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erl_process.c
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erl_process.c
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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1996-2011. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
#define ERL_PROCESS_C__
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stddef.h> /* offsetof() */
#include "sys.h"
#include "erl_vm.h"
#include "global.h"
#include "erl_process.h"
#include "erl_nmgc.h"
#include "error.h"
#include "bif.h"
#include "erl_db.h"
#include "dist.h"
#include "beam_catches.h"
#include "erl_instrument.h"
#include "erl_threads.h"
#include "erl_binary.h"
#include "beam_bp.h"
#include "erl_cpu_topology.h"
#define ERTS_RUNQ_CHECK_BALANCE_REDS_PER_SCHED (2000*CONTEXT_REDS)
#define ERTS_RUNQ_CALL_CHECK_BALANCE_REDS \
(ERTS_RUNQ_CHECK_BALANCE_REDS_PER_SCHED/2)
#define ERTS_PROC_MIN_CONTEXT_SWITCH_REDS_COST (CONTEXT_REDS/10)
#define ERTS_SCHED_SPIN_UNTIL_YIELD 100
#define ERTS_SCHED_SYS_SLEEP_SPINCOUNT 10
#define ERTS_SCHED_TSE_SLEEP_SPINCOUNT_FACT 1000
#define ERTS_SCHED_TSE_SLEEP_SPINCOUNT \
(ERTS_SCHED_SYS_SLEEP_SPINCOUNT*ERTS_SCHED_TSE_SLEEP_SPINCOUNT_FACT)
#define ERTS_SCHED_SUSPEND_SLEEP_SPINCOUNT 0
#define ERTS_WAKEUP_OTHER_LIMIT_VERY_HIGH (200*CONTEXT_REDS)
#define ERTS_WAKEUP_OTHER_LIMIT_HIGH (50*CONTEXT_REDS)
#define ERTS_WAKEUP_OTHER_LIMIT_MEDIUM (10*CONTEXT_REDS)
#define ERTS_WAKEUP_OTHER_LIMIT_LOW (CONTEXT_REDS)
#define ERTS_WAKEUP_OTHER_LIMIT_VERY_LOW (CONTEXT_REDS/10)
#define ERTS_WAKEUP_OTHER_DEC 10
#define ERTS_WAKEUP_OTHER_FIXED_INC (CONTEXT_REDS/10)
#if 0 || defined(DEBUG)
#define ERTS_FAKE_SCHED_BIND_PRINT_SORTED_CPU_DATA
#endif
#if defined(DEBUG) && 0
#define HARDDEBUG
#else
#undef HARDDEBUG
#endif
#ifdef HARDDEBUG
#define HARDDEBUG_RUNQS
#endif
#ifdef HIPE
#include "hipe_mode_switch.h" /* for hipe_init_process() */
#include "hipe_signal.h" /* for hipe_thread_signal_init() */
#endif
#ifdef ERTS_ENABLE_LOCK_COUNT
#include "erl_lock_count.h"
#endif
#define MAX_BIT (1 << PRIORITY_MAX)
#define HIGH_BIT (1 << PRIORITY_HIGH)
#define NORMAL_BIT (1 << PRIORITY_NORMAL)
#define LOW_BIT (1 << PRIORITY_LOW)
#define ERTS_MAYBE_SAVE_TERMINATING_PROCESS(P) \
do { \
ERTS_SMP_LC_ASSERT(erts_lc_mtx_is_locked(&proc_tab_mtx)); \
if (saved_term_procs.end) \
save_terminating_process((P)); \
} while (0)
#define ERTS_EMPTY_RUNQ(RQ) \
((RQ)->len == 0 && (RQ)->misc.start == NULL)
extern BeamInstr beam_apply[];
extern BeamInstr beam_exit[];
extern BeamInstr beam_continue_exit[];
static Sint p_last;
static Sint p_next;
static Sint p_serial;
static Uint p_serial_mask;
static Uint p_serial_shift;
int erts_sched_compact_load;
Uint erts_no_schedulers;
Uint erts_max_processes = ERTS_DEFAULT_MAX_PROCESSES;
Uint erts_process_tab_index_mask;
static int wakeup_other_limit;
int erts_sched_thread_suggested_stack_size = -1;
#ifdef ERTS_ENABLE_LOCK_CHECK
ErtsLcPSDLocks erts_psd_required_locks[ERTS_PSD_SIZE];
#endif
#ifdef ERTS_SMP
int erts_disable_proc_not_running_opt;
#define ERTS_SCHDLR_SSPND_CHNG_WAITER (((erts_aint32_t) 1) << 0)
#define ERTS_SCHDLR_SSPND_CHNG_MSB (((erts_aint32_t) 1) << 1)
#define ERTS_SCHDLR_SSPND_CHNG_ONLN (((erts_aint32_t) 1) << 2)
#ifndef DEBUG
#define ERTS_SCHDLR_SSPND_CHNG_SET(VAL, OLD_VAL) \
erts_smp_atomic32_set(&schdlr_sspnd.changing, (VAL))
#else
#define ERTS_SCHDLR_SSPND_CHNG_SET(VAL, OLD_VAL) \
do { \
erts_aint32_t old_val__; \
old_val__ = erts_smp_atomic32_xchg(&schdlr_sspnd.changing, \
(VAL)); \
ASSERT(old_val__ == (OLD_VAL)); \
} while (0)
#endif
static struct {
erts_smp_mtx_t mtx;
erts_smp_cnd_t cnd;
int online;
int curr_online;
int wait_curr_online;
erts_smp_atomic32_t changing;
erts_smp_atomic32_t active;
struct {
erts_smp_atomic32_t ongoing;
long wait_active;
ErtsProcList *procs;
} msb; /* Multi Scheduling Block */
} schdlr_sspnd;
static struct {
erts_smp_mtx_t update_mtx;
erts_smp_atomic32_t no_runqs;
int last_active_runqs;
int forced_check_balance;
erts_smp_atomic32_t checking_balance;
int halftime;
int full_reds_history_index;
struct {
int active_runqs;
int reds;
int max_len;
} prev_rise;
Uint n;
} balance_info;
#define ERTS_BLNCE_SAVE_RISE(ACTIVE, MAX_LEN, REDS) \
do { \
balance_info.prev_rise.active_runqs = (ACTIVE); \
balance_info.prev_rise.max_len = (MAX_LEN); \
balance_info.prev_rise.reds = (REDS); \
} while (0)
#endif
erts_sched_stat_t erts_sched_stat;
ErtsRunQueue *erts_common_run_queue;
#ifdef USE_THREADS
static erts_tsd_key_t sched_data_key;
#endif
static erts_smp_mtx_t proc_tab_mtx;
static erts_smp_atomic32_t function_calls;
#ifdef ERTS_SMP
static erts_smp_atomic32_t doing_sys_schedule;
static erts_smp_atomic32_t no_empty_run_queues;
#else /* !ERTS_SMP */
ErtsSchedulerData *erts_scheduler_data;
#endif
ErtsAlignedRunQueue *erts_aligned_run_queues;
Uint erts_no_run_queues;
ErtsAlignedSchedulerData *erts_aligned_scheduler_data;
#ifdef ERTS_SMP
typedef union {
ErtsSchedulerSleepInfo ssi;
char align[ERTS_ALC_CACHE_LINE_ALIGN_SIZE(sizeof(ErtsSchedulerSleepInfo))];
} ErtsAlignedSchedulerSleepInfo;
static ErtsAlignedSchedulerSleepInfo *aligned_sched_sleep_info;
#endif
#ifndef BM_COUNTERS
static int processes_busy;
#endif
Process** process_tab;
static Uint last_reductions;
static Uint last_exact_reductions;
Uint erts_default_process_flags;
Eterm erts_system_monitor;
Eterm erts_system_monitor_msg_queue_len;
Eterm erts_system_monitor_long_gc;
Eterm erts_system_monitor_large_heap;
struct erts_system_monitor_flags_t erts_system_monitor_flags;
/* system performance monitor */
Eterm erts_system_profile;
struct erts_system_profile_flags_t erts_system_profile_flags;
#ifdef HYBRID
Uint erts_num_active_procs;
Process** erts_active_procs;
#endif
#if ERTS_MAX_PROCESSES > 0x7fffffff
#error "Need to store process_count in another type"
#endif
static erts_smp_atomic32_t process_count;
typedef struct ErtsTermProcElement_ ErtsTermProcElement;
struct ErtsTermProcElement_ {
ErtsTermProcElement *next;
ErtsTermProcElement *prev;
int ix;
union {
struct {
Eterm pid;
SysTimeval spawned;
SysTimeval exited;
} process;
struct {
SysTimeval time;
} bif_invocation;
} u;
};
static struct {
ErtsTermProcElement *start;
ErtsTermProcElement *end;
} saved_term_procs;
ERTS_SCHED_PREF_QUICK_ALLOC_IMPL(misc_op_list,
ErtsMiscOpList,
10,
ERTS_ALC_T_MISC_OP_LIST)
ERTS_SCHED_PREF_QUICK_ALLOC_IMPL(proclist,
ErtsProcList,
200,
ERTS_ALC_T_PROC_LIST)
#define ERTS_SCHED_SLEEP_INFO_IX(IX) \
(ASSERT_EXPR(0 <= (IX) && (IX) < erts_no_schedulers), \
&aligned_sched_sleep_info[(IX)].ssi)
#define ERTS_FOREACH_RUNQ(RQVAR, DO) \
do { \
ErtsRunQueue *RQVAR; \
int ix__; \
for (ix__ = 0; ix__ < erts_no_run_queues; ix__++) { \
RQVAR = ERTS_RUNQ_IX(ix__); \
erts_smp_runq_lock(RQVAR); \
{ DO; } \
erts_smp_runq_unlock(RQVAR); \
} \
} while (0)
#define ERTS_FOREACH_OP_RUNQ(RQVAR, DO) \
do { \
ErtsRunQueue *RQVAR; \
int ix__; \
ERTS_SMP_LC_ASSERT(erts_smp_lc_mtx_is_locked(&schdlr_sspnd.mtx)); \
for (ix__ = 0; ix__ < schdlr_sspnd.online; ix__++) { \
RQVAR = ERTS_RUNQ_IX(ix__); \
erts_smp_runq_lock(RQVAR); \
{ DO; } \
erts_smp_runq_unlock(RQVAR); \
} \
} while (0)
#define ERTS_ATOMIC_FOREACH_RUNQ_X(RQVAR, DO, DOX) \
do { \
ErtsRunQueue *RQVAR; \
int ix__; \
for (ix__ = 0; ix__ < erts_no_run_queues; ix__++) { \
RQVAR = ERTS_RUNQ_IX(ix__); \
erts_smp_runq_lock(RQVAR); \
{ DO; } \
} \
{ DOX; } \
for (ix__ = 0; ix__ < erts_no_run_queues; ix__++) \
erts_smp_runq_unlock(ERTS_RUNQ_IX(ix__)); \
} while (0)
#define ERTS_ATOMIC_FOREACH_RUNQ(RQVAR, DO) \
ERTS_ATOMIC_FOREACH_RUNQ_X(RQVAR, DO, )
/*
* Local functions.
*/
static void init_processes_bif(void);
static void save_terminating_process(Process *p);
static void exec_misc_ops(ErtsRunQueue *);
static void print_function_from_pc(int to, void *to_arg, BeamInstr* x);
static int stack_element_dump(int to, void *to_arg, Process* p, Eterm* sp,
int yreg);
#ifdef ERTS_SMP
static void handle_pending_exiters(ErtsProcList *);
#endif
#if defined(ERTS_SMP) && defined(ERTS_ENABLE_LOCK_CHECK)
int
erts_smp_lc_runq_is_locked(ErtsRunQueue *runq)
{
return erts_smp_lc_mtx_is_locked(&runq->mtx);
}
#endif
void
erts_pre_init_process(void)
{
#ifdef USE_THREADS
erts_tsd_key_create(&sched_data_key);
#endif
#ifdef ERTS_ENABLE_LOCK_CHECK
{
int ix;
erts_psd_required_locks[ERTS_PSD_ERROR_HANDLER].get_locks
= ERTS_PSD_ERROR_HANDLER_BUF_GET_LOCKS;
erts_psd_required_locks[ERTS_PSD_ERROR_HANDLER].set_locks
= ERTS_PSD_ERROR_HANDLER_BUF_SET_LOCKS;
erts_psd_required_locks[ERTS_PSD_SAVED_CALLS_BUF].get_locks
= ERTS_PSD_SAVED_CALLS_BUF_GET_LOCKS;
erts_psd_required_locks[ERTS_PSD_SAVED_CALLS_BUF].set_locks
= ERTS_PSD_SAVED_CALLS_BUF_SET_LOCKS;
erts_psd_required_locks[ERTS_PSD_SCHED_ID].get_locks
= ERTS_PSD_SCHED_ID_GET_LOCKS;
erts_psd_required_locks[ERTS_PSD_SCHED_ID].set_locks
= ERTS_PSD_SCHED_ID_SET_LOCKS;
erts_psd_required_locks[ERTS_PSD_DIST_ENTRY].get_locks
= ERTS_PSD_DIST_ENTRY_GET_LOCKS;
erts_psd_required_locks[ERTS_PSD_DIST_ENTRY].set_locks
= ERTS_PSD_DIST_ENTRY_SET_LOCKS;
erts_psd_required_locks[ERTS_PSD_CALL_TIME_BP].get_locks
= ERTS_PSD_CALL_TIME_BP_GET_LOCKS;
erts_psd_required_locks[ERTS_PSD_CALL_TIME_BP].set_locks
= ERTS_PSD_CALL_TIME_BP_SET_LOCKS;
/* Check that we have locks for all entries */
for (ix = 0; ix < ERTS_PSD_SIZE; ix++) {
ERTS_SMP_LC_ASSERT(erts_psd_required_locks[ix].get_locks);
ERTS_SMP_LC_ASSERT(erts_psd_required_locks[ix].set_locks);
}
}
#endif
}
/* initialize the scheduler */
void
erts_init_process(int ncpu)
{
Uint proc_bits = ERTS_PROC_BITS;
#ifdef ERTS_SMP
erts_disable_proc_not_running_opt = 0;
erts_init_proc_lock(ncpu);
#endif
init_proclist_alloc();
erts_smp_atomic32_init(&process_count, 0);
if (erts_use_r9_pids_ports) {
proc_bits = ERTS_R9_PROC_BITS;
ASSERT(erts_max_processes <= (1 << ERTS_R9_PROC_BITS));
}
process_tab = (Process**) erts_alloc(ERTS_ALC_T_PROC_TABLE,
erts_max_processes*sizeof(Process*));
sys_memzero(process_tab, erts_max_processes * sizeof(Process*));
#ifdef HYBRID
erts_active_procs = (Process**)
erts_alloc(ERTS_ALC_T_ACTIVE_PROCS,
erts_max_processes * sizeof(Process*));
erts_num_active_procs = 0;
#endif
erts_smp_mtx_init(&proc_tab_mtx, "proc_tab");
p_last = -1;
p_next = 0;
p_serial = 0;
p_serial_shift = erts_fit_in_bits(erts_max_processes - 1);
p_serial_mask = ((~(~((Uint) 0) << proc_bits)) >> p_serial_shift);
erts_process_tab_index_mask = ~(~((Uint) 0) << p_serial_shift);
#ifndef BM_COUNTERS
processes_busy = 0;
#endif
last_reductions = 0;
last_exact_reductions = 0;
erts_default_process_flags = 0;
}
void
erts_late_init_process(void)
{
int ix;
init_processes_bif();
erts_smp_spinlock_init(&erts_sched_stat.lock, "sched_stat");
for (ix = 0; ix < ERTS_NO_PRIO_LEVELS; ix++) {
Eterm atom;
char *atom_str;
switch (ix) {
case PRIORITY_MAX:
atom_str = "process_max";
break;
case PRIORITY_HIGH:
atom_str = "process_high";
break;
case PRIORITY_NORMAL:
atom_str = "process_normal";
break;
case PRIORITY_LOW:
atom_str = "process_low";
break;
case ERTS_PORT_PRIO_LEVEL:
atom_str = "port";
break;
default:
atom_str = "bad_prio";
ASSERT(!"bad prio");
break;
}
atom = am_atom_put(atom_str, sys_strlen(atom_str));
erts_sched_stat.prio[ix].name = atom;
erts_sched_stat.prio[ix].total_executed = 0;
erts_sched_stat.prio[ix].executed = 0;
erts_sched_stat.prio[ix].total_migrated = 0;
erts_sched_stat.prio[ix].migrated = 0;
}
}
static ERTS_INLINE ErtsProcList *
proclist_create(Process *p)
{
ErtsProcList *plp = proclist_alloc();
plp->pid = p->id;
plp->started = p->started;
return plp;
}
static ERTS_INLINE void
proclist_destroy(ErtsProcList *plp)
{
proclist_free(plp);
}
static ERTS_INLINE int
proclist_same(ErtsProcList *plp, Process *p)
{
return (plp->pid == p->id
&& erts_cmp_timeval(&plp->started, &p->started) == 0);
}
ErtsProcList *
erts_proclist_create(Process *p)
{
return proclist_create(p);
}
void
erts_proclist_destroy(ErtsProcList *plp)
{
proclist_destroy(plp);
}
int
erts_proclist_same(ErtsProcList *plp, Process *p)
{
return proclist_same(plp, p);
}
void *
erts_psd_set_init(Process *p, ErtsProcLocks plocks, int ix, void *data)
{
void *old;
ErtsProcLocks xplocks;
int refc = 0;
ErtsPSD *psd = erts_alloc(ERTS_ALC_T_PSD, sizeof(ErtsPSD));
int i;
for (i = 0; i < ERTS_PSD_SIZE; i++)
psd->data[i] = NULL;
ERTS_SMP_LC_ASSERT(plocks);
ERTS_SMP_LC_ASSERT(plocks == erts_proc_lc_my_proc_locks(p));
xplocks = ERTS_PROC_LOCKS_ALL;
xplocks &= ~plocks;
if (xplocks && erts_smp_proc_trylock(p, xplocks) == EBUSY) {
if (xplocks & ERTS_PROC_LOCK_MAIN) {
erts_smp_proc_inc_refc(p);
erts_smp_proc_unlock(p, plocks);
erts_smp_proc_lock(p, ERTS_PROC_LOCKS_ALL);
refc = 1;
}
else {
if (plocks & ERTS_PROC_LOCKS_ALL_MINOR)
erts_smp_proc_unlock(p, plocks & ERTS_PROC_LOCKS_ALL_MINOR);
erts_smp_proc_lock(p, ERTS_PROC_LOCKS_ALL_MINOR);
}
}
if (!p->psd)
p->psd = psd;
if (xplocks)
erts_smp_proc_unlock(p, xplocks);
if (refc)
erts_smp_proc_dec_refc(p);
ASSERT(p->psd);
if (p->psd != psd)
erts_free(ERTS_ALC_T_PSD, psd);
old = p->psd->data[ix];
p->psd->data[ix] = data;
ERTS_SMP_LC_ASSERT(plocks == erts_proc_lc_my_proc_locks(p));
return old;
}
#ifdef ERTS_SMP
void
erts_sched_finish_poke(ErtsSchedulerSleepInfo *ssi, erts_aint32_t flags)
{
switch (flags & ERTS_SSI_FLGS_SLEEP_TYPE) {
case ERTS_SSI_FLG_POLL_SLEEPING:
erts_sys_schedule_interrupt(1);
break;
case ERTS_SSI_FLG_TSE_SLEEPING:
erts_tse_set(ssi->event);
break;
case 0:
break;
default:
erl_exit(ERTS_ABORT_EXIT, "%s:%d: Internal error\n",
__FILE__, __LINE__);
break;
}
}
typedef struct erts_misc_aux_work_t_ erts_misc_aux_work_t;
struct erts_misc_aux_work_t_ {
erts_misc_aux_work_t *next;
void (*func)(void *);
void *arg;
};
typedef struct {
erts_smp_mtx_t mtx;
erts_misc_aux_work_t *first;
erts_misc_aux_work_t *last;
} erts_misc_aux_work_q_t;
typedef union {
erts_misc_aux_work_q_t data;
char align[ERTS_ALC_CACHE_LINE_ALIGN_SIZE(sizeof(erts_misc_aux_work_q_t))];
} erts_algnd_misc_aux_work_q_t;
static erts_algnd_misc_aux_work_q_t *misc_aux_work_queues;
ERTS_SCHED_PREF_QUICK_ALLOC_IMPL(misc_aux_work,
erts_misc_aux_work_t,
200,
ERTS_ALC_T_MISC_AUX_WORK)
static void
init_misc_aux_work(void)
{
int ix;
init_misc_aux_work_alloc();
misc_aux_work_queues =
erts_alloc_permanent_cache_aligned(ERTS_ALC_T_MISC_AUX_WORK_Q,
erts_no_schedulers *
sizeof(erts_algnd_misc_aux_work_q_t));
for (ix = 0; ix < erts_no_schedulers; ix++) {
erts_smp_mtx_init_x(&misc_aux_work_queues[ix].data.mtx,
"misc_aux_work_queue",
make_small(ix + 1));
misc_aux_work_queues[ix].data.first = NULL;
misc_aux_work_queues[ix].data.last = NULL;
}
}
static void
handle_misc_aux_work(ErtsSchedulerData *esdp)
{
int ix = (int) esdp->no - 1;
erts_misc_aux_work_t *mawp;
erts_smp_mtx_lock(&misc_aux_work_queues[ix].data.mtx);
mawp = misc_aux_work_queues[ix].data.first;
misc_aux_work_queues[ix].data.first = NULL;
misc_aux_work_queues[ix].data.last = NULL;
erts_smp_mtx_unlock(&misc_aux_work_queues[ix].data.mtx);
while (mawp) {
erts_misc_aux_work_t *free_mawp;
mawp->func(mawp->arg);
free_mawp = mawp;
mawp = mawp->next;
misc_aux_work_free(free_mawp);
}
}
void
erts_smp_schedule_misc_aux_work(int ignore_self,
int max_sched,
void (*func)(void *),
void *arg)
{
int ix, ignore_ix = -1;
if (ignore_self) {
ErtsSchedulerData *esdp = erts_get_scheduler_data();
if (esdp)
ignore_ix = (int) esdp->no - 1;
}
ASSERT(0 <= max_sched && max_sched <= erts_no_schedulers);
for (ix = 0; ix < max_sched; ix++) {
erts_aint32_t aux_work;
erts_misc_aux_work_t *mawp;
ErtsSchedulerSleepInfo *ssi;
if (ix == ignore_ix)
continue;
mawp = misc_aux_work_alloc();
mawp->func = func;
mawp->arg = arg;
mawp->next = NULL;
erts_smp_mtx_lock(&misc_aux_work_queues[ix].data.mtx);
if (!misc_aux_work_queues[ix].data.last)
misc_aux_work_queues[ix].data.first = mawp;
else
misc_aux_work_queues[ix].data.last->next = mawp;
misc_aux_work_queues[ix].data.last = mawp;
erts_smp_mtx_unlock(&misc_aux_work_queues[ix].data.mtx);
ssi = ERTS_SCHED_SLEEP_INFO_IX(ix);
aux_work = erts_smp_atomic32_bor(&ssi->aux_work,
ERTS_SSI_AUX_WORK_MISC);
if ((aux_work & ERTS_SSI_AUX_WORK_MISC) == 0)
erts_sched_poke(ssi);
}
}
#ifdef ERTS_SMP_SCHEDULERS_NEED_TO_CHECK_CHILDREN
void
erts_smp_notify_check_children_needed(void)
{
int i;
for (i = 0; i < erts_no_schedulers; i++) {
erts_aint32_t aux_work;
ErtsSchedulerSleepInfo *ssi;
ssi = ERTS_SCHED_SLEEP_INFO_IX(i);
aux_work = erts_smp_atomic32_bor(&ssi->aux_work,
ERTS_SSI_AUX_WORK_CHECK_CHILDREN);
if (!(aux_work & ERTS_SSI_AUX_WORK_CHECK_CHILDREN))
erts_sched_poke(ssi);
}
}
#endif
#ifdef ERTS_SCHED_NEED_BLOCKABLE_AUX_WORK
static ERTS_INLINE erts_aint32_t
blockable_aux_work(ErtsSchedulerData *esdp,
ErtsSchedulerSleepInfo *ssi,
erts_aint32_t aux_work)
{
if (aux_work & ERTS_SSI_BLOCKABLE_AUX_WORK_MASK) {
if (aux_work & ERTS_SSI_AUX_WORK_MISC) {
aux_work = erts_smp_atomic32_band(&ssi->aux_work,
~ERTS_SSI_AUX_WORK_MISC);
aux_work &= ~ERTS_SSI_AUX_WORK_MISC;
handle_misc_aux_work(esdp);
}
#ifdef ERTS_SMP_SCHEDULERS_NEED_TO_CHECK_CHILDREN
if (aux_work & ERTS_SSI_AUX_WORK_CHECK_CHILDREN) {
aux_work = erts_smp_atomic32_band(&ssi->aux_work,
~ERTS_SSI_AUX_WORK_CHECK_CHILDREN);
aux_work &= ~ERTS_SSI_AUX_WORK_CHECK_CHILDREN;
erts_check_children();
}
#endif
}
return aux_work;
}
#endif
#ifdef ERTS_SCHED_NEED_NONBLOCKABLE_AUX_WORK
static ERTS_INLINE erts_aint32_t
nonblockable_aux_work(ErtsSchedulerData *esdp,
ErtsSchedulerSleepInfo *ssi,
erts_aint32_t aux_work)
{
if (aux_work & ERTS_SSI_NONBLOCKABLE_AUX_WORK_MASK) {
}
}
#endif
static void
prepare_for_block(void *vrq)
{
erts_smp_runq_unlock((ErtsRunQueue *) vrq);
}
static void
resume_after_block(void *vrq)
{
erts_smp_runq_lock((ErtsRunQueue *) vrq);
}
#endif
static ERTS_INLINE void
sched_waiting_sys(Uint no, ErtsRunQueue *rq)
{
ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq));
ASSERT(rq->waiting >= 0);
rq->flags |= (ERTS_RUNQ_FLG_OUT_OF_WORK
| ERTS_RUNQ_FLG_HALFTIME_OUT_OF_WORK);
rq->waiting++;
rq->waiting *= -1;
rq->woken = 0;
if (erts_system_profile_flags.scheduler)
profile_scheduler(make_small(no), am_inactive);
}
static ERTS_INLINE void
sched_active_sys(Uint no, ErtsRunQueue *rq)
{
ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq));
ASSERT(rq->waiting < 0);
rq->waiting *= -1;
rq->waiting--;
if (erts_system_profile_flags.scheduler)
profile_scheduler(make_small(no), am_active);
}
Uint
erts_active_schedulers(void)
{
/* RRRRRRRRR */
Uint as = erts_no_schedulers;
ERTS_ATOMIC_FOREACH_RUNQ(rq, as -= abs(rq->waiting));
ASSERT(as >= 0);
return as;
}
#ifdef ERTS_SMP
static ERTS_INLINE void
clear_sys_scheduling(void)
{
erts_smp_atomic32_set_relb(&doing_sys_schedule, 0);
}
static ERTS_INLINE int
try_set_sys_scheduling(void)
{
return 0 == erts_smp_atomic32_cmpxchg_acqb(&doing_sys_schedule, 1, 0);
}
#endif
static ERTS_INLINE int
prepare_for_sys_schedule(void)
{
#ifdef ERTS_SMP
while (!erts_port_task_have_outstanding_io_tasks()
&& try_set_sys_scheduling()) {
if (!erts_port_task_have_outstanding_io_tasks())
return 1;
clear_sys_scheduling();
}
return 0;
#else
return !erts_port_task_have_outstanding_io_tasks();
#endif
}
#ifdef ERTS_SMP
static ERTS_INLINE void
sched_change_waiting_sys_to_waiting(Uint no, ErtsRunQueue *rq)
{
ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq));
ASSERT(rq->waiting < 0);
rq->waiting *= -1;
}
static ERTS_INLINE void
sched_waiting(Uint no, ErtsRunQueue *rq)
{
ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq));
rq->flags |= (ERTS_RUNQ_FLG_OUT_OF_WORK
| ERTS_RUNQ_FLG_HALFTIME_OUT_OF_WORK);
if (rq->waiting < 0)
rq->waiting--;
else
rq->waiting++;
rq->woken = 0;
if (erts_system_profile_flags.scheduler)
profile_scheduler(make_small(no), am_inactive);
}
static ERTS_INLINE void
sched_active(Uint no, ErtsRunQueue *rq)
{
ERTS_SMP_LC_ASSERT(erts_smp_lc_runq_is_locked(rq));
if (rq->waiting < 0)
rq->waiting++;
else
rq->waiting--;
if (erts_system_profile_flags.scheduler)
profile_scheduler(make_small(no), am_active);
}
static int ERTS_INLINE
ongoing_multi_scheduling_block(void)
{
return erts_smp_atomic32_read(&schdlr_sspnd.msb.ongoing) != 0;
}
static ERTS_INLINE void
empty_runq(ErtsRunQueue *rq)
{
erts_aint32_t oifls = erts_smp_atomic32_band(&rq->info_flags,
~ERTS_RUNQ_IFLG_NONEMPTY);
if (oifls & ERTS_RUNQ_IFLG_NONEMPTY) {
#ifdef DEBUG
erts_aint32_t empty = erts_smp_atomic32_read(&no_empty_run_queues);
/*
* For a short period of time no_empty_run_queues may have
* been increased twice for a specific run queue.
*/
ASSERT(0 <= empty && empty < 2*erts_no_run_queues);
#endif
erts_smp_atomic32_inc(&no_empty_run_queues);
}
}
static ERTS_INLINE void
non_empty_runq(ErtsRunQueue *rq)
{
erts_aint32_t oifls = erts_smp_atomic32_bor(&rq->info_flags,
ERTS_RUNQ_IFLG_NONEMPTY);
if (!(oifls & ERTS_RUNQ_IFLG_NONEMPTY)) {
#ifdef DEBUG
erts_aint32_t empty = erts_smp_atomic32_read(&no_empty_run_queues);
/*
* For a short period of time no_empty_run_queues may have
* been increased twice for a specific run queue.
*/
ASSERT(0 < empty && empty <= 2*erts_no_run_queues);
#endif
erts_smp_atomic32_dec(&no_empty_run_queues);
}
}
static erts_aint32_t
sched_prep_spin_wait(ErtsSchedulerSleepInfo *ssi)
{
erts_aint32_t oflgs;
erts_aint32_t nflgs = (ERTS_SSI_FLG_SLEEPING
| ERTS_SSI_FLG_WAITING);
erts_aint32_t xflgs = 0;
do {
oflgs = erts_smp_atomic32_cmpxchg(&ssi->flags, nflgs, xflgs);
if (oflgs == xflgs)
return nflgs;
xflgs = oflgs;
} while (!(oflgs & ERTS_SSI_FLG_SUSPENDED));
return oflgs;
}
static erts_aint32_t
sched_prep_cont_spin_wait(ErtsSchedulerSleepInfo *ssi)
{
erts_aint32_t oflgs;
erts_aint32_t nflgs = (ERTS_SSI_FLG_SLEEPING
| ERTS_SSI_FLG_WAITING);
erts_aint32_t xflgs = ERTS_SSI_FLG_WAITING;
do {
oflgs = erts_smp_atomic32_cmpxchg(&ssi->flags, nflgs, xflgs);
if (oflgs == xflgs)
return nflgs;
xflgs = oflgs;
nflgs |= oflgs & ERTS_SSI_FLG_SUSPENDED;
} while (oflgs & ERTS_SSI_FLG_WAITING);
return oflgs;
}
static erts_aint32_t
sched_spin_wait(ErtsSchedulerSleepInfo *ssi, int spincount)
{
int until_yield = ERTS_SCHED_SPIN_UNTIL_YIELD;
int sc = spincount;
erts_aint32_t flgs;
do {
flgs = erts_smp_atomic32_read_acqb(&ssi->flags);
if ((flgs & (ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING))
!= (ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING)) {
break;
}
ERTS_SPIN_BODY;
if (--until_yield == 0) {
until_yield = ERTS_SCHED_SPIN_UNTIL_YIELD;
erts_thr_yield();
}
} while (--sc > 0);
return flgs;
}
static erts_aint32_t
sched_set_sleeptype(ErtsSchedulerSleepInfo *ssi, erts_aint32_t sleep_type)
{
erts_aint32_t oflgs;
erts_aint32_t nflgs = ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING|sleep_type;
erts_aint32_t xflgs = ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING;
if (sleep_type == ERTS_SSI_FLG_TSE_SLEEPING)
erts_tse_reset(ssi->event);
while (1) {
oflgs = erts_smp_atomic32_cmpxchg(&ssi->flags, nflgs, xflgs);
if (oflgs == xflgs)
return nflgs;
if ((oflgs & (ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING))
!= (ERTS_SSI_FLG_SLEEPING|ERTS_SSI_FLG_WAITING)) {
return oflgs;
}
xflgs = oflgs;