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authorRickard Green <[email protected]>2014-10-23 10:41:49 +0200
committerRickard Green <[email protected]>2014-10-23 10:41:49 +0200
commite97f9bc1672cb2d2c07d4133030528b43b26532c (patch)
treecd519abf66793978459558f38f64e554c31432db /erts/emulator/beam/erl_process.c
parentff3fae223431a9cb0d2a2852a07f9447960c92ed (diff)
parent404c44d58058da8cfead5dd310fcb24bf3e8d344 (diff)
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Merge branch 'rickard/maint-17/eager-check-io/OTP-12117' into maint
* rickard/maint-17/eager-check-io/OTP-12117: No eager check I/O on OSE Introduce support for eager check I/O scheduling
Diffstat (limited to 'erts/emulator/beam/erl_process.c')
-rw-r--r--erts/emulator/beam/erl_process.c68
1 files changed, 46 insertions, 22 deletions
diff --git a/erts/emulator/beam/erl_process.c b/erts/emulator/beam/erl_process.c
index 20a88ec581..e5bb1203c8 100644
--- a/erts/emulator/beam/erl_process.c
+++ b/erts/emulator/beam/erl_process.c
@@ -148,6 +148,12 @@ extern BeamInstr beam_apply[];
extern BeamInstr beam_exit[];
extern BeamInstr beam_continue_exit[];
+#ifdef __OSE__
+/* Eager check I/O not supported on OSE yet. */
+int erts_eager_check_io = 0;
+#else
+int erts_eager_check_io = 0;
+#endif
int erts_sched_compact_load;
int erts_sched_balance_util = 0;
Uint erts_no_schedulers;
@@ -2381,29 +2387,47 @@ try_set_sys_scheduling(void)
#endif
static ERTS_INLINE int
-prepare_for_sys_schedule(ErtsSchedulerData *esdp)
+prepare_for_sys_schedule(ErtsSchedulerData *esdp, int non_blocking)
{
+ if (non_blocking && erts_eager_check_io) {
#ifdef ERTS_SMP
- while (!erts_port_task_have_outstanding_io_tasks()
- && try_set_sys_scheduling()) {
#ifdef ERTS_SCHED_ONLY_POLL_SCHED_1
- if (esdp->no != 1) {
- /* If we are not scheduler 1 and ERTS_SCHED_ONLY_POLL_SCHED_1 is used
- then we make sure to wake scheduler 1 */
- ErtsRunQueue *rq = ERTS_RUNQ_IX(0);
- clear_sys_scheduling();
- wake_scheduler(rq);
- return 0;
- }
+ if (esdp->no != 1) {
+ /* If we are not scheduler 1 and ERTS_SCHED_ONLY_POLL_SCHED_1 is used
+ then we make sure to wake scheduler 1 */
+ ErtsRunQueue *rq = ERTS_RUNQ_IX(0);
+ wake_scheduler(rq);
+ return 0;
+ }
#endif
- if (!erts_port_task_have_outstanding_io_tasks())
+ return try_set_sys_scheduling();
+#else
return 1;
- clear_sys_scheduling();
+#endif
}
- return 0;
+ else {
+#ifdef ERTS_SMP
+ while (!erts_port_task_have_outstanding_io_tasks()
+ && try_set_sys_scheduling()) {
+#ifdef ERTS_SCHED_ONLY_POLL_SCHED_1
+ if (esdp->no != 1) {
+ /* If we are not scheduler 1 and ERTS_SCHED_ONLY_POLL_SCHED_1 is used
+ then we make sure to wake scheduler 1 */
+ ErtsRunQueue *rq = ERTS_RUNQ_IX(0);
+ clear_sys_scheduling();
+ wake_scheduler(rq);
+ return 0;
+ }
+#endif
+ if (!erts_port_task_have_outstanding_io_tasks())
+ return 1;
+ clear_sys_scheduling();
+ }
+ return 0;
#else
- return !erts_port_task_have_outstanding_io_tasks();
+ return !erts_port_task_have_outstanding_io_tasks();
#endif
+ }
}
#ifdef ERTS_SMP
@@ -2780,7 +2804,7 @@ scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq)
* be waiting in erl_sys_schedule()
*/
- if (ERTS_SCHEDULER_IS_DIRTY(esdp) || !prepare_for_sys_schedule(esdp)) {
+ if (ERTS_SCHEDULER_IS_DIRTY(esdp) || !prepare_for_sys_schedule(esdp, 0)) {
sched_waiting(esdp->no, rq);
@@ -2944,7 +2968,7 @@ scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq)
* Got to check that we still got I/O tasks; otherwise
* we have to continue checking for I/O...
*/
- if (!prepare_for_sys_schedule(esdp)) {
+ if (!prepare_for_sys_schedule(esdp, 0)) {
spincount *= ERTS_SCHED_TSE_SLEEP_SPINCOUNT_FACT;
goto tse_wait;
}
@@ -2966,7 +2990,7 @@ scheduler_wait(int *fcalls, ErtsSchedulerData *esdp, ErtsRunQueue *rq)
* Got to check that we still got I/O tasks; otherwise
* we have to wait in erl_sys_schedule() after all...
*/
- if (!prepare_for_sys_schedule(esdp)) {
+ if (!prepare_for_sys_schedule(esdp, 0)) {
/*
* Not allowed to wait in erl_sys_schedule;
* do tse wait instead...
@@ -9200,7 +9224,7 @@ Process *schedule(Process *p, int calls)
}
else if (!ERTS_SCHEDULER_IS_DIRTY(esdp) &&
(fcalls > input_reductions &&
- prepare_for_sys_schedule(esdp))) {
+ prepare_for_sys_schedule(esdp, !0))) {
/*
* Schedule system-level activities.
*/
@@ -9208,8 +9232,6 @@ Process *schedule(Process *p, int calls)
erts_smp_atomic32_set_relb(&function_calls, 0);
fcalls = 0;
- ASSERT(!erts_port_task_have_outstanding_io_tasks());
-
#if 0 /* Not needed since we wont wait in sys schedule */
erts_sys_schedule_interrupt(0);
#endif
@@ -9241,7 +9263,9 @@ Process *schedule(Process *p, int calls)
if (RUNQ_READ_LEN(&rq->ports.info.len)) {
int have_outstanding_io;
have_outstanding_io = erts_port_task_execute(rq, &esdp->current_port);
- if ((have_outstanding_io && fcalls > 2*input_reductions)
+ if ((!erts_eager_check_io
+ && have_outstanding_io
+ && fcalls > 2*input_reductions)
|| rq->halt_in_progress) {
/*
* If we have performed more than 2*INPUT_REDUCTIONS since