Date: Sun, 3 Jun 2012 16:19:37 +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: r236517 - head/sys/kern Message-ID: <201206031619.q53GJb2m071284@svn.freebsd.org>
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Author: kib Date: Sun Jun 3 16:19:37 2012 New Revision: 236517 URL: http://svn.freebsd.org/changeset/base/236517 Log: Add a knob to disable vn_io_fault. MFC after: 1 month Modified: head/sys/kern/vfs_vnops.c Modified: head/sys/kern/vfs_vnops.c ============================================================================== --- head/sys/kern/vfs_vnops.c Sun Jun 3 16:06:56 2012 (r236516) +++ head/sys/kern/vfs_vnops.c Sun Jun 3 16:19:37 2012 (r236517) @@ -697,6 +697,9 @@ unlock: } static const int io_hold_cnt = 16; +static int vn_io_fault_enable = 1; +SYSCTL_INT(_debug, OID_AUTO, vn_io_fault_enable, CTLFLAG_RW, + &vn_io_fault_enable, 0, "Enable vn_io_fault lock avoidance"); 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"); @@ -759,7 +762,8 @@ vn_io_fault(struct file *fp, struct uio vp = fp->f_vnode; if (uio->uio_segflg != UIO_USERSPACE || vp->v_type != VREG || ((mp = vp->v_mount) != NULL && - (mp->mnt_kern_flag & MNTK_NO_IOPF) == 0)) + (mp->mnt_kern_flag & MNTK_NO_IOPF) == 0) || + !vn_io_fault_enable) return (doio(fp, uio, active_cred, flags, td)); /*
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