Date: Wed, 29 Aug 2012 15:28:38 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r239838 - stable/9/sys/kern Message-ID: <201208291528.q7TFScrj068198@svn.freebsd.org>
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Author: kib Date: Wed Aug 29 15:28:38 2012 New Revision: 239838 URL: http://svn.freebsd.org/changeset/base/239838 Log: MFC r236516: Count and export the number of prefaulting happen. Modified: stable/9/sys/kern/vfs_vnops.c Directory Properties: stable/9/sys/ (props changed) Modified: stable/9/sys/kern/vfs_vnops.c ============================================================================== --- stable/9/sys/kern/vfs_vnops.c Wed Aug 29 15:21:27 2012 (r239837) +++ stable/9/sys/kern/vfs_vnops.c Wed Aug 29 15:28:38 2012 (r239838) @@ -56,6 +56,7 @@ __FBSDID("$FreeBSD$"); #include <sys/filio.h> #include <sys/resourcevar.h> #include <sys/sx.h> +#include <sys/sysctl.h> #include <sys/ttycom.h> #include <sys/conf.h> #include <sys/syslog.h> @@ -766,6 +767,9 @@ unlock: } static const int io_hold_cnt = 16; +static unsigned long vn_io_faults_cnt; +SYSCTL_LONG(_debug, OID_AUTO, vn_io_faults, CTLFLAG_RD, + &vn_io_faults_cnt, 0, "Count of vn_io_fault lock avoidance triggers"); /* * The vn_io_fault() is a wrapper around vn_read() and vn_write() to @@ -863,6 +867,7 @@ vn_io_fault(struct file *fp, struct uio if (error != EFAULT) goto out; + atomic_add_long(&vn_io_faults_cnt, 1); uio_clone->uio_segflg = UIO_NOCOPY; uiomove(NULL, resid - uio->uio_resid, uio_clone); uio_clone->uio_segflg = uio->uio_segflg;
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