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Give libthr a choice (per system) of scope_system or scope_thread

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scheduling.

MFC after:	4 days
This commit is contained in:
Julian Elischer 2004-09-07 06:33:39 +00:00
parent 3b39173d4b
commit a8b491c121
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=134886
1 changed files with 37 additions and 10 deletions
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47
sys/kern/kern_thr.c
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@ -34,6 +34,7 @@ __FBSDID("$FreeBSD$");
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/sched.h>
#include <sys/sysctl.h>
#include <sys/smp.h>
#include <sys/sysent.h>
#include <sys/systm.h>
@ -47,6 +48,15 @@ __FBSDID("$FreeBSD$");
extern int max_threads_per_proc;
extern int max_groups_per_proc;
SYSCTL_DECL(_kern_threads);
static int thr_scope_sys = 0;
SYSCTL_INT(_kern_threads, OID_AUTO, thr_scope_sys, CTLFLAG_RW,
&thr_scope_sys, 0, "sys or proc scope scheduling");
static int thr_concurency = 0;
SYSCTL_INT(_kern_threads, OID_AUTO, thr_concurrency, CTLFLAG_RW,
&thr_concurrency, 0, "a concurrency value if not default");
/*
* Back end support functions.
*/
@ -79,14 +89,18 @@ thr_create(struct thread *td, struct thr_create_args *uap)
}
/* Initialize our td and new ksegrp.. */
newtd = thread_alloc();
newkg = ksegrp_alloc();
if (thr_scope_sys)
newkg = ksegrp_alloc();
else
newkg = kg;
/*
* Try the copyout as soon as we allocate the td so we don't have to
* tear things down in a failure case below.
*/
id = newtd->td_tid;
if ((error = copyout(&id, uap->id, sizeof(long)))) {
ksegrp_free(newkg);
if (thr_scope_sys)
ksegrp_free(newkg);
thread_free(newtd);
return (error);
}
@ -96,10 +110,12 @@ thr_create(struct thread *td, struct thr_create_args *uap)
bcopy(&td->td_startcopy, &newtd->td_startcopy,
(unsigned) RANGEOF(struct thread, td_startcopy, td_endcopy));
bzero(&newkg->kg_startzero,
(unsigned) RANGEOF(struct ksegrp, kg_startzero, kg_endzero));
bcopy(&kg->kg_startcopy, &newkg->kg_startcopy,
(unsigned) RANGEOF(struct ksegrp, kg_startcopy, kg_endcopy));
if (thr_scope_sys) {
bzero(&newkg->kg_startzero,
(unsigned)RANGEOF(struct ksegrp, kg_startzero, kg_endzero));
bcopy(&kg->kg_startcopy, &newkg->kg_startcopy,
(unsigned)RANGEOF(struct ksegrp, kg_startcopy, kg_endcopy));
}
newtd->td_proc = td->td_proc;
newtd->td_ucred = crhold(td->td_ucred);
@ -108,7 +124,8 @@ thr_create(struct thread *td, struct thr_create_args *uap)
cpu_set_upcall(newtd, td);
error = set_mcontext(newtd, &ctx.uc_mcontext);
if (error != 0) {
ksegrp_free(newkg);
if (thr_scope_sys)
ksegrp_free(newkg);
thread_free(newtd);
crfree(td->td_ucred);
goto out;
@ -116,18 +133,28 @@ thr_create(struct thread *td, struct thr_create_args *uap)
/* Link the thread and kse into the ksegrp and make it runnable. */
PROC_LOCK(td->td_proc);
if (thr_scope_sys) {
sched_init_concurrency(newkg);
} else {
if ((td->td_proc->p_flag & P_HADTHREADS) == 0) {
sched_set_concurrency(kg,
thr_concurrency ? thr_concurrency : (2*mp_ncpus));
}
}
td->td_proc->p_flag |= P_HADTHREADS;
newtd->td_sigmask = td->td_sigmask;
mtx_lock_spin(&sched_lock);
ksegrp_link(newkg, p);
if (thr_scope_sys)
ksegrp_link(newkg, p);
thread_link(newtd, newkg);
mtx_unlock_spin(&sched_lock);
PROC_UNLOCK(p);
sched_init_concurrency(newkg);
/* let the scheduler know about these things. */
mtx_lock_spin(&sched_lock);
sched_fork_ksegrp(td, newkg);
if (thr_scope_sys)
sched_fork_ksegrp(td, newkg);
sched_fork_thread(td, newtd);
TD_SET_CAN_RUN(newtd);