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Add user priority loaning code to support priority propagation for

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1:1 threading's POSIX priority mutexes, the code is no-op unless
priority-aware umtx code is committed.
This commit is contained in:
David Xu 2006-08-25 06:12:53 +00:00
parent ac5cc9e9bc
commit 3db720fdce
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=161599
6 changed files with 184 additions and 10 deletions
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5
sys/kern/kern_umtx.c
View File

@ -601,6 +601,11 @@ kern_umtx_wake(struct thread *td, void *uaddr, int n_wake)
return (0);
}
void
umtx_pi_adjust(struct thread *td __unused, u_char oldpri __unused)
{
}
int
_umtx_lock(struct thread *td, struct _umtx_lock_args *uap)
/* struct umtx *umtx */

57
sys/kern/sched_4bsd.c
View File

@ -53,6 +53,7 @@ __FBSDID("$FreeBSD$");
#include <sys/sysctl.h>
#include <sys/sx.h>
#include <sys/turnstile.h>
#include <sys/umtx.h>
#include <machine/pcb.h>
#include <machine/smp.h>
@ -586,7 +587,7 @@ resetpriority(struct ksegrp *kg)
NICE_WEIGHT * (kg->kg_proc->p_nice - PRIO_MIN);
newpriority = min(max(newpriority, PRI_MIN_TIMESHARE),
PRI_MAX_TIMESHARE);
kg->kg_user_pri = newpriority;
sched_user_prio(kg, newpriority);
}
}
@ -863,6 +864,60 @@ sched_prio(struct thread *td, u_char prio)
turnstile_adjust(td, oldprio);
}
void
sched_user_prio(struct ksegrp *kg, u_char prio)
{
struct thread *td;
u_char oldprio;
kg->kg_base_user_pri = prio;
/* XXXKSE only for 1:1 */
td = TAILQ_FIRST(&kg->kg_threads);
if (td == NULL) {
kg->kg_user_pri = prio;
return;
}
if (td->td_flags & TDF_UBORROWING && kg->kg_user_pri <= prio)
return;
oldprio = kg->kg_user_pri;
kg->kg_user_pri = prio;
if (TD_ON_UPILOCK(td) && oldprio != prio)
umtx_pi_adjust(td, oldprio);
}
void
sched_lend_user_prio(struct thread *td, u_char prio)
{
u_char oldprio;
td->td_flags |= TDF_UBORROWING;
oldprio = td->td_ksegrp->kg_user_pri;
td->td_ksegrp->kg_user_pri = prio;
if (TD_ON_UPILOCK(td) && oldprio != prio)
umtx_pi_adjust(td, oldprio);
}
void
sched_unlend_user_prio(struct thread *td, u_char prio)
{
struct ksegrp *kg = td->td_ksegrp;
u_char base_pri;
base_pri = kg->kg_base_user_pri;
if (prio >= base_pri) {
td->td_flags &= ~TDF_UBORROWING;
sched_user_prio(kg, base_pri);
} else
sched_lend_user_prio(td, prio);
}
void
sched_sleep(struct thread *td)
{

67
sys/kern/sched_core.c
View File

@ -49,6 +49,7 @@ __FBSDID("$FreeBSD$");
#include <sys/sysctl.h>
#include <sys/sysproto.h>
#include <sys/turnstile.h>
#include <sys/umtx.h>
#include <sys/unistd.h>
#include <sys/vmmeter.h>
#ifdef KTRACE
@ -633,7 +634,7 @@ sched_calc_pri(struct ksegrp *kg)
pri = PUSER_MAX;
return (pri);
}
return (kg->kg_user_pri);
return (kg->kg_base_user_pri);
}
static int
@ -646,7 +647,7 @@ sched_recalc_pri(struct kse *ke, uint64_t now)
kg = ke->ke_ksegrp;
delta = now - ke->ke_timestamp;
if (__predict_false(!sched_is_timeshare(kg)))
return (kg->kg_user_pri);
return (kg->kg_base_user_pri);
if (delta > NS_MAX_SLEEP_TIME)
sleep_time = NS_MAX_SLEEP_TIME;
@ -947,6 +948,60 @@ sched_prio(struct thread *td, u_char prio)
turnstile_adjust(td, oldprio);
}
void
sched_user_prio(struct ksegrp *kg, u_char prio)
{
struct thread *td;
u_char oldprio;
kg->kg_base_user_pri = prio;
/* XXXKSE only for 1:1 */
td = TAILQ_FIRST(&kg->kg_threads);
if (td == NULL) {
kg->kg_user_pri = prio;
return;
}
if (td->td_flags & TDF_UBORROWING && kg->kg_user_pri <= prio)
return;
oldprio = kg->kg_user_pri;
kg->kg_user_pri = prio;
if (TD_ON_UPILOCK(td) && oldprio != prio)
umtx_pi_adjust(td, oldprio);
}
void
sched_lend_user_prio(struct thread *td, u_char prio)
{
u_char oldprio;
td->td_flags |= TDF_UBORROWING;
oldprio = td->td_ksegrp->kg_user_pri;
td->td_ksegrp->kg_user_pri = prio;
if (TD_ON_UPILOCK(td) && oldprio != prio)
umtx_pi_adjust(td, oldprio);
}
void
sched_unlend_user_prio(struct thread *td, u_char prio)
{
struct ksegrp *kg = td->td_ksegrp;
u_char base_pri;
base_pri = kg->kg_base_user_pri;
if (prio >= base_pri) {
td->td_flags &= ~TDF_UBORROWING;
sched_user_prio(kg, base_pri);
} else
sched_lend_user_prio(td, prio);
}
void
sched_switch(struct thread *td, struct thread *newtd, int flags)
{
@ -1038,7 +1093,7 @@ sched_nice(struct proc *p, int nice)
p->p_nice = nice;
FOREACH_KSEGRP_IN_PROC(p, kg) {
if (kg->kg_pri_class == PRI_TIMESHARE) {
kg->kg_user_pri = sched_calc_pri(kg);
sched_user_prio(kg, sched_calc_pri(kg));
FOREACH_THREAD_IN_GROUP(kg, td)
td->td_flags |= TDF_NEEDRESCHED;
}
@ -1082,7 +1137,7 @@ sched_wakeup(struct thread *td)
now = now - mykseq->ksq_last_timestamp +
kseq->ksq_last_timestamp;
#endif
kg->kg_user_pri = sched_recalc_pri(ke, now);
sched_user_prio(kg, sched_recalc_pri(ke, now));
}
}
setrunqueue(td, SRQ_BORING);
@ -1109,7 +1164,7 @@ sched_fork_ksegrp(struct thread *td, struct ksegrp *child)
mtx_assert(&sched_lock, MA_OWNED);
child->kg_slptime = kg->kg_slptime * CHILD_WEIGHT / 100;
if (child->kg_pri_class == PRI_TIMESHARE)
child->kg_user_pri = sched_calc_pri(child);
sched_user_prio(child, sched_calc_pri(child));
kg->kg_slptime = kg->kg_slptime * PARENT_WEIGHT / 100;
}
@ -1275,7 +1330,7 @@ sched_tick(void)
td->td_flags |= TDF_NEEDRESCHED;
sched_update_runtime(ke, now);
sched_commit_runtime(ke);
kg->kg_user_pri = sched_calc_pri(kg);
sched_user_prio(kg, sched_calc_pri(kg));
ke->ke_slice = sched_timeslice(ke);
ke->ke_flags &= ~KEF_FIRST_SLICE;
if (ke->ke_flags & KEF_BOUND || td->td_pinned) {

58
sys/kern/sched_ule.c
View File

@ -48,6 +48,7 @@ __FBSDID("$FreeBSD$");
#include <sys/sysctl.h>
#include <sys/sysproto.h>
#include <sys/turnstile.h>
#include <sys/umtx.h>
#include <sys/vmmeter.h>
#ifdef KTRACE
#include <sys/uio.h>
@ -1060,7 +1061,7 @@ sched_priority(struct ksegrp *kg)
else if (pri < PRI_MIN_TIMESHARE)
pri = PRI_MIN_TIMESHARE;
kg->kg_user_pri = pri;
sched_user_prio(kg, pri);
return;
}
@ -1343,6 +1344,60 @@ sched_prio(struct thread *td, u_char prio)
turnstile_adjust(td, oldprio);
}
void
sched_user_prio(struct ksegrp *kg, u_char prio)
{
struct thread *td;
u_char oldprio;
kg->kg_base_user_pri = prio;
/* XXXKSE only for 1:1 */
td = TAILQ_FIRST(&kg->kg_threads);
if (td == NULL) {
kg->kg_user_pri = prio;
return;
}
if (td->td_flags & TDF_UBORROWING && kg->kg_user_pri <= prio)
return;
oldprio = kg->kg_user_pri;
kg->kg_user_pri = prio;
if (TD_ON_UPILOCK(td) && oldprio != prio)
umtx_pi_adjust(td, oldprio);
}
void
sched_lend_user_prio(struct thread *td, u_char prio)
{
u_char oldprio;
td->td_flags |= TDF_UBORROWING;
oldprio = td->td_ksegrp->kg_user_pri;
td->td_ksegrp->kg_user_pri = prio;
if (TD_ON_UPILOCK(td) && oldprio != prio)
umtx_pi_adjust(td, oldprio);
}
void
sched_unlend_user_prio(struct thread *td, u_char prio)
{
struct ksegrp *kg = td->td_ksegrp;
u_char base_pri;
base_pri = kg->kg_base_user_pri;
if (prio >= base_pri) {
td->td_flags &= ~TDF_UBORROWING;
sched_user_prio(kg, base_pri);
} else
sched_lend_user_prio(td, prio);
}
void
sched_switch(struct thread *td, struct thread *newtd, int flags)
{
@ -1519,6 +1574,7 @@ sched_fork_ksegrp(struct thread *td, struct ksegrp *child)
child->kg_slptime = kg->kg_slptime;
child->kg_runtime = kg->kg_runtime;
child->kg_user_pri = kg->kg_user_pri;
child->kg_base_user_pri = kg->kg_base_user_pri;
sched_interact_fork(child);
kg->kg_runtime += tickincr;
sched_interact_update(kg);

5
sys/sys/sched.h
View File

@ -63,12 +63,15 @@ void sched_nice(struct proc *p, int nice);
*/
void sched_exit_thread(struct thread *td, struct thread *child);
void sched_fork_thread(struct thread *td, struct thread *child);
void sched_lend_prio(struct thread *td, u_char prio);
void sched_lend_user_prio(struct thread *td, u_char pri);
fixpt_t sched_pctcpu(struct thread *td);
void sched_prio(struct thread *td, u_char prio);
void sched_lend_prio(struct thread *td, u_char prio);
void sched_sleep(struct thread *td);
void sched_switch(struct thread *td, struct thread *newtd, int flags);
void sched_unlend_prio(struct thread *td, u_char prio);
void sched_unlend_user_prio(struct thread *td, u_char pri);
void sched_user_prio(struct ksegrp *kg, u_char prio);
void sched_userret(struct thread *td);
void sched_wakeup(struct thread *td);

2
sys/sys/umtx.h
View File

@ -142,6 +142,6 @@ struct umtx_q *umtxq_alloc(void);
void umtxq_free(struct umtx_q *);
struct thread;
int kern_umtx_wake(struct thread *td, void *uaddr, int n_wake);
void umtx_pi_adjust(struct thread *td, u_char oldpri);
#endif /* !_KERNEL */
#endif /* !_SYS_UMTX_H_ */