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authorErlang/OTP <[email protected]>2012-04-25 13:11:31 +0200
committerErlang/OTP <[email protected]>2012-04-25 13:11:31 +0200
commit269c223d7bdf194cc3ea25d792328d8b502d4655 (patch)
tree699f7cc5dd337eee5d07b7689f8cff29c90b748d /erts/emulator/beam/erl_process.c
parent8629cdc77a00384ae4197e7f135285c8efa2c9f3 (diff)
parent447eecd1af7ba3e3a46098d93b88964c0f71ca41 (diff)
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Merge branch 'rickard/sched-busy-wait/OTP-10044' into maint-r15
* rickard/sched-busy-wait/OTP-10044: Add switch controlling scheduler busy wait Conflicts: erts/emulator/beam/erl_process.c erts/emulator/beam/erl_process.h
Diffstat (limited to 'erts/emulator/beam/erl_process.c')
-rw-r--r--erts/emulator/beam/erl_process.c75
1 files changed, 69 insertions, 6 deletions
diff --git a/erts/emulator/beam/erl_process.c b/erts/emulator/beam/erl_process.c
index 3a70f0de0e..09ca536188 100644
--- a/erts/emulator/beam/erl_process.c
+++ b/erts/emulator/beam/erl_process.c
@@ -52,10 +52,20 @@
#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
#if 0 || defined(DEBUG)
@@ -120,6 +130,12 @@ int erts_sched_thread_suggested_stack_size = -1;
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;
@@ -2035,7 +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:
@@ -2086,7 +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));
@@ -2123,7 +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) {
@@ -3735,6 +3753,11 @@ erts_early_init_scheduling(int no_schedulers)
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
@@ -3778,6 +3801,46 @@ erts_sched_set_wakeup_other_type(char *str)
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)
{