2 * @file frescan_bwres_analysis.c
4 * @brief FRESCAN bandwith reservation layer: sched analysis
10 * @author Daniel Sangorrin <daniel.sangorrin@unican.es>
14 * This module contains the scheduling analysis functions for the
15 * admission tests and spare capacity distribution of the bandwith
16 * reservation (bwres) layer.
18 * The module "frescan_bwres_mode_change" must be used to apply finally this
19 * new parameters to the sporadic servers following an appropriate mode
24 * -----------------------------------------------------------------------
25 * Copyright (C) 2006 - 2008 FRESCOR consortium partners:
27 * Universidad de Cantabria, SPAIN
28 * University of York, UK
29 * Scuola Superiore Sant'Anna, ITALY
30 * Kaiserslautern University, GERMANY
31 * Univ. Politécnica Valencia, SPAIN
32 * Czech Technical University in Prague, CZECH REPUBLIC
34 * Thales Communication S.A. FRANCE
35 * Visual Tools S.A. SPAIN
36 * Rapita Systems Ltd UK
39 * See http://www.frescor.org for a link to partners' websites
41 * FRESCOR project (FP6/2005/IST/5-034026) is funded
42 * in part by the European Union Sixth Framework Programme
43 * The European Union is not liable of any use that may be
46 * This file is part of FRESCAN
48 * FRESCAN is free software; you can redistribute it and/or modify
49 * it under the terms of the GNU General Public License as published by
50 * the Free Software Foundation; either version 2, or (at your option)
53 * FRESCAN is distributed in the hope that it will be useful, but
54 * WITHOUT ANY WARRANTY; without even the implied warranty of
55 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
56 * General Public License for more details.
58 * You should have received a copy of the GNU General Public License
59 * distributed with FRESCAN; see file COPYING. If not, write to the
60 * Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
63 * As a special exception, including FRESCAN header files in a file,
64 * instantiating FRESCAN generics or templates, or linking other files
65 * with FRESCAN objects to produce an executable application, does not
66 * by itself cause the resulting executable application to be covered
67 * by the GNU General Public License. This exception does not
68 * however invalidate any other reasons why the executable file might be
69 * covered by the GNU Public License.
70 * -----------------------------------------------------------------------
75 #include <misc/timespec_operations.h>
76 #include <misc/linux_list.h>
77 #include <misc/freelist.h>
78 #include "frescan_bwres_analysis.h"
79 #include "frescan_debug.h"
82 * frescan_bwres_sa_init() - init the scenario
84 * Initialize the vres list and copy the initialization parameters
87 int frescan_bwres_sa_init(frescan_bwres_sa_scenario_t *scenario,
88 const frescan_bwres_sa_init_params_t *params)
91 frsh_sa_scenario_init_data_t fsa_scenario_init_data;
93 INIT_LIST_HEAD(&scenario->vres_head.list);
94 scenario->init_params = *params;
96 ret = freelist_init(&scenario->fsa_vres_global_id_freelist,
97 FRESCAN_MX_NODES*FRESCAN_MX_IDS);
98 if (ret != 0) return ret;
100 fsa_scenario_init_data.min_priority = params->min_prio;
101 fsa_scenario_init_data.max_priority = params->max_prio;
102 fsa_scenario_init_data.ovhd_data.np =
103 frsh_rel_time_to_sa_time(frsh_usec_to_rel_time(0));
105 DEBUG(FRESCAN_BWRES_SA_ENABLE_DEBUG,
106 "init the scenario min_prio:%d max_prio:%d\n",
107 params->min_prio, params->max_prio);
109 ret = frsh_sa_scenario_init(&scenario->fsa_scenario,
110 &fsa_scenario_init_data);
111 if (ret != 0) return -1;
117 * frescan_bwres_sa_add_contract() - add a contract to the scenario
119 * create the corresponding vres structure and set its values, and add the
120 * vres to the vres list
123 int frescan_bwres_sa_add_contract(frescan_bwres_sa_scenario_t *scenario,
126 const frsh_contract_t *contract)
129 frescan_bwres_vres_t *sa_vres = &scenario->vres_pool[node][ss];
131 sa_vres->contract = *contract;
132 sa_vres->node = node;
138 ret = freelist_alloc(&scenario->fsa_vres_global_id_freelist);
139 if (ret < 0) return -1;
141 sa_vres->fsa_vres_global_id = (frsh_sa_vres_id_t)ret;
143 list_add_tail(&sa_vres->list,
144 &scenario->vres_head.list);
146 DEBUG(FRESCAN_BWRES_SA_ENABLE_DEBUG,
147 "add contract, node:%d ss:%d globalid:%d\n",
148 node, ss, sa_vres->fsa_vres_global_id);
150 DEBUG(FRESCAN_BWRES_SA_ENABLE_DEBUG,
151 "contract bmin=(%u,%u) tmax=(%u,%u) bmax=(%u,%u) tmin=(%u,%u) prio=%u\n",
152 contract->budget_min.tv_sec,
153 contract->budget_min.tv_nsec,
154 contract->period_max.tv_sec,
155 contract->period_max.tv_nsec,
156 contract->budget_max.tv_sec,
157 contract->budget_max.tv_nsec,
158 contract->period_min.tv_sec,
159 contract->period_min.tv_nsec,
160 contract->preemption_level);
162 ret = frsh_sa_scenario_add_vres(&scenario->fsa_scenario,
164 sa_vres->fsa_vres_global_id);
165 if (ret != 0) return -1;
171 * frescan_bwres_sa_update_contract() - update a contract in the scenario
174 int frescan_bwres_sa_update_contract(frescan_bwres_sa_scenario_t *scenario,
177 const frsh_contract_t *contract,
178 frsh_contract_t *old_contract)
181 frescan_bwres_vres_t *sa_vres = &scenario->vres_pool[node][ss];
183 if (old_contract != NULL) {
184 *old_contract = sa_vres->contract;
187 sa_vres->contract = *contract;
189 DEBUG(FRESCAN_BWRES_SA_ENABLE_DEBUG,
190 "update contract node:%d ss:%d globalid:%d\n",
191 node, ss, sa_vres->fsa_vres_global_id);
193 ret = frsh_sa_scenario_modify_vres(&scenario->fsa_scenario,
194 sa_vres->fsa_vres_global_id,
196 if (ret != 0) return -1;
202 * frescan_bwres_sa_remove_contract() - remove a contract from the scenario
205 int frescan_bwres_sa_remove_contract(frescan_bwres_sa_scenario_t *scenario,
208 frsh_contract_t *contract)
211 frescan_bwres_vres_t *sa_vres = &scenario->vres_pool[node][ss];
213 if (contract != NULL) {
214 *contract = sa_vres->contract;
217 DEBUG(FRESCAN_BWRES_SA_ENABLE_DEBUG,
218 "remove contract, node:%d ss:%d globalid:%d\n",
219 node, ss, sa_vres->fsa_vres_global_id);
221 ret = frsh_sa_scenario_del_vres(&scenario->fsa_scenario,
222 sa_vres->fsa_vres_global_id);
223 if (ret != 0) return -1;
225 ret = freelist_free(&scenario->fsa_vres_global_id_freelist,
226 sa_vres->fsa_vres_global_id);
227 if (ret < 0) return -1;
229 list_del(&sa_vres->list);
235 * frescan_bwres_sa_sched_test() - perform a scheduling test on the scenario
239 int frescan_bwres_sa_sched_test(frescan_bwres_sa_scenario_t *scenario,
240 bool *is_schedulable)
244 DEBUG(FRESCAN_BWRES_SA_ENABLE_DEBUG, "init the fsa scenario\n");
246 ret = frsh_sa_init_analysis(&scenario->fsa_scenario);
247 if (ret != 0) return -1;
249 ret = frsh_sa_assign_priorities(&scenario->fsa_scenario);
250 if (ret != 0) return -1;
252 DEBUG(FRESCAN_BWRES_SA_ENABLE_DEBUG, "do scheduling test\n");
254 ret = frsh_sa_sched_test(&scenario->fsa_scenario, is_schedulable);
255 if (ret != 0) return -1;
257 DEBUG(FRESCAN_BWRES_SA_ENABLE_DEBUG, "%s\n",
258 (*is_schedulable) ? "OK" : "FAILED");
264 * frescan_bwres_sa_spare_capacity() - distribute the spare capacity
267 int frescan_bwres_sa_spare_capacity(frescan_bwres_sa_scenario_t *scenario)
271 DEBUG(FRESCAN_BWRES_SA_ENABLE_DEBUG, "distribute sc\n");
273 ret = frsh_sa_distribute_spare(&scenario->fsa_scenario);
274 if (ret != 0) return -1;