- 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, 3 insertions, 3 deletions

diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c
index 44879ff..18c6d59 100644
--- a/sys/kern/vfs_bio.c
+++ b/sys/kern/vfs_bio.c
@@ -746,7 +746,7 @@ breada(struct vnode * vp, daddr_t * rablkno, int * rabsize,
 
 		if ((rabp->b_flags & B_CACHE) == 0) {
 			if (!TD_IS_IDLETHREAD(curthread))
-				curthread->td_proc->p_stats->p_ru.ru_inblock++;
+				curthread->td_ru.ru_inblock++;
 			rabp->b_flags |= B_ASYNC;
 			rabp->b_flags &= ~B_INVAL;
 			rabp->b_ioflags &= ~BIO_ERROR;
@@ -781,7 +781,7 @@ breadn(struct vnode * vp, daddr_t blkno, int size,
 	/* if not found in cache, do some I/O */
 	if ((bp->b_flags & B_CACHE) == 0) {
 		if (!TD_IS_IDLETHREAD(curthread))
-			curthread->td_proc->p_stats->p_ru.ru_inblock++;
+			curthread->td_ru.ru_inblock++;
 		bp->b_iocmd = BIO_READ;
 		bp->b_flags &= ~B_INVAL;
 		bp->b_ioflags &= ~BIO_ERROR;
@@ -860,7 +860,7 @@ bufwrite(struct buf *bp)
 	atomic_add_int(&runningbufspace, bp->b_runningbufspace);
 
 	if (!TD_IS_IDLETHREAD(curthread))
-		curthread->td_proc->p_stats->p_ru.ru_oublock++;
+		curthread->td_ru.ru_oublock++;
 	if (oldflags & B_ASYNC)
 		BUF_KERNPROC(bp);
 	bp->b_iooffset = dbtob(bp->b_blkno);