- 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, 2 insertions, 2 deletions

diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c
index fe2bbbe..dc02346 100644
--- a/sys/kern/kern_sig.c
+++ b/sys/kern/kern_sig.c
@@ -1868,7 +1868,7 @@ trapsignal(struct thread *td, ksiginfo_t *ksi)
 	mtx_lock(&ps->ps_mtx);
 	if ((p->p_flag & P_TRACED) == 0 && SIGISMEMBER(ps->ps_sigcatch, sig) &&
 	    !SIGISMEMBER(td->td_sigmask, sig)) {
-		p->p_stats->p_ru.ru_nsignals++;
+		td->td_ru.ru_nsignals++;
 #ifdef KTRACE
 		if (KTRPOINT(curthread, KTR_PSIG))
 			ktrpsig(sig, ps->ps_sigact[_SIG_IDX(sig)],
@@ -2781,7 +2781,7 @@ postsig(sig)
 				SIGADDSET(ps->ps_sigignore, sig);
 			ps->ps_sigact[_SIG_IDX(sig)] = SIG_DFL;
 		}
-		p->p_stats->p_ru.ru_nsignals++;
+		td->td_ru.ru_nsignals++;
 		if (p->p_sig != sig) {
 			code = 0;
 		} else {