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authorRickard Green <rickard@erlang.org>2016-12-30 17:15:53 +0100
committerRickard Green <rickard@erlang.org>2016-12-30 17:15:53 +0100
commit765e63dbffc4ec7f8cc3a7a1463151d6d863746f (patch)
tree8c63f05a28cf31915b182a2234d219f7d367742f
parent3473ecd83a7bbe7e0bebb865f25dddb93e3bf10f (diff)
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Multi scheduling block bug-fixes
-rw-r--r--erts/emulator/beam/erl_process.c80
-rw-r--r--erts/emulator/beam/erl_process.h2
2 files changed, 52 insertions, 30 deletions
diff --git a/erts/emulator/beam/erl_process.c b/erts/emulator/beam/erl_process.c
index b345c35a7e..58097ad42f 100644
--- a/erts/emulator/beam/erl_process.c
+++ b/erts/emulator/beam/erl_process.c
@@ -7055,12 +7055,18 @@ typedef struct {
} ErtsSchdlrSspndResume;
static void
-schdlr_sspnd_resume_proc(Eterm pid)
+schdlr_sspnd_resume_proc(ErtsSchedType sched_type, Eterm pid)
{
- Process *p = erts_pid2proc(NULL, 0, pid, ERTS_PROC_LOCK_STATUS);
+ Process *p;
+ p = erts_pid2proc_opt(NULL, 0, pid, ERTS_PROC_LOCK_STATUS,
+ (sched_type != ERTS_SCHED_NORMAL
+ ? ERTS_P2P_FLG_INC_REFC
+ : 0));
if (p) {
resume_process(p, ERTS_PROC_LOCK_STATUS);
erts_smp_proc_unlock(p, ERTS_PROC_LOCK_STATUS);
+ if (sched_type != ERTS_SCHED_NORMAL)
+ erts_proc_dec_refc(p);
}
}
@@ -7069,17 +7075,20 @@ schdlr_sspnd_resume_procs(ErtsSchedType sched_type,
ErtsSchdlrSspndResume *resume)
{
if (is_internal_pid(resume->onln.chngr)) {
- schdlr_sspnd_resume_proc(resume->onln.chngr);
+ schdlr_sspnd_resume_proc(sched_type,
+ resume->onln.chngr);
resume->onln.chngr = NIL;
}
if (is_internal_pid(resume->onln.nxt)) {
- schdlr_sspnd_resume_proc(resume->onln.nxt);
+ schdlr_sspnd_resume_proc(sched_type,
+ resume->onln.nxt);
resume->onln.nxt = NIL;
}
while (resume->msb.chngrs) {
ErtsProcList *plp = resume->msb.chngrs;
resume->msb.chngrs = plp->next;
- schdlr_sspnd_resume_proc(plp->pid);
+ schdlr_sspnd_resume_proc(sched_type,
+ plp->pid);
proclist_destroy(plp);
}
}
@@ -7198,15 +7207,18 @@ suspend_scheduler(ErtsSchedulerData *esdp)
(void) erts_proclist_fetch(&msb[i]->chngq, &end_plp);
/* resume processes that initiated the multi scheduling block... */
plp = msb[i]->chngq;
- while (plp) {
- erts_proclist_store_last(&msb[i]->blckrs,
- proclist_copy(plp));
- plp = plp->next;
- }
- if (end_plp)
+ if (plp) {
+ ASSERT(end_plp);
+ ASSERT(msb[i]->ongoing);
+ do {
+ erts_proclist_store_last(&msb[i]->blckrs,
+ proclist_copy(plp));
+ plp = plp->next;
+ } while (plp);
end_plp->next = resume.msb.chngrs;
- resume.msb.chngrs = msb[i]->chngq;
- msb[i]->chngq = NULL;
+ resume.msb.chngrs = msb[i]->chngq;
+ msb[i]->chngq = NULL;
+ }
}
}
}
@@ -7415,12 +7427,23 @@ suspend_scheduler(ErtsSchedulerData *esdp)
schdlr_sspnd_inc_nscheds(&schdlr_sspnd.active, sched_type);
changing = erts_smp_atomic32_read_nob(&schdlr_sspnd.changing);
- if ((changing & ERTS_SCHDLR_SSPND_CHNG_MSB)
- && schdlr_sspnd.online == schdlr_sspnd.active) {
- erts_smp_atomic32_read_band_nob(&schdlr_sspnd.changing,
- ~ERTS_SCHDLR_SSPND_CHNG_MSB);
- }
-
+ if (changing) {
+ if ((changing & ERTS_SCHDLR_SSPND_CHNG_MSB)
+ && !schdlr_sspnd.msb.ongoing
+ && schdlr_sspnd.online == schdlr_sspnd.active) {
+ erts_smp_atomic32_read_band_nob(&schdlr_sspnd.changing,
+ ~ERTS_SCHDLR_SSPND_CHNG_MSB);
+ }
+ if ((changing & ERTS_SCHDLR_SSPND_CHNG_NMSB)
+ && !schdlr_sspnd.nmsb.ongoing
+ && (schdlr_sspnd_get_nscheds(&schdlr_sspnd.online,
+ ERTS_SCHED_NORMAL)
+ == schdlr_sspnd_get_nscheds(&schdlr_sspnd.active,
+ ERTS_SCHED_NORMAL))) {
+ erts_smp_atomic32_read_band_nob(&schdlr_sspnd.changing,
+ ~ERTS_SCHDLR_SSPND_CHNG_NMSB);
+ }
+ }
ASSERT(no <= schdlr_sspnd_get_nscheds(&schdlr_sspnd.online, sched_type));
ASSERT((sched_type == ERTS_SCHED_NORMAL
? !(schdlr_sspnd.msb.ongoing|schdlr_sspnd.nmsb.ongoing)
@@ -7553,7 +7576,7 @@ abort_sched_onln_chng_waitq(Process *p)
erts_smp_mtx_unlock(&schdlr_sspnd.mtx);
if (is_internal_pid(resume))
- schdlr_sspnd_resume_proc(resume);
+ schdlr_sspnd_resume_proc(ERTS_SCHED_NORMAL, resume);
}
ErtsSchedSuspendResult
@@ -7951,21 +7974,20 @@ erts_block_multi_scheduling(Process *p, ErtsProcLocks plocks, int on, int normal
}
else { /* ------ UNBLOCK ------ */
if (p->flags & have_blckd_flg) {
- ErtsProcList *plps[2];
+ ErtsProcList **plpps[3] = {0};
ErtsProcList *plp;
- int limit = 0;
- plps[limit++] = erts_proclist_peek_first(msbp->blckrs);
- if (all)
- plps[limit++] = erts_proclist_peek_first(msbp->chngq);
+ plpps[0] = &msbp->blckrs;
+ if (all)
+ plpps[1] = &msbp->chngq;
- for (ix = 0; ix < limit; ix++) {
- plp = plps[ix];
+ for (ix = 0; plpps[ix]; ix++) {
+ plp = erts_proclist_peek_first(*plpps[ix]);
while (plp) {
ErtsProcList *tmp_plp = plp;
- plp = erts_proclist_peek_next(msbp->blckrs, plp);
+ plp = erts_proclist_peek_next(*plpps[ix], plp);
if (erts_proclist_same(tmp_plp, p)) {
- erts_proclist_remove(&msbp->blckrs, tmp_plp);
+ erts_proclist_remove(plpps[ix], tmp_plp);
proclist_destroy(tmp_plp);
if (!all)
break;
diff --git a/erts/emulator/beam/erl_process.h b/erts/emulator/beam/erl_process.h
index 9f7084c127..68fbb10602 100644
--- a/erts/emulator/beam/erl_process.h
+++ b/erts/emulator/beam/erl_process.h
@@ -1684,7 +1684,7 @@ ERTS_GLB_INLINE ErtsProcList *erts_proclist_fetch_first(ErtsProcList **list)
return NULL;
else {
ErtsProcList *res = *list;
- if (res == *list)
+ if (res->next == *list)
*list = NULL;
else
*list = res->next;