Ejemplo n.º 1
0
static void
reply_msacc(void *vmsaccrp)
{
    ErtsMsAcc *msacc = ERTS_MSACC_TSD_GET();
    ErtsMSAccReq *msaccrp = (ErtsMSAccReq *) vmsaccrp;

    ASSERT(!msacc || !msacc->unmanaged);

    if (msaccrp->action == ERTS_MSACC_ENABLE && !msacc) {
        msacc = get_msacc();

        msacc->perf_counter = erts_sys_perf_counter();

        msacc->state = ERTS_MSACC_STATE_OTHER;

        ERTS_MSACC_TSD_SET(msacc);

    } else if (msaccrp->action == ERTS_MSACC_DISABLE && msacc) {
        ERTS_MSACC_TSD_SET(NULL);
    } else if (msaccrp->action == ERTS_MSACC_RESET) {
        msacc = msacc ? msacc : get_msacc();
        erts_msacc_reset(msacc);
    } else if (msaccrp->action == ERTS_MSACC_GATHER && !msacc) {
        msacc = get_msacc();
    }

    ASSERT(!msacc || !msacc->unmanaged);

    send_reply(msacc, msaccrp);

    erts_proc_dec_refc(msaccrp->proc);

    if (erts_smp_atomic32_dec_read_nob(&msaccrp->refc) == 0)
      erts_free(ERTS_ALC_T_MSACC, vmsaccrp);
}
Ejemplo n.º 2
0
Archivo: erl_msacc.c Proyecto: hawk/otp
void erts_msacc_init_thread(char *type, int id, int managed) {
    ErtsMsAcc *msacc;

    msacc = erts_alloc(ERTS_ALC_T_MSACC, sizeof(ErtsMsAcc) +
                       sizeof(ErtsMsAccPerfCntr) * ERTS_MSACC_STATE_COUNT);

    msacc->type = strdup(type);
    msacc->id = make_small(id);
    msacc->unmanaged = !managed;
    msacc->tid = erts_thr_self();
    msacc->perf_counter = 0;

#ifdef USE_THREADS
    erts_rwmtx_rwlock(&msacc_mutex);
    if (!managed) {
        erts_mtx_init(&msacc->mtx,"msacc_unmanaged_mutex");
        msacc->next = msacc_unmanaged;
        msacc_unmanaged = msacc;
        msacc_unmanaged_count++;
        ERTS_MSACC_TSD_SET(msacc);
    } else {
        msacc->next = msacc_managed;
        msacc_managed = msacc;
    }
    erts_rwmtx_rwunlock(&msacc_mutex);
#else
    msacc_managed = msacc;
#endif

    erts_msacc_reset(msacc);

#ifdef ERTS_MSACC_ALWAYS_ON
    ERTS_MSACC_TSD_SET(msacc);
    msacc->perf_counter = erts_sys_perf_counter();
    msacc->state = ERTS_MSACC_STATE_OTHER;
#endif
}
Ejemplo n.º 3
0
/*
 * This function is responsible for enabling, disabling, resetting and
 * gathering data related to microstate accounting.
 *
 * Managed threads and unmanaged threads are handled differently.
 *   - managed threads get a misc_aux job telling them to switch on msacc
 *   - unmanaged have some fields protected by a mutex that has to be taken
 *     before any values can be updated
 *
 * For performance reasons there is also a global value erts_msacc_enabled
 * that controls the state of all threads. Statistics gathering is only on
 * if erts_msacc_enabled && msacc is true.
 */
Eterm
erts_msacc_request(Process *c_p, int action, Eterm *threads)
{
#ifdef ERTS_ENABLE_MSACC
    ErtsMsAcc *msacc =  ERTS_MSACC_TSD_GET();
    ErtsSchedulerData *esdp = erts_proc_sched_data(c_p);
    Eterm ref;
    ErtsMSAccReq *msaccrp;
    Eterm *hp;


#ifdef ERTS_MSACC_ALWAYS_ON
    if (action == ERTS_MSACC_ENABLE || action == ERTS_MSACC_DISABLE)
        return THE_NON_VALUE;
#else
    /* take care of double enable, and double disable here */
    if (msacc && action == ERTS_MSACC_ENABLE) {
        return THE_NON_VALUE;
    } else if (!msacc && action == ERTS_MSACC_DISABLE) {
        return THE_NON_VALUE;
    }
#endif

    ref = erts_make_ref(c_p);

    msaccrp = erts_alloc(ERTS_ALC_T_MSACC, sizeof(ErtsMSAccReq));
    hp = &msaccrp->ref_heap[0];

    msaccrp->action = action;
    msaccrp->proc = c_p;
    msaccrp->ref = STORE_NC(&hp, NULL, ref);
    msaccrp->req_sched = esdp->no;

#ifdef ERTS_SMP
    *threads = erts_no_schedulers;
    *threads += 1; /* aux thread */
#else
    *threads = 1;
#endif

    erts_smp_atomic32_init_nob(&msaccrp->refc,(erts_aint32_t)*threads);

    erts_proc_add_refc(c_p, *threads);

    if (erts_no_schedulers > 1)
	erts_schedule_multi_misc_aux_work(1,
                                          erts_no_schedulers,
                                          reply_msacc,
                                          (void *) msaccrp);
#ifdef ERTS_SMP
    /* aux thread */
    erts_schedule_misc_aux_work(0, reply_msacc, (void *) msaccrp);
#endif

#ifdef USE_THREADS
    /* Manage unmanaged threads */
    switch (action) {
    case ERTS_MSACC_GATHER: {
        Uint unmanaged_count;
        ErtsMsAcc *msacc, **unmanaged;
        int i = 0;

        /* we copy a list of pointers here so that we do not have to have
           the msacc_mutex when sending messages */
        erts_rwmtx_rlock(&msacc_mutex);
        unmanaged_count = msacc_unmanaged_count;
        unmanaged = erts_alloc(ERTS_ALC_T_MSACC,
                               sizeof(ErtsMsAcc*)*unmanaged_count);

        for (i = 0, msacc = msacc_unmanaged;
             i < unmanaged_count;
             i++, msacc = msacc->next) {
            unmanaged[i] = msacc;
        }
        erts_rwmtx_runlock(&msacc_mutex);

        for (i = 0; i < unmanaged_count; i++) {
            erts_mtx_lock(&unmanaged[i]->mtx);
            if (unmanaged[i]->perf_counter) {
                ErtsSysPerfCounter perf_counter;
                /* if enabled update stats */
                perf_counter = erts_sys_perf_counter();
                unmanaged[i]->perf_counters[unmanaged[i]->state] +=
                    perf_counter - unmanaged[i]->perf_counter;
                unmanaged[i]->perf_counter = perf_counter;
            }
            erts_mtx_unlock(&unmanaged[i]->mtx);
            send_reply(unmanaged[i],msaccrp);
        }
        erts_free(ERTS_ALC_T_MSACC,unmanaged);
        /* We have just sent unmanaged_count messages, so bump no of threads */
        *threads += unmanaged_count;
        break;
    }
    case ERTS_MSACC_RESET: {
        ErtsMsAcc *msacc;
        erts_rwmtx_rlock(&msacc_mutex);
        for (msacc = msacc_unmanaged; msacc != NULL; msacc = msacc->next)
            erts_msacc_reset(msacc);
        erts_rwmtx_runlock(&msacc_mutex);
        break;
    }
    case ERTS_MSACC_ENABLE: {
        erts_rwmtx_rlock(&msacc_mutex);
        for (msacc = msacc_unmanaged; msacc != NULL; msacc = msacc->next) {
            erts_mtx_lock(&msacc->mtx);
            msacc->perf_counter = erts_sys_perf_counter();
            /* we assume the unmanaged thread is sleeping */
            msacc->state = ERTS_MSACC_STATE_SLEEP;
            erts_mtx_unlock(&msacc->mtx);
        }
        erts_rwmtx_runlock(&msacc_mutex);
        break;
    }
    case ERTS_MSACC_DISABLE: {
        ErtsSysPerfCounter perf_counter;
        erts_rwmtx_rlock(&msacc_mutex);
        /* make sure to update stats with latest results */
        for (msacc = msacc_unmanaged; msacc != NULL; msacc = msacc->next) {
            erts_mtx_lock(&msacc->mtx);
            perf_counter = erts_sys_perf_counter();
            msacc->perf_counters[msacc->state] += perf_counter - msacc->perf_counter;
            msacc->perf_counter = 0;
            erts_mtx_unlock(&msacc->mtx);
        }
        erts_rwmtx_runlock(&msacc_mutex);
        break;
    }
    default: { ASSERT(0); }
    }

#endif

    *threads = make_small(*threads);

    reply_msacc((void *) msaccrp);

#ifndef ERTS_MSACC_ALWAYS_ON
    /* enable/disable the global value */
    if (action == ERTS_MSACC_ENABLE) {
        erts_msacc_enabled = 1;
    } else if (action == ERTS_MSACC_DISABLE) {
        erts_msacc_enabled = 0;
    }
#endif

    return ref;
#else
    return THE_NON_VALUE;
#endif
}