1 /* context_raw - context switching with ucontextes from System V */
3 /* Copyright (c) 2009, 2010. The SimGrid Team.
4 * All rights reserved. */
6 /* This program is free software; you can redistribute it and/or modify it
7 * under the terms of the license (GNU LGPL) which comes with this package. */
9 #include "simix/private.h"
10 #include "xbt/parmap.h"
13 #ifdef HAVE_VALGRIND_VALGRIND_H
14 # include <valgrind/valgrind.h>
15 #endif /* HAVE_VALGRIND_VALGRIND_H */
17 typedef char * raw_stack_t;
18 typedef void (*rawctx_entry_point_t)(void *);
20 typedef struct s_smx_ctx_raw {
21 s_smx_ctx_base_t super; /* Fields of super implementation */
22 char *malloced_stack; /* malloced area containing the stack */
23 raw_stack_t stack_top; /* pointer to stack top (within previous area) */
24 raw_stack_t old_stack_top; /* to whom I should return the control */
25 #ifdef HAVE_VALGRIND_VALGRIND_H
26 unsigned int valgrind_stack_id; /* the valgrind stack id */
29 unsigned int thread; /* Just for measuring purposes */
31 } s_smx_ctx_raw_t, *smx_ctx_raw_t;
33 smx_ctx_raw_t maestro_raw_context;
35 extern raw_stack_t raw_makecontext(char* malloced_stack, int stack_size,
36 rawctx_entry_point_t entry_point, void* arg);
37 extern void raw_swapcontext(raw_stack_t* old, raw_stack_t new);
42 ".globl raw_makecontext\n"
43 ".type raw_makecontext,@function\n"
45 " movl 4(%esp),%eax\n" /* stack */
46 " addl 8(%esp),%eax\n" /* size */
47 " movl 12(%esp),%ecx\n" /* func */
48 " movl 16(%esp),%edx\n" /* arg */
49 " movl %edx, -4(%eax)\n"
50 " movl $0, -8(%eax)\n" /* @return for func */
51 " movl %ecx,-12(%eax)\n"
52 " movl $0, -16(%eax)\n" /* ebp */
53 " movl $0, -20(%eax)\n" /* ebx */
54 " movl $0, -24(%eax)\n" /* esi */
55 " movl $0, -28(%eax)\n" /* edi */
62 ".globl raw_swapcontext\n"
63 ".type raw_swapcontext,@function\n"
65 " movl 4(%esp),%eax\n" /* old */
66 " movl 8(%esp),%edx\n" /* new */
79 #elif PROCESSOR_x86_64
82 ".globl raw_makecontext\n"
83 ".type raw_makecontext,@function\n"
84 "raw_makecontext:\n" /* Calling convention sets the arguments in rdi, rsi, rdx and rcx, respectively */
85 " movq %rdi,%rax\n" /* stack */
86 " addq %rsi,%rax\n" /* size */
87 " movq $0, -8(%rax)\n" /* @return for func */
88 " movq %rdx,-16(%rax)\n" /* func */
89 " movq %rcx,-24(%rax)\n" /* arg/rdi */
90 " movq $0, -32(%rax)\n" /* rsi */
91 " movq $0, -40(%rax)\n" /* rdx */
92 " movq $0, -48(%rax)\n" /* rcx */
93 " movq $0, -56(%rax)\n" /* r8 */
94 " movq $0, -64(%rax)\n" /* r9 */
95 " movq $0, -72(%rax)\n" /* rbp */
96 " movq $0, -80(%rax)\n" /* rbx */
97 " movq $0, -88(%rax)\n" /* r12 */
98 " movq $0, -96(%rax)\n" /* r13 */
99 " movq $0, -104(%rax)\n" /* r14 */
100 " movq $0, -112(%rax)\n" /* r15 */
107 ".globl raw_swapcontext\n"
108 ".type raw_swapcontext,@function\n"
109 "raw_swapcontext:\n" /* Calling convention sets the arguments in rdi and rsi, respectively */
122 " movq %rsp,(%rdi)\n" /* old */
123 " movq %rsi,%rsp\n" /* new */
139 raw_stack_t raw_makecontext(char* malloced_stack, int stack_size,
140 rawctx_entry_point_t entry_point, void* arg) {
144 void raw_swapcontext(raw_stack_t* old, raw_stack_t new) {
150 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
152 #ifdef CONTEXT_THREADS
153 static xbt_parmap_t parmap;
156 static smx_context_factory_t raw_factory;
159 #include "xbt/xbt_os_time.h"
160 #define NUM_THREADS 4
161 static xbt_os_timer_t timer;
162 static double time_thread_sr[NUM_THREADS];
163 static double time_thread_ssr[NUM_THREADS];
164 static double time_wasted_sr = 0;
165 static double time_wasted_ssr = 0;
166 static unsigned int sr_count = 0;
167 static unsigned int ssr_count = 0;
168 static char new_sr = 0;
171 static void smx_ctx_raw_wrapper(smx_ctx_raw_t context);
173 static int smx_ctx_raw_factory_finalize(smx_context_factory_t *factory)
176 XBT_CRITICAL("Total wasted time in %u SR: %lf", sr_count, time_wasted_sr);
177 XBT_CRITICAL("Total wasted time in %u SSR: %lf", ssr_count, time_wasted_ssr);
180 #ifdef CONTEXT_THREADS
182 xbt_parmap_destroy(parmap);
184 return smx_ctx_base_factory_finalize(factory);
189 smx_ctx_raw_create_context(xbt_main_func_t code, int argc, char **argv,
190 void_pfn_smxprocess_t cleanup_func,
194 smx_ctx_raw_t context =
195 (smx_ctx_raw_t) smx_ctx_base_factory_create_context_sized(
196 sizeof(s_smx_ctx_raw_t),
203 /* If the user provided a function for the process then use it
204 otherwise is the context for maestro */
206 context->malloced_stack = xbt_malloc0(smx_context_stack_size);
208 raw_makecontext(context->malloced_stack, smx_context_stack_size,
209 (void(*)(void*))smx_ctx_raw_wrapper,context);
211 #ifdef HAVE_VALGRIND_VALGRIND_H
212 context->valgrind_stack_id =
213 VALGRIND_STACK_REGISTER(context->malloced_stack,
214 context->malloced_stack + smx_context_stack_size);
215 #endif /* HAVE_VALGRIND_VALGRIND_H */
218 maestro_raw_context = context;
221 return (smx_context_t) context;
224 static void smx_ctx_raw_free(smx_context_t context)
229 #ifdef HAVE_VALGRIND_VALGRIND_H
230 VALGRIND_STACK_DEREGISTER(((smx_ctx_raw_t)
231 context)->valgrind_stack_id);
232 #endif /* HAVE_VALGRIND_VALGRIND_H */
234 free(((smx_ctx_raw_t)context)->malloced_stack);
236 smx_ctx_base_free(context);
239 static void smx_ctx_raw_suspend(smx_context_t context)
241 smx_current_context = (smx_context_t)maestro_raw_context;
243 &((smx_ctx_raw_t) context)->stack_top,
244 ((smx_ctx_raw_t) context)->old_stack_top);
247 static void smx_ctx_raw_stop(smx_context_t context)
249 smx_ctx_base_stop(context);
250 smx_ctx_raw_suspend(context);
253 static void smx_ctx_raw_wrapper(smx_ctx_raw_t context)
255 (context->super.code) (context->super.argc, context->super.argv);
257 smx_ctx_raw_stop((smx_context_t) context);
260 static void smx_ctx_raw_resume(smx_process_t process)
262 smx_ctx_raw_t context = (smx_ctx_raw_t)process->context;
263 smx_current_context = (smx_context_t)context;
265 &((smx_ctx_raw_t) context)->old_stack_top,
266 ((smx_ctx_raw_t) context)->stack_top);
270 static void smx_ctx_raw_runall_serial(xbt_dynar_t processes)
272 smx_process_t process;
277 unsigned long num_proc = xbt_dynar_length(processes);
279 unsigned int data_size = (num_proc / NUM_THREADS) + ((num_proc % NUM_THREADS) ? 1 : 0);
282 time_thread_ssr[0] = 0;
283 xbt_dynar_foreach(processes, cursor, process) {
284 XBT_DEBUG("Schedule item %u of %lu",cursor,xbt_dynar_length(processes));
285 if(cursor >= t * data_size + data_size){
286 if(time_thread_ssr[t] > tmax)
287 tmax = time_thread_ssr[t];
289 time_thread_ssr[t] = 0;
293 ((smx_ctx_raw_t)process->context)->thread = t;
294 time_thread_sr[t] = 0;
297 xbt_os_timer_start(timer);
298 smx_ctx_raw_resume(process);
299 xbt_os_timer_stop(timer);
300 elapsed = xbt_os_timer_elapsed(timer);
301 time_thread_ssr[t] += elapsed;
302 time_thread_sr[((smx_ctx_raw_t)process->context)->thread] += elapsed;
308 if(time_thread_ssr[t] > tmax)
309 tmax = time_thread_ssr[t];
311 for(cursor=0; cursor <= t; cursor++){
312 XBT_VERB("Time SSR thread %u = %lf (max %lf)", cursor, time_thread_ssr[cursor], tmax);
313 time_wasted_ssr += tmax - time_thread_ssr[cursor];
316 xbt_dynar_reset(processes);
319 void smx_ctx_raw_new_sr(void);
320 void smx_ctx_raw_new_sr(void)
326 for(i=0; i < NUM_THREADS; i++){
327 if(time_thread_sr[i] > tmax)
328 tmax = time_thread_sr[i];
331 for(i=0; i < NUM_THREADS; i++){
332 XBT_VERB("Time SR thread %u = %lf (max %lf)", i, time_thread_sr[i], tmax);
333 time_wasted_sr += tmax - time_thread_sr[i];
336 XBT_VERB("New scheduling round");
339 static void smx_ctx_raw_runall_serial(xbt_dynar_t processes)
341 smx_process_t process;
344 xbt_dynar_foreach(processes, cursor, process) {
345 XBT_DEBUG("Schedule item %u of %lu",cursor,xbt_dynar_length(processes));
346 smx_ctx_raw_resume(process);
348 xbt_dynar_reset(processes);
352 static void smx_ctx_raw_runall_parallel(xbt_dynar_t processes)
354 #ifdef CONTEXT_THREADS
355 xbt_parmap_apply(parmap, (void_f_pvoid_t)smx_ctx_raw_resume, processes);
357 xbt_dynar_reset(processes);
360 static smx_context_t smx_ctx_raw_self_parallel(void)
362 return smx_current_context;
365 static int smx_ctx_raw_get_thread_id(){
366 return (int)(unsigned long)xbt_os_thread_get_extra_data();
369 static void smx_ctx_raw_runall(xbt_dynar_t processes)
371 if (xbt_dynar_length(processes) >= SIMIX_context_get_parallel_threshold()) {
372 XBT_DEBUG("Runall // %lu", xbt_dynar_length(processes));
373 raw_factory->self = smx_ctx_raw_self_parallel;
374 raw_factory->get_thread_id = smx_ctx_raw_get_thread_id;
375 smx_ctx_raw_runall_parallel(processes);
377 XBT_DEBUG("Runall serial %lu", xbt_dynar_length(processes));
378 raw_factory->self = smx_ctx_base_self;
379 raw_factory->get_thread_id = smx_ctx_base_get_thread_id;
380 smx_ctx_raw_runall_serial(processes);
384 void SIMIX_ctx_raw_factory_init(smx_context_factory_t *factory)
386 XBT_VERB("Using raw contexts. Because the glibc is just not good enough for us.");
387 smx_ctx_base_factory_init(factory);
389 (*factory)->finalize = smx_ctx_raw_factory_finalize;
390 (*factory)->create_context = smx_ctx_raw_create_context;
391 /* Do not overload that method (*factory)->finalize */
392 (*factory)->free = smx_ctx_raw_free;
393 (*factory)->stop = smx_ctx_raw_stop;
394 (*factory)->suspend = smx_ctx_raw_suspend;
395 (*factory)->name = "smx_raw_context_factory";
397 if (SIMIX_context_is_parallel()) {
398 #ifdef CONTEXT_THREADS
399 parmap = xbt_parmap_new(SIMIX_context_get_nthreads());
401 if (SIMIX_context_get_parallel_threshold() > 1) {
402 /* choose dynamically */
403 (*factory)->runall = smx_ctx_raw_runall;
406 /* always parallel */
407 (*factory)->self = smx_ctx_raw_self_parallel;
408 (*factory)->get_thread_id = smx_ctx_raw_get_thread_id;
409 (*factory)->runall = smx_ctx_raw_runall_parallel;
414 (*factory)->self = smx_ctx_base_self;
415 (*factory)->get_thread_id = smx_ctx_base_get_thread_id;
416 (*factory)->runall = smx_ctx_raw_runall_serial;
418 raw_factory = *factory;
420 timer = xbt_os_timer_new();