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[src/trunk]: src/share/man/man7 document vm.ubc_direct
details: https://anonhg.NetBSD.org/src/rev/1c4afe7cad7a
branches: trunk
changeset: 846402:1c4afe7cad7a
user: jdolecek <jdolecek%NetBSD.org@localhost>
date: Thu Nov 14 21:23:46 2019 +0000
description:
document vm.ubc_direct
diffstat:
share/man/man7/sysctl.7 | 10 ++++++++--
1 files changed, 8 insertions(+), 2 deletions(-)
diffs (31 lines):
diff -r 5c6a43eb51da -r 1c4afe7cad7a share/man/man7/sysctl.7
--- a/share/man/man7/sysctl.7 Thu Nov 14 20:40:25 2019 +0000
+++ b/share/man/man7/sysctl.7 Thu Nov 14 21:23:46 2019 +0000
@@ -1,4 +1,4 @@
-.\" $NetBSD: sysctl.7,v 1.140 2019/08/05 22:03:10 maya Exp $
+.\" $NetBSD: sysctl.7,v 1.141 2019/11/14 21:23:46 jdolecek Exp $
.\"
.\" Copyright (c) 1993
.\" The Regents of the University of California. All rights reserved.
@@ -29,7 +29,7 @@
.\"
.\" @(#)sysctl.3 8.4 (Berkeley) 5/9/95
.\"
-.Dd August 6, 2019
+.Dd November 14, 2019
.Dt SYSCTL 7
.Os
.Sh NAME
@@ -2531,6 +2531,12 @@
Returns an array of
.Vt struct kinfo_vmentry
objects.
+.It Li vm.ubc_direct
+Use direct map for UBC I/O, avoiding need to map and unmap buffer memory.
+Speeds up operation for fast I/O devices like NVMe, especially
+on multi-CPU systems.
+Only available on some architectures.
+Currently still experimental, default is off.
.It Li vm.uspace ( Dv VM_USPACE )
The number of bytes allocated for each kernel stack.
.It Li vm.uvmexp ( Dv VM_UVMEXP )
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