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| author | kib <kib@FreeBSD.org> | 2012-06-03 16:19:37 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2012-06-03 16:19:37 +0000 |
| commit | 472101ae888fef815b6f37bfc5c1651d953264c0 (patch) | |
| tree | ce77e56578a1e669498da83f7102842dc6580883 | |
| parent | d977144831363366367c6984849c566bbe98e00b (diff) | |
| download | FreeBSD-src-472101ae888fef815b6f37bfc5c1651d953264c0.zip FreeBSD-src-472101ae888fef815b6f37bfc5c1651d953264c0.tar.gz | |
Add a knob to disable vn_io_fault.
MFC after: 1 month
| -rw-r--r-- | sys/kern/vfs_vnops.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c index d5a6bf1..00da3b4 100644 --- a/sys/kern/vfs_vnops.c +++ b/sys/kern/vfs_vnops.c @@ -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 *uio, struct ucred *active_cred, 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)); /* |
