- Move rusage from being per-process in struct pstats to per-thread in

   td_ru.  This removes the requirement for per-process synchronization in
   statclock() and mi_switch().  This was previously supported by
   sched_lock which is going away.  All modifications to rusage are now
   done in the context of the owning thread.  reads proceed without locks.
 - Aggregate exiting threads rusage in thread_exit() such that the exiting
   thread's rusage is not lost.
 - Provide a new routine, rufetch() to fetch an aggregate of all rusage
   structures from all threads in a process.  This routine must be used
   in any place requiring a rusage from a process prior to it's exit.  The
   exited process's rusage is still available via p_ru.
 - Aggregate tick statistics only on demand via rufetch() or when a thread
   exits.  Tick statistics are kept in the thread and protected by sched_lock
   until it exits.

Initial patch by:	attilio
Reviewed by:		attilio, bde (some objections), arch (mostly silent)

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/kern/kern_proc.c b/sys/kern/kern_proc.c
index b5fe77d..a8ac12e 100644
--- a/sys/kern/kern_proc.c
+++ b/sys/kern/kern_proc.c
@@ -693,12 +693,12 @@ fill_kinfo_proc_only(struct proc *p, struct kinfo_proc *kp)
 	kp->ki_swtime = p->p_swtime;
 	kp->ki_pid = p->p_pid;
 	kp->ki_nice = p->p_nice;
+	rufetch(p, &kp->ki_rusage);
 	kp->ki_runtime = cputick2usec(p->p_rux.rux_runtime);
 	mtx_unlock_spin(&sched_lock);
 	if ((p->p_sflag & PS_INMEM) && p->p_stats != NULL) {
 		kp->ki_start = p->p_stats->p_start;
 		timevaladd(&kp->ki_start, &boottime);
-		kp->ki_rusage = p->p_stats->p_ru;
 		calcru(p, &kp->ki_rusage.ru_utime, &kp->ki_rusage.ru_stime);
 		calccru(p, &kp->ki_childutime, &kp->ki_childstime);