resource-lp.c 16.8 KB
Newer Older
1 2 3 4 5 6 7 8 9 10
/*
 * Copyright (C) 2014 University of Chicago.
 * See COPYRIGHT notice in top-level directory.
 *
*/

#include "codes/resource-lp.h"
#include "codes/resource.h"
#include "codes/codes_mapping.h"
#include "codes/jenkins-hash.h"
11
#include "codes/quicklist.h"
12 13 14
#include "ross.h"
#include <assert.h>
#include <stdio.h>
15
#include <string.h>
16 17 18 19 20 21 22 23 24 25 26 27


/**** BEGIN SIMULATION DATA STRUCTURES ****/

static int resource_magic; /* use this as sanity check on events */
/* TODO: we currently use a single config value to initialize the resource unit
 * count for all resources in the system. Later on, we'll want to do this on a
 * per-group basis */
static uint64_t avail_global;

typedef struct resource_state resource_state;
typedef struct resource_msg resource_msg;
28
typedef struct pending_op pending_op;
29 30 31 32 33 34

#define TOKEN_DUMMY ((resource_token_t)-1)

/* event types */
enum resource_event
{
35
    RESOURCE_GET = 100,
36
    RESOURCE_FREE,
37
    RESOURCE_DEQ,
38 39 40 41 42
    RESOURCE_RESERVE,
};

struct resource_state {
    resource r;
43 44 45 46 47 48
    /* pending operations - if OOM and we are using the 'blocking' method, 
     * then need to stash parameters.
     * Index 0 is the general pool, index 1.. are the reservation-specific
     * pools. We take advantage of resource_token_t's status as a simple 
     * array index to do the proper indexing */
    struct qlist_head pending[MAX_RESERVE+1];
49 50
};

51 52 53
/* following struct exists because we want to basically cache a message within
 * a message for rc (ewww) */
struct resource_msg_internal{
54 55 56 57
    msg_header h;
    /* request data */
    uint64_t req;
    resource_token_t tok; /* only for reserved calls */
58 59 60 61 62
    /* behavior when sending response to caller
     * 0 - send the callback immediately if resource unavailable. 
     * 1 - send the callback when memory is available (danger - deadlock
     * possible) */
    int block_on_unavail; 
63 64 65 66 67
    /* callback data */
    msg_header h_callback;
    int msg_size;
    int msg_header_offset;
    int msg_callback_offset;
68 69 70 71
    /* user-provided data */
    int msg_callback_misc_size;
    int msg_callback_misc_offset;
    char msg_callback_misc[RESOURCE_MAX_CALLBACK_PAYLOAD];
72 73 74 75 76 77 78 79 80
}; 

struct resource_msg {
    struct resource_msg_internal i, i_rc;
};

struct pending_op {
    struct resource_msg_internal m;
    struct qlist_head ql;
81 82 83 84 85 86 87 88
};

/**** END SIMULATION DATA STRUCTURES ****/

/**** BEGIN LP, EVENT PROCESSING FUNCTION DECLS ****/

/* ROSS LP processing functions */  
static void resource_lp_ind_init(
89 90
        resource_state * ns,
        tw_lp * lp);
91
static void resource_event_handler(
92 93 94 95
        resource_state * ns,
        tw_bf * b,
        resource_msg * m,
        tw_lp * lp);
96
static void resource_rev_handler(
97 98 99 100
        resource_state * ns,
        tw_bf * b,
        resource_msg * m,
        tw_lp * lp);
101
static void resource_finalize(
102 103
        resource_state * ns,
        tw_lp * lp);
104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123

/* ROSS function pointer table for this LP */
static tw_lptype resource_lp = {
     (init_f) resource_lp_ind_init,
     (event_f) resource_event_handler,
     (revent_f) resource_rev_handler,
     (final_f)  resource_finalize, 
     (map_f) codes_mapping,
     sizeof(resource_state),
};

/**** END LP, EVENT PROCESSING FUNCTION DECLS ****/

/**** BEGIN IMPLEMENTATIONS ****/

void resource_lp_ind_init(
        resource_state * ns,
        tw_lp * lp){
    /* currently use global to initialize, may need to have other LPs init */
    resource_init(avail_global, &ns->r);
124 125 126 127 128 129 130
    int i;
    for (i = 0; i < MAX_RESERVE+1; i++){
        INIT_QLIST_HEAD(&ns->pending[i]);
    }
}

static void resource_response(
Jonathan Jenkins's avatar
oops!  
Jonathan Jenkins committed
131
        struct resource_msg_internal *m,
132 133 134 135 136
        tw_lp *lp,
        int ret,
        resource_token_t tok){
    /* send return message */
    msg_header h;
137
    msg_set_header(m->h_callback.magic, m->h_callback.event_type, 
138 139 140 141 142 143 144
            lp->gid, &h);

    resource_callback c;
    c.ret = ret;
    c.tok = tok;

    /* before we send the message, sanity check the sizes */
145 146 147 148
    if (m->msg_size >= m->msg_header_offset+sizeof(h) &&
            m->msg_size >= m->msg_callback_offset+sizeof(c) &&
            m->msg_size >= m->msg_callback_offset+m->msg_callback_misc_size){
        tw_event *e = codes_event_new(m->h_callback.src, 
149 150
                codes_local_latency(lp), lp);
        void *msg = tw_event_data(e);
151 152 153 154 155
        memcpy(((char*)msg)+m->msg_header_offset, &h, sizeof(h));
        memcpy(((char*)msg)+m->msg_callback_offset, &c, sizeof(c));
        if (m->msg_callback_misc_size > 0){
            memcpy(((char*)msg)+m->msg_callback_misc_offset, 
                        m->msg_callback_misc, m->msg_callback_misc_size);
156
        }
157 158 159 160
        tw_event_send(e);
    }
    else{
        tw_error(TW_LOC, 
161
                "message size not large enough to hold header/callback/misc"
162 163 164 165
                " structures\n"
                "msg size: %3d, header   off/size:  %d, %d\n"
                "               callback off/size:  %d, %d\n"
                "               callback misc size: %d",
166 167 168
                m->msg_size, m->msg_header_offset, (int)sizeof(h),
                m->msg_callback_offset, (int)sizeof(c),
                m->msg_callback_misc_size);
169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195
    }
}
static void resource_response_rc(tw_lp *lp){
    codes_local_latency_reverse(lp);
}

/* bitfield usage:
 * c0 - enqueued a message 
 * c1 - sent an ack 
 * c2 - successfully got the resource */
static void handle_resource_get(
        resource_state * ns,
        tw_bf * b,
        resource_msg * m,
        tw_lp * lp){
    int ret = 1;
    int send_ack = 1;
    if (!qlist_empty(&ns->pending[m->i.tok]) || 
            (ret = resource_get(m->i.req, m->i.tok, &ns->r))){
        /* failed to receive data */
        assert(ret != 2);
        if (m->i.block_on_unavail){
            /* queue up operation, save til later */
            b->c0 = 1;
            pending_op *op = malloc(sizeof(pending_op));
            op->m = m->i; /* no need to set rc msg here */
            qlist_add_tail(&op->ql, &ns->pending[m->i.tok]);
196
            send_ack = 0;
197 198 199 200
        }
    }
    if (send_ack){
        b->c1 = 1;
201
        resource_response(&m->i, lp, ret, TOKEN_DUMMY);
202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253
    }

    b->c2 = !ret;
}

/* bitfield usage:
 * c0 - enqueued a message 
 * c1 - sent an ack 
 * c2 - successfully got the resource */
static void handle_resource_get_rc(
        resource_state * ns,
        tw_bf * b,
        resource_msg * m,
        tw_lp * lp){
    if (b->c0){
        assert(!qlist_empty(&ns->pending[m->i.tok]));
        struct qlist_head *ql = qlist_pop_back(&ns->pending[m->i.tok]);
        free(qlist_entry(ql, pending_op, ql));
    }
    else if (b->c1){
        resource_response_rc(lp);
    }

    if (b->c2){
        int ret = resource_free(m->i.req, m->i.tok, &ns->r);
        assert(ret != 2);
    }
}

static void handle_resource_free(
        resource_state * ns,
        tw_bf * b,
        resource_msg * m,
        tw_lp * lp){
    assert(!resource_free(m->i.req, m->i.tok, &ns->r));
    /* create an event to pop the next queue item */
    tw_event *e = codes_event_new(lp->gid, codes_local_latency(lp), lp);
    resource_msg *m_deq = tw_event_data(e);
    msg_set_header(resource_magic, RESOURCE_DEQ, lp->gid, &m_deq->i.h);
    m_deq->i.tok = m->i.tok; /* only tok is needed, all others grabbed from q */
    tw_event_send(e);
}
static void handle_resource_free_rc(
        resource_state * ns,
        tw_bf * b,
        resource_msg * m,
        tw_lp * lp){
    assert(!resource_get(m->i.req, m->i.tok, &ns->r));
    codes_local_latency_reverse(lp);
}

/* bitfield usage:
254 255
 * c0 - queue was empty to begin with
 * c1 - assuming !c0, alloc succeeded */ 
256 257 258 259 260 261 262
static void handle_resource_deq(
        resource_state * ns,
        tw_bf * b,
        resource_msg * m,
        tw_lp * lp){
    if (qlist_empty(&ns->pending[m->i.tok])){
        /* nothing to do */
263
        b->c0 = 1;
264 265 266 267 268 269 270 271
        return;
    }

    struct qlist_head *front = ns->pending[m->i.tok].next;
    pending_op *p = qlist_entry(front, pending_op, ql);
    int ret = resource_get(p->m.req, p->m.tok, &ns->r);
    assert(ret != 2);
    if (!ret){
272
        b->c1 = 1;
273 274 275
        /* success, dequeue (saving as rc) and send to client */
        qlist_del(front);
        m->i_rc = p->m;
276
        resource_response(&p->m, lp, ret, TOKEN_DUMMY);
277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295
        free(p);
        /* additionally attempt to dequeue next one down */
        tw_event *e = codes_event_new(lp->gid, codes_local_latency(lp), lp);
        resource_msg *m_deq = tw_event_data(e);
        msg_set_header(resource_magic, RESOURCE_DEQ, lp->gid, &m_deq->i.h);
        /* only tok is needed, all others grabbed from q */
        m_deq->i.tok = m->i.tok; 
        tw_event_send(e);
    }
    /* else do nothing */
}

/* bitfield usage:
 * c0 - dequeue+alloc success */ 
static void handle_resource_deq_rc(
        resource_state * ns,
        tw_bf * b,
        resource_msg * m,
        tw_lp * lp){
296
    if (b->c0){
297 298 299
        return;
    }

300
    if (b->c1){
301 302 303 304 305
        /* add operation back to the front of the queue */
        pending_op *op = malloc(sizeof(pending_op));
        op->m = m->i_rc;
        qlist_add(&op->ql, &ns->pending[m->i.tok]);
        resource_response_rc(lp);
Jonathan Jenkins's avatar
Jonathan Jenkins committed
306
        assert(!resource_free(op->m.req, op->m.tok, &ns->r));
307 308 309 310 311 312 313 314 315 316 317 318 319
        /* reverse "deq next" op */
        codes_local_latency_reverse(lp);
    }
}

static void handle_resource_reserve(
        resource_state * ns,
        tw_bf * b,
        resource_msg * m,
        tw_lp * lp){
    resource_token_t tok;
    int ret = resource_reserve(m->i.req, &tok, &ns->r);
    assert(!ret);
320
    resource_response(&m->i, lp, ret, tok);
321 322 323 324 325 326 327 328 329 330 331 332
}
static void handle_resource_reserve_rc(
        resource_state * ns,
        tw_bf * b,
        resource_msg * m,
        tw_lp * lp){
    /* this reversal method is essentially a hack that relies on each
     * sequential reserve appending to the end of the list 
     * - we expect reserves to happen strictly at the beginning of the
     *   simulation */
    ns->r.num_tokens--;
    resource_response_rc(lp);
333 334 335 336 337 338 339
}

void resource_event_handler(
        resource_state * ns,
        tw_bf * b,
        resource_msg * m,
        tw_lp * lp){
340 341
    assert(m->i.h.magic == resource_magic);
    switch(m->i.h.event_type){
342
        case RESOURCE_GET:
343
            handle_resource_get(ns,b,m,lp);
344 345
            break;
        case RESOURCE_FREE:
346
            handle_resource_free(ns,b,m,lp);
347
            break;
348 349
        case RESOURCE_DEQ:
            handle_resource_deq(ns,b,m,lp);
350
            break;
351 352
        case RESOURCE_RESERVE:
            handle_resource_reserve(ns,b,m,lp);
353 354
            break;
        default:
355
            assert(0);
356 357 358 359 360 361 362
    }
}
void resource_rev_handler(
        resource_state * ns,
        tw_bf * b,
        resource_msg * m,
        tw_lp * lp){
363 364
    assert(m->i.h.magic == resource_magic);
    switch(m->i.h.event_type){
365
        case RESOURCE_GET:
366
            handle_resource_get_rc(ns,b,m,lp);
367 368
            break;
        case RESOURCE_FREE:
369
            handle_resource_free_rc(ns,b,m,lp);
370
            break;
371 372
        case RESOURCE_DEQ:
            handle_resource_deq_rc(ns,b,m,lp);
373
            break;
374 375
        case RESOURCE_RESERVE:
            handle_resource_reserve_rc(ns,b,m,lp);
376 377
            break;
        default:
378
            assert(0);
379
    }
380 381 382

    // NOTE: ross doesn't reset b in the case of multiple rollbacks...
    *(int*)b = 0;
383 384 385 386 387 388
}

void resource_finalize(
        resource_state * ns,
        tw_lp * lp){
    /* Fill me in... */
389 390 391 392 393 394
    struct qlist_head *ent;
    qlist_for_each(ent, ns->pending){
        pending_op *op = qlist_entry(ent, pending_op, ql);
        fprintf(stderr, "WARNING: resource LP %lu has a pending allocation\n",
                lp->gid);
    }
395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425
}

/**** END IMPLEMENTATIONS ****/

/**** BEGIN USER-FACING FUNCTIONS ****/
void resource_lp_init(){
    uint32_t h1=0, h2=0;

    bj_hashlittle2("resource", strlen("resource"), &h1, &h2);
    resource_magic = h1+h2;

    lp_type_register("resource", &resource_lp);
}

void resource_lp_configure(){
    long int avail;
    int ret = configuration_get_value_longint(&config, "resource", 
            "available", &avail);
    if (ret){
        fprintf(stderr, "Could not find section:resource value:available for "
                        "resource LP\n");
        exit(1);
    }
    assert(avail > 0);
    avail_global = (uint64_t) avail;
}

static void resource_lp_issue_event(
        msg_header *header,
        uint64_t req,
        resource_token_t tok, /* only used in reserve_get/free */
426
        int block_on_unavail,
427 428 429
        int msg_size,
        int msg_header_offset,
        int msg_callback_offset,
430 431 432
        int msg_callback_misc_size,
        int msg_callback_misc_offset,
        void *msg_callback_misc_data,
433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451
        enum resource_event type,
        tw_lp *sender){

    tw_lpid resource_lpid;

    /* map out the lpid of the resource */
    int mapping_grp_id, mapping_type_id, mapping_rep_id, mapping_offset;
    char lp_type_name[MAX_NAME_LENGTH], lp_group_name[MAX_NAME_LENGTH];
    codes_mapping_get_lp_info(sender->gid, lp_group_name, 
            &mapping_grp_id, &mapping_type_id, lp_type_name, 
            &mapping_rep_id, &mapping_offset);
    codes_mapping_get_lp_id(lp_group_name, "resource", mapping_rep_id, 
            mapping_offset, &resource_lpid); 

    tw_event *e = codes_event_new(resource_lpid, codes_local_latency(sender),
            sender);

    /* set message info */
    resource_msg *m = tw_event_data(e);
452 453 454 455
    msg_set_header(resource_magic, type, sender->gid, &m->i.h);
    m->i.req = req;
    m->i.tok = tok;
    m->i.block_on_unavail = block_on_unavail;
456 457

    /* set callback info */
458
    if (header != NULL){
459
        m->i.h_callback = *header;
460
    }
461 462 463
    m->i.msg_size = msg_size;
    m->i.msg_header_offset = msg_header_offset;
    m->i.msg_callback_offset = msg_callback_offset;
464

465 466 467 468 469 470 471 472 473 474 475 476
    if (msg_callback_misc_size > 0){
        assert(msg_callback_misc_size <= RESOURCE_MAX_CALLBACK_PAYLOAD);
        m->i.msg_callback_misc_size = msg_callback_misc_size;
        m->i.msg_callback_misc_offset = msg_callback_misc_offset;
        memcpy(m->i.msg_callback_misc, msg_callback_misc_data,
                msg_callback_misc_size);
    }
    else{
        m->i.msg_callback_misc_size = 0;
        m->i.msg_callback_misc_offset = 0;
    }

477 478 479 480 481 482
    tw_event_send(e);
}

void resource_lp_get(
        msg_header *header,
        uint64_t req, 
483
        int block_on_unavail,
484 485 486
        int msg_size, 
        int msg_header_offset,
        int msg_callback_offset,
487 488 489
        int msg_callback_misc_size,
        int msg_callback_misc_offset,
        void *msg_callback_misc_data,
490
        tw_lp *sender){
491
    resource_lp_issue_event(header, req, 0, block_on_unavail,
492 493 494
            msg_size, msg_header_offset, msg_callback_offset,
            msg_callback_misc_size, msg_callback_misc_offset,
            msg_callback_misc_data, RESOURCE_GET, sender);
495 496 497
}

/* no callback for frees thus far */
498
void resource_lp_free(uint64_t req, tw_lp *sender){
499
    resource_lp_issue_event(NULL, req, 0, -1, -1,-1,-1, 0, 0, NULL,
500 501 502 503 504
            RESOURCE_FREE, sender);
}
void resource_lp_reserve(
        msg_header *header, 
        uint64_t req,
505
        int block_on_unavail,
506 507 508
        int msg_size,
        int msg_header_offset,
        int msg_callback_offset,
509 510 511
        int msg_callback_misc_size,
        int msg_callback_misc_offset,
        void *msg_callback_misc_data,
512
        tw_lp *sender){
513 514 515 516
    resource_lp_issue_event(header, req, 0, block_on_unavail, msg_size,
            msg_header_offset, msg_callback_offset, msg_callback_misc_size,
            msg_callback_misc_offset, msg_callback_misc_data, RESOURCE_RESERVE,
            sender);
517 518 519 520 521
}
void resource_lp_get_reserved(
        msg_header *header,
        uint64_t req,
        resource_token_t tok,
522
        int block_on_unavail,
523 524 525
        int msg_size, 
        int msg_header_offset,
        int msg_callback_offset,
526 527 528
        int msg_callback_misc_size,
        int msg_callback_misc_offset,
        void *msg_callback_misc_data,
529
        tw_lp *sender){
530 531 532
    resource_lp_issue_event(header, req, tok, block_on_unavail, msg_size,
            msg_header_offset, msg_callback_offset, msg_callback_misc_size,
            msg_callback_misc_offset, msg_callback_misc_data, RESOURCE_GET,
533 534 535 536 537 538
            sender);
}
void resource_lp_free_reserved(
        uint64_t req, 
        resource_token_t tok,
        tw_lp *sender){
539 540
    resource_lp_issue_event(NULL, req, tok, -1,-1,-1,-1, 0,0,NULL,
            RESOURCE_FREE, sender);
541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573
}

/* rc functions - thankfully, they only use codes-local-latency, so no need 
 * to pass in any arguments */

static void resource_lp_issue_event_rc(tw_lp *sender){
    codes_local_latency_reverse(sender);
}

void resource_lp_get_rc(tw_lp *sender){
    resource_lp_issue_event_rc(sender);
}
void resource_lp_free_rc(tw_lp *sender){
    resource_lp_issue_event_rc(sender);
}
void resource_lp_reserve_rc(tw_lp *sender){
    resource_lp_issue_event_rc(sender);
}
void resource_lp_get_reserved_rc(tw_lp *sender){
    resource_lp_issue_event_rc(sender);
}
void resource_lp_free_reserved_rc(tw_lp *sender){
    resource_lp_issue_event_rc(sender);
}

/*
 * Local variables:
 *  c-indent-level: 4
 *  c-basic-offset: 4
 * End:
 *
 * vim: ts=8 sts=4 sw=4 expandtab
 */