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Diffstat (limited to 'erts/emulator/beam/erl_process.c')
-rw-r--r--erts/emulator/beam/erl_process.c329
1 files changed, 285 insertions, 44 deletions
diff --git a/erts/emulator/beam/erl_process.c b/erts/emulator/beam/erl_process.c
index 95d408f79d..09ca536188 100644
--- a/erts/emulator/beam/erl_process.c
+++ b/erts/emulator/beam/erl_process.c
@@ -52,21 +52,22 @@
#define ERTS_SCHED_SPIN_UNTIL_YIELD 100
-#define ERTS_SCHED_SYS_SLEEP_SPINCOUNT 10
+#define ERTS_SCHED_SYS_SLEEP_SPINCOUNT_VERY_LONG 40
+#define ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_VERY_LONG 1000
+#define ERTS_SCHED_SYS_SLEEP_SPINCOUNT_LONG 20
+#define ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_LONG 1000
+#define ERTS_SCHED_SYS_SLEEP_SPINCOUNT_MEDIUM 10
+#define ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_MEDIUM 1000
+#define ERTS_SCHED_SYS_SLEEP_SPINCOUNT_SHORT 10
+#define ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_SHORT 0
+#define ERTS_SCHED_SYS_SLEEP_SPINCOUNT_VERY_SHORT 5
+#define ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_VERY_SHORT 0
+#define ERTS_SCHED_SYS_SLEEP_SPINCOUNT_NONE 0
+#define ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_NONE 0
+
#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
@@ -123,14 +124,18 @@ 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
+static struct {
+ int aux_work;
+ int tse;
+ int sys_schedule;
+} sched_busy_wait;
+
#ifdef ERTS_SMP
int erts_disable_proc_not_running_opt;
@@ -2046,7 +2051,7 @@ scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq)
erts_smp_runq_unlock(rq);
- spincount = ERTS_SCHED_TSE_SLEEP_SPINCOUNT;
+ spincount = sched_busy_wait.tse;
tse_wait:
@@ -2097,7 +2102,7 @@ scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq)
}
flgs = sched_prep_cont_spin_wait(ssi);
- spincount = ERTS_SCHED_TSE_SLEEP_SPINCOUNT;
+ spincount = sched_busy_wait.aux_work;
if (!(flgs & ERTS_SSI_FLG_WAITING)) {
ASSERT(!(flgs & ERTS_SSI_FLG_SLEEPING));
@@ -2134,7 +2139,9 @@ scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq)
ASSERT(working);
sched_wall_time_change(esdp, working = 0);
- spincount = ERTS_SCHED_SYS_SLEEP_SPINCOUNT;
+ spincount = sched_busy_wait.sys_schedule;
+ if (spincount == 0)
+ goto sys_aux_work;
while (spincount-- > 0) {
@@ -3560,31 +3567,280 @@ erts_debug_nbalance(void)
#endif
}
+/* Wakeup other schedulers */
+
+typedef enum {
+ ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_VERY_HIGH,
+ ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_HIGH,
+ ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_MEDIUM,
+ ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_LOW,
+ ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_VERY_LOW
+} ErtsSchedWakeupOtherThreshold;
+
+typedef enum {
+ ERTS_SCHED_WAKEUP_OTHER_TYPE_PROPOSAL,
+ ERTS_SCHED_WAKEUP_OTHER_TYPE_LEGACY
+} ErtsSchedWakeupOtherType;
+
+/* First proposal */
+
+#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_SHIFT_VERY_HIGH 3
+#define ERTS_WAKEUP_OTHER_DEC_SHIFT_HIGH 1
+#define ERTS_WAKEUP_OTHER_DEC_SHIFT_MEDIUM 0
+#define ERTS_WAKEUP_OTHER_DEC_SHIFT_LOW -2
+#define ERTS_WAKEUP_OTHER_DEC_SHIFT_VERY_LOW -5
+
+#define ERTS_WAKEUP_OTHER_DEC_SHIFT 2
+#define ERTS_WAKEUP_OTHER_FIXED_INC (CONTEXT_REDS/10)
+
+/* To be legacy */
+
+#define ERTS_WAKEUP_OTHER_LIMIT_VERY_HIGH_LEGACY (200*CONTEXT_REDS)
+#define ERTS_WAKEUP_OTHER_LIMIT_HIGH_LEGACY (50*CONTEXT_REDS)
+#define ERTS_WAKEUP_OTHER_LIMIT_MEDIUM_LEGACY (10*CONTEXT_REDS)
+#define ERTS_WAKEUP_OTHER_LIMIT_LOW_LEGACY (CONTEXT_REDS)
+#define ERTS_WAKEUP_OTHER_LIMIT_VERY_LOW_LEGACY (CONTEXT_REDS/10)
+
+#define ERTS_WAKEUP_OTHER_DEC_LEGACY 10
+#define ERTS_WAKEUP_OTHER_FIXED_INC_LEGACY (CONTEXT_REDS/10)
+
+#ifdef ERTS_SMP
+
+static struct {
+ ErtsSchedWakeupOtherThreshold threshold;
+ ErtsSchedWakeupOtherType type;
+ int limit;
+ int dec_shift;
+ int dec_mask;
+ void (*check)(ErtsRunQueue *rq);
+} wakeup_other;
+
+static void
+wakeup_other_check(ErtsRunQueue *rq)
+{
+ int wo_reds = rq->wakeup_other_reds;
+ if (wo_reds) {
+ int left_len = rq->len - 1;
+ if (left_len < 1) {
+ int wo_reduce = wo_reds << wakeup_other.dec_shift;
+ wo_reduce &= wakeup_other.dec_mask;
+ rq->wakeup_other -= wo_reduce;
+ if (rq->wakeup_other < 0)
+ rq->wakeup_other = 0;
+ }
+ else {
+ rq->wakeup_other += (left_len*wo_reds
+ + ERTS_WAKEUP_OTHER_FIXED_INC);
+ if (rq->wakeup_other > wakeup_other.limit) {
+ int empty_rqs =
+ erts_smp_atomic32_read_acqb(&no_empty_run_queues);
+ if (empty_rqs != 0)
+ wake_scheduler_on_empty_runq(rq);
+ rq->wakeup_other = 0;
+ }
+ }
+ rq->wakeup_other_reds = 0;
+ }
+}
+
+static void
+wakeup_other_set_limit(void)
+{
+ switch (wakeup_other.threshold) {
+ case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_VERY_HIGH:
+ wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_VERY_HIGH;
+ wakeup_other.dec_shift = ERTS_WAKEUP_OTHER_DEC_SHIFT_VERY_HIGH;
+ break;
+ case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_HIGH:
+ wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_HIGH;
+ wakeup_other.dec_shift = ERTS_WAKEUP_OTHER_DEC_SHIFT_HIGH;
+ break;
+ case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_MEDIUM:
+ wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_MEDIUM;
+ wakeup_other.dec_shift = ERTS_WAKEUP_OTHER_DEC_SHIFT_MEDIUM;
+ break;
+ case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_LOW:
+ wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_LOW;
+ wakeup_other.dec_shift = ERTS_WAKEUP_OTHER_DEC_SHIFT_LOW;
+ break;
+ case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_VERY_LOW:
+ wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_VERY_LOW;
+ wakeup_other.dec_shift = ERTS_WAKEUP_OTHER_DEC_SHIFT_VERY_LOW;
+ break;
+ }
+ if (wakeup_other.dec_shift < 0)
+ wakeup_other.dec_mask = (1 << (sizeof(wakeup_other.dec_mask)*8
+ + wakeup_other.dec_shift)) - 1;
+ else {
+ wakeup_other.dec_mask = 0;
+ wakeup_other.dec_mask = ~wakeup_other.dec_mask;
+ }
+}
+
+static void
+wakeup_other_check_legacy(ErtsRunQueue *rq)
+{
+ int wo_reds = rq->wakeup_other_reds;
+ if (wo_reds) {
+ if (rq->len < 2) {
+ rq->wakeup_other -= ERTS_WAKEUP_OTHER_DEC_LEGACY*wo_reds;
+ if (rq->wakeup_other < 0)
+ rq->wakeup_other = 0;
+ }
+ else if (rq->wakeup_other < wakeup_other.limit)
+ rq->wakeup_other += rq->len*wo_reds + ERTS_WAKEUP_OTHER_FIXED_INC_LEGACY;
+ else {
+ if (erts_smp_atomic32_read_acqb(&no_empty_run_queues) != 0) {
+ wake_scheduler_on_empty_runq(rq);
+ rq->wakeup_other = 0;
+ }
+ rq->wakeup_other = 0;
+ }
+ }
+ rq->wakeup_other_reds = 0;
+}
+
+static void
+wakeup_other_set_limit_legacy(void)
+{
+ switch (wakeup_other.threshold) {
+ case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_VERY_HIGH:
+ wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_VERY_HIGH_LEGACY;
+ break;
+ case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_HIGH:
+ wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_HIGH_LEGACY;
+ break;
+ case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_MEDIUM:
+ wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_MEDIUM_LEGACY;
+ break;
+ case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_LOW:
+ wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_LOW_LEGACY;
+ break;
+ case ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_VERY_LOW:
+ wakeup_other.limit = ERTS_WAKEUP_OTHER_LIMIT_VERY_LOW_LEGACY;
+ break;
+ }
+}
+
+static void
+set_wakeup_other_data(void)
+{
+ switch (wakeup_other.type) {
+ case ERTS_SCHED_WAKEUP_OTHER_TYPE_PROPOSAL:
+ wakeup_other.check = wakeup_other_check;
+ wakeup_other_set_limit();
+ break;
+ case ERTS_SCHED_WAKEUP_OTHER_TYPE_LEGACY:
+ wakeup_other.check = wakeup_other_check_legacy;
+ wakeup_other_set_limit_legacy();
+ break;
+ }
+}
+
+#endif
+
void
erts_early_init_scheduling(int no_schedulers)
{
aux_work_timeout_early_init(no_schedulers);
- wakeup_other_limit = ERTS_WAKEUP_OTHER_LIMIT_MEDIUM;
+#ifdef ERTS_SMP
+ wakeup_other.threshold = ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_MEDIUM;
+ wakeup_other.type = ERTS_SCHED_WAKEUP_OTHER_TYPE_LEGACY;
+#endif
+ sched_busy_wait.sys_schedule = ERTS_SCHED_SYS_SLEEP_SPINCOUNT_MEDIUM;
+ sched_busy_wait.tse = (ERTS_SCHED_SYS_SLEEP_SPINCOUNT_MEDIUM
+ * ERTS_SCHED_TSE_SLEEP_SPINCOUNT_FACT);
+ sched_busy_wait.aux_work = (ERTS_SCHED_SYS_SLEEP_SPINCOUNT_MEDIUM
+ * ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_MEDIUM);
}
int
-erts_sched_set_wakeup_limit(char *str)
+erts_sched_set_wakeup_other_thresold(char *str)
{
+ ErtsSchedWakeupOtherThreshold threshold;
if (sys_strcmp(str, "very_high") == 0)
- wakeup_other_limit = ERTS_WAKEUP_OTHER_LIMIT_VERY_HIGH;
+ threshold = ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_VERY_HIGH;
else if (sys_strcmp(str, "high") == 0)
- wakeup_other_limit = ERTS_WAKEUP_OTHER_LIMIT_HIGH;
+ threshold = ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_HIGH;
else if (sys_strcmp(str, "medium") == 0)
- wakeup_other_limit = ERTS_WAKEUP_OTHER_LIMIT_MEDIUM;
+ threshold = ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_MEDIUM;
else if (sys_strcmp(str, "low") == 0)
- wakeup_other_limit = ERTS_WAKEUP_OTHER_LIMIT_LOW;
+ threshold = ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_LOW;
else if (sys_strcmp(str, "very_low") == 0)
- wakeup_other_limit = ERTS_WAKEUP_OTHER_LIMIT_VERY_LOW;
+ threshold = ERTS_SCHED_WAKEUP_OTHER_THRESHOLD_VERY_LOW;
+ else
+ return EINVAL;
+#ifdef ERTS_SMP
+ wakeup_other.threshold = threshold;
+ set_wakeup_other_data();
+#endif
+ return 0;
+}
+
+int
+erts_sched_set_wakeup_other_type(char *str)
+{
+ ErtsSchedWakeupOtherType type;
+ if (sys_strcmp(str, "proposal") == 0)
+ type = ERTS_SCHED_WAKEUP_OTHER_TYPE_PROPOSAL;
+ else if (sys_strcmp(str, "default") == 0)
+ type = ERTS_SCHED_WAKEUP_OTHER_TYPE_LEGACY;
+ else if (sys_strcmp(str, "legacy") == 0)
+ type = ERTS_SCHED_WAKEUP_OTHER_TYPE_LEGACY;
else
return EINVAL;
+#ifdef ERTS_SMP
+ wakeup_other.type = type;
+#endif
return 0;
}
+int
+erts_sched_set_busy_wait_threshold(char *str)
+{
+ int sys_sched;
+ int aux_work_fact;
+
+ if (sys_strcmp(str, "very_long") == 0) {
+ sys_sched = ERTS_SCHED_SYS_SLEEP_SPINCOUNT_VERY_LONG;
+ aux_work_fact = ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_VERY_LONG;
+ }
+ else if (sys_strcmp(str, "long") == 0) {
+ sys_sched = ERTS_SCHED_SYS_SLEEP_SPINCOUNT_LONG;
+ aux_work_fact = ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_LONG;
+ }
+ else if (sys_strcmp(str, "medium") == 0) {
+ sys_sched = ERTS_SCHED_SYS_SLEEP_SPINCOUNT_MEDIUM;
+ aux_work_fact = ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_MEDIUM;
+ }
+ else if (sys_strcmp(str, "short") == 0) {
+ sys_sched = ERTS_SCHED_SYS_SLEEP_SPINCOUNT_SHORT;
+ aux_work_fact = ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_SHORT;
+ }
+ else if (sys_strcmp(str, "very_short") == 0) {
+ sys_sched = ERTS_SCHED_SYS_SLEEP_SPINCOUNT_VERY_SHORT;
+ aux_work_fact = ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_VERY_SHORT;
+ }
+ else if (sys_strcmp(str, "none") == 0) {
+ sys_sched = ERTS_SCHED_SYS_SLEEP_SPINCOUNT_NONE;
+ aux_work_fact = ERTS_SCHED_AUX_WORK_SLEEP_SPINCOUNT_FACT_NONE;
+ }
+ else {
+ return EINVAL;
+ }
+
+ sched_busy_wait.sys_schedule = sys_sched;
+ sched_busy_wait.tse = sys_sched*ERTS_SCHED_TSE_SLEEP_SPINCOUNT_FACT;
+ sched_busy_wait.aux_work = sys_sched*aux_work_fact;
+
+ return 0;
+}
static void
init_aux_work_data(ErtsAuxWorkData *awdp, ErtsSchedulerData *esdp)
{
@@ -3613,6 +3869,10 @@ erts_init_scheduling(int no_schedulers, int no_schedulers_online)
init_misc_op_list_alloc();
+#ifdef ERTS_SMP
+ set_wakeup_other_data();
+#endif
+
ASSERT(no_schedulers_online <= no_schedulers);
ASSERT(no_schedulers_online >= 1);
ASSERT(no_schedulers >= 1);
@@ -6502,26 +6762,7 @@ Process *schedule(Process *p, int calls)
exec_misc_ops(rq);
#ifdef ERTS_SMP
- {
- int wo_reds = rq->wakeup_other_reds;
- if (wo_reds) {
- if (rq->len < 2) {
- rq->wakeup_other -= ERTS_WAKEUP_OTHER_DEC*wo_reds;
- if (rq->wakeup_other < 0)
- rq->wakeup_other = 0;
- }
- else if (rq->wakeup_other < wakeup_other_limit)
- rq->wakeup_other += rq->len*wo_reds + ERTS_WAKEUP_OTHER_FIXED_INC;
- else {
- if (erts_smp_atomic32_read_acqb(&no_empty_run_queues) != 0) {
- wake_scheduler_on_empty_runq(rq);
- rq->wakeup_other = 0;
- }
- rq->wakeup_other = 0;
- }
- }
- rq->wakeup_other_reds = 0;
- }
+ wakeup_other.check(rq);
#endif
/*