- 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, 0 deletions

diff --git a/sys/kern/init_main.c b/sys/kern/init_main.c
index 9306e83..8f99b19 100644
--- a/sys/kern/init_main.c
+++ b/sys/kern/init_main.c
@@ -431,6 +431,7 @@ proc0_init(void *dummy __unused)
 	bcopy("swapper", p->p_comm, sizeof ("swapper"));
 
 	callout_init(&p->p_itcallout, CALLOUT_MPSAFE);
+	callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
 	callout_init(&td->td_slpcallout, CALLOUT_MPSAFE);
 
 	/* Create credentials. */