64_t;
using cost_t = uint64_t;
struct params_t {
cost_t cost = 1;
client_t owner;
scheduler_class_t klass;
};
struct item_t {
params_t params;
seastar::promise<> wake;
};
/**
* Base interface for classes responsible for choosing
* op processing order in the OSD.
*/
class Scheduler {
public:
// Enqueue op for scheduling
virtual void enqueue(item_t &&item) = 0;
// Enqueue op for processing as though it were enqueued prior
// to other items already scheduled.
virtual void enqueue_front(item_t &&item) = 0;
// Returns true iff there are no ops scheduled
virtual bool empty() const = 0;
// Return next op to be processed
virtual item_t dequeue() = 0;
// Dump formatted representation for the queue
virtual void dump(ceph::Formatter &f) const = 0;
// Print human readable brief description with relevant parameters
virtual void print(std::ostream &out) const = 0;
// Destructor
virtual ~Scheduler() {};
};
std::ostream &operator<<(std::ostream &lhs, const Scheduler &);
using SchedulerRef = std::unique_ptr<Scheduler>;
SchedulerRef make_scheduler(ConfigProxy &);
}
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