From: beck <beck@openbsd.org>
Date: Sun, 16 Apr 2017 14:24:03 +0000 (+0000)
Subject: Statistics for high memory flips in the buffer cache
X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=ed1792d6a5dad4e0a680a3d98e03ee987da12d68;p=openbsd

Statistics for high memory flips in the buffer cache
nits from deraadt@
ok krw@ guenther@ kettenis@
---

diff --git a/sys/sys/mount.h b/sys/sys/mount.h
index 90ce21e2117..8a58bcd5e00 100644
--- a/sys/sys/mount.h
+++ b/sys/sys/mount.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: mount.h,v 1.129 2017/04/15 13:56:43 bluhm Exp $	*/
+/*	$OpenBSD: mount.h,v 1.130 2017/04/16 14:24:03 beck Exp $	*/
 /*	$NetBSD: mount.h,v 1.48 1996/02/18 11:55:47 fvdl Exp $	*/
 
 /*
@@ -487,6 +487,9 @@ struct bcachestats {
 	int64_t delwribufs;		/* delayed write buffers */
 	int64_t kvaslots;		/* kva slots total */
 	int64_t kvaslots_avail;		/* available kva slots */
+	int64_t highflips;		/* total flips to above DMA */
+	int64_t highflops;		/* total failed flips to above DMA */
+	int64_t dmaflips;		/* total flips from high to DMA */
 };
 #ifdef _KERNEL
 extern struct bcachestats bcstats;
diff --git a/usr.bin/systat/iostat.c b/usr.bin/systat/iostat.c
index a0bb03e11bc..ae32ff09eff 100644
--- a/usr.bin/systat/iostat.c
+++ b/usr.bin/systat/iostat.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: iostat.c,v 1.46 2017/04/02 00:27:44 beck Exp $	*/
+/*	$OpenBSD: iostat.c,v 1.47 2017/04/16 14:24:03 beck Exp $	*/
 /*	$NetBSD: iostat.c,v 1.5 1996/05/10 23:16:35 thorpej Exp $	*/
 
 /*
@@ -257,4 +257,16 @@ showbcache(void)
 	print_fld_str(FLD_IO_SSTR, "cache hits");
 	print_fld_ssize(FLD_IO_SVAL, bccur.cachehits - bclast.cachehits);
 	end_line();
+
+	print_fld_str(FLD_IO_SSTR, "high flips");
+	print_fld_ssize(FLD_IO_SVAL, bccur.highflips - bclast.highflips);
+	end_line();
+
+	print_fld_str(FLD_IO_SSTR, "high flops");
+	print_fld_ssize(FLD_IO_SVAL, bccur.highflops - bclast.highflops);
+	end_line();
+
+	print_fld_str(FLD_IO_SSTR, "dma flips");
+	print_fld_ssize(FLD_IO_SVAL, bccur.dmaflips - bclast.dmaflips);
+	end_line();
 }