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Date:      Wed, 23 May 2012 18:10:55 +0000 (UTC)
From:      Konstantin Belousov <kib@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r235850 - in head/sys: kern sys vm
Message-ID:  <201205231810.q4NIAteP087924@svn.freebsd.org>
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Author: kib
Date: Wed May 23 18:10:54 2012
New Revision: 235850
URL: http://svn.freebsd.org/changeset/base/235850

Log:
  Calculate the count of per-process cow faults.  Export the count to
  userspace using the obscure spare int field in struct kinfo_proc.
  
  Submitted by:	Andrey Zonov <andrey zonov org>
  MFC after:	1 week

Modified:
  head/sys/kern/kern_proc.c
  head/sys/sys/proc.h
  head/sys/sys/user.h
  head/sys/vm/vm_fault.c

Modified: head/sys/kern/kern_proc.c
==============================================================================
--- head/sys/kern/kern_proc.c	Wed May 23 17:49:59 2012	(r235849)
+++ head/sys/kern/kern_proc.c	Wed May 23 18:10:54 2012	(r235850)
@@ -878,6 +878,9 @@ fill_kinfo_proc_only(struct proc *p, str
 	kp->ki_childtime = kp->ki_childstime;
 	timevaladd(&kp->ki_childtime, &kp->ki_childutime);
 
+	FOREACH_THREAD_IN_PROC(p, td0)
+		kp->ki_cow += td0->td_cow;
+
 	tp = NULL;
 	if (p->p_pgrp) {
 		kp->ki_pgid = p->p_pgrp->pg_id;
@@ -990,6 +993,7 @@ fill_kinfo_thread(struct thread *td, str
 		kp->ki_runtime = cputick2usec(td->td_rux.rux_runtime);
 		kp->ki_pctcpu = sched_pctcpu(td);
 		kp->ki_estcpu = td->td_estcpu;
+		kp->ki_cow = td->td_cow;
 	}
 
 	/* We can't get this anymore but ps etc never used it anyway. */

Modified: head/sys/sys/proc.h
==============================================================================
--- head/sys/sys/proc.h	Wed May 23 17:49:59 2012	(r235849)
+++ head/sys/sys/proc.h	Wed May 23 18:10:54 2012	(r235850)
@@ -247,6 +247,7 @@ struct thread {
 	int		td_slptick;	/* (t) Time at sleep. */
 	int		td_blktick;	/* (t) Time spent blocked. */
 	int		td_swvoltick;	/* (t) Time at last SW_VOL switch. */
+	u_int		td_cow;		/* (*) Number of copy-on-write faults */
 	struct rusage	td_ru;		/* (t) rusage information. */
 	struct rusage_ext td_rux;	/* (t) Internal rusage information. */
 	uint64_t	td_incruntime;	/* (t) Cpu ticks to transfer to proc. */

Modified: head/sys/sys/user.h
==============================================================================
--- head/sys/sys/user.h	Wed May 23 17:49:59 2012	(r235849)
+++ head/sys/sys/user.h	Wed May 23 18:10:54 2012	(r235850)
@@ -159,7 +159,7 @@ struct kinfo_proc {
 	u_int	ki_estcpu;	 	/* Time averaged value of ki_cpticks */
 	u_int	ki_slptime;	 	/* Time since last blocked */
 	u_int	ki_swtime;	 	/* Time swapped in or out */
-	int	ki_spareint1;	 	/* unused (just here for alignment) */
+	u_int	ki_cow;			/* number of copy-on-write faults */
 	u_int64_t ki_runtime;		/* Real time in microsec */
 	struct	timeval ki_start;	/* starting time */
 	struct	timeval ki_childtime;	/* time used by process children */

Modified: head/sys/vm/vm_fault.c
==============================================================================
--- head/sys/vm/vm_fault.c	Wed May 23 17:49:59 2012	(r235849)
+++ head/sys/vm/vm_fault.c	Wed May 23 18:10:54 2012	(r235850)
@@ -805,6 +805,7 @@ vnode_locked:
 			if (!is_first_object_locked)
 				VM_OBJECT_LOCK(fs.object);
 			PCPU_INC(cnt.v_cow_faults);
+			curthread->td_cow++;
 		} else {
 			prot &= ~VM_PROT_WRITE;
 		}

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