svn commit: r243989 - in stable/9: cddl/lib/libdtrace sys/kern sys/modules/dtrace sys/modules/dtrace/dtio sys/modules/dtrace/dtraceall sys/sys
Scott Long
scott4long at yahoo.com
Fri Dec 7 20:07:14 UTC 2012
Publicly, I'll state that I don't think that devstat is the right place for these, and I was hoping to have some time to move them to a better place, or at least fix up the existing problems that are present. This commit shouldn't be considered the final word the stability of this set of SDT probes.
Scott
On Dec 7, 2012, at 12:06 PM, George V. Neville-Neil <gnn at FreeBSD.org> wrote:
> Author: gnn
> Date: Fri Dec 7 19:06:40 2012
> New Revision: 243989
> URL: http://svnweb.freebsd.org/changeset/base/243989
>
> Log:
> MFC: 238366, 240924
>
> Initial commit of an I/O provider for DTrace on FreeBSD.
>
> These probes are most useful when looking into the structures
> they provide, which are listed in io.d. For example:
>
> dtrace -n 'io:kernel::start { printf("%d\n", args[0]->bio_bcount); }'
>
> Note that the I/O systems in FreeBSD and Solaris/Illumos are sufficiently
> different that there is not a 1:1 mapping from scripts that work
> with one to the other.
>
> This commit includes the fix so that our probes use "kernel"
> instead of the Solaris specific "genunix"
>
> Added:
> stable/9/cddl/lib/libdtrace/io.d
> - copied, changed from r236628, head/cddl/lib/libdtrace/io.d
> stable/9/sys/kern/dtio_kdtrace.c
> - copied, changed from r238366, head/sys/kern/dtio_kdtrace.c
> stable/9/sys/modules/dtrace/dtio/
> - copied from r238366, head/sys/modules/dtrace/dtio/
> Modified:
> stable/9/cddl/lib/libdtrace/Makefile
> stable/9/sys/kern/subr_devstat.c
> stable/9/sys/modules/dtrace/Makefile
> stable/9/sys/modules/dtrace/dtraceall/dtraceall.c
> stable/9/sys/sys/dtrace_bsd.h
> Directory Properties:
> stable/9/cddl/lib/libdtrace/ (props changed)
> stable/9/sys/ (props changed)
> stable/9/sys/amd64/include/xen/ (props changed)
> stable/9/sys/boot/ (props changed)
> stable/9/sys/boot/i386/efi/ (props changed)
> stable/9/sys/boot/ia64/efi/ (props changed)
> stable/9/sys/boot/ia64/ski/ (props changed)
> stable/9/sys/boot/powerpc/boot1.chrp/ (props changed)
> stable/9/sys/boot/powerpc/ofw/ (props changed)
> stable/9/sys/cddl/contrib/opensolaris/ (props changed)
> stable/9/sys/conf/ (props changed)
> stable/9/sys/contrib/dev/acpica/ (props changed)
> stable/9/sys/contrib/octeon-sdk/ (props changed)
> stable/9/sys/contrib/pf/ (props changed)
> stable/9/sys/contrib/x86emu/ (props changed)
> stable/9/sys/dev/ (props changed)
> stable/9/sys/dev/e1000/ (props changed)
> stable/9/sys/dev/isp/ (props changed)
> stable/9/sys/dev/ixgbe/ (props changed)
> stable/9/sys/dev/puc/ (props changed)
> stable/9/sys/fs/ (props changed)
> stable/9/sys/fs/ntfs/ (props changed)
> stable/9/sys/modules/ (props changed)
>
> Modified: stable/9/cddl/lib/libdtrace/Makefile
> ==============================================================================
> --- stable/9/cddl/lib/libdtrace/Makefile Fri Dec 7 16:26:32 2012 (r243988)
> +++ stable/9/cddl/lib/libdtrace/Makefile Fri Dec 7 19:06:40 2012 (r243989)
> @@ -46,6 +46,7 @@ SRCS= dt_aggregate.c \
> dis_tables.c
>
> DSRCS= errno.d \
> + io.d \
> psinfo.d \
> signal.d \
> unistd.d
>
> Copied and modified: stable/9/cddl/lib/libdtrace/io.d (from r236628, head/cddl/lib/libdtrace/io.d)
> ==============================================================================
> --- head/cddl/lib/libdtrace/io.d Tue Jun 5 18:58:05 2012 (r236628, copy source)
> +++ stable/9/cddl/lib/libdtrace/io.d Fri Dec 7 19:06:40 2012 (r243989)
> @@ -27,114 +27,50 @@
>
> #pragma ident "%Z%%M% %I% %E% SMI"
>
> -#pragma D depends_on module unix
> #pragma D depends_on provider io
>
> -inline int B_BUSY = B_BUSY;
> -#pragma D binding "1.0" B_BUSY
> -inline int B_DONE = 0x00000200;
> -#pragma D binding "1.0" B_DONE
> -inline int B_ERROR = B_ERROR;
> -#pragma D binding "1.0" B_ERROR
> -inline int B_PAGEIO = B_PAGEIO;
> -#pragma D binding "1.0" B_PAGEIO
> -inline int B_PHYS = B_PHYS;
> -#pragma D binding "1.0" B_PHYS
> -inline int B_READ = B_READ;
> -#pragma D binding "1.0" B_READ
> -inline int B_WRITE = B_WRITE;
> -#pragma D binding "1.0" B_WRITE
> -inline int B_ASYNC = 0x00000004;
> -#pragma D binding "1.0" B_ASYNC
> -
> -typedef struct bufinfo {
> - int b_flags; /* buffer status */
> - size_t b_bcount; /* number of bytes */
> - caddr_t b_addr; /* buffer address */
> - uint64_t b_lblkno; /* block # on device */
> - uint64_t b_blkno; /* expanded block # on device */
> - size_t b_resid; /* # of bytes not transferred */
> - size_t b_bufsize; /* size of allocated buffer */
> - caddr_t b_iodone; /* I/O completion routine */
> - int b_error; /* expanded error field */
> - dev_t b_edev; /* extended device */
> -} bufinfo_t;
> -
> -#pragma D binding "1.0" translator
> -translator bufinfo_t < struct buf *B > {
> - b_flags = B->b_flags;
> - b_addr = B->b_un.b_addr;
> - b_bcount = B->b_bcount;
> - b_lblkno = B->_b_blkno._f;
> - b_blkno = sizeof (long) == 8 ? B->_b_blkno._f : B->_b_blkno._p._l;
> - b_resid = B->b_resid;
> - b_bufsize = B->b_bufsize;
> - b_iodone = (caddr_t)B->b_iodone;
> - b_error = B->b_error;
> - b_edev = B->b_edev;
> -};
> -
> typedef struct devinfo {
> - int dev_major; /* major number */
> - int dev_minor; /* minor number */
> - int dev_instance; /* instance number */
> - string dev_name; /* name of device */
> - string dev_statname; /* name of device + instance/minor */
> - string dev_pathname; /* pathname of device */
> + int dev_major; /* major number */
> + int dev_minor; /* minor number */
> + int dev_instance; /* instance number */
> + string dev_name; /* name of device */
> + string dev_statname; /* name of device + instance/minor */
> + string dev_pathname; /* pathname of device */
> } devinfo_t;
>
> #pragma D binding "1.0" translator
> -translator devinfo_t < struct buf *B > {
> - dev_major = B->b_dip != NULL ? getmajor(B->b_edev) :
> - getmajor(B->b_file->v_vfsp->vfs_dev);
> - dev_minor = B->b_dip != NULL ? getminor(B->b_edev) :
> - getminor(B->b_file->v_vfsp->vfs_dev);
> - dev_instance = B->b_dip == NULL ?
> - getminor(B->b_file->v_vfsp->vfs_dev) :
> - ((struct dev_info *)B->b_dip)->devi_instance;
> - dev_name = B->b_dip == NULL ? "nfs" :
> - stringof(`devnamesp[getmajor(B->b_edev)].dn_name);
> - dev_statname = strjoin(B->b_dip == NULL ? "nfs" :
> - stringof(`devnamesp[getmajor(B->b_edev)].dn_name),
> - lltostr(B->b_dip == NULL ? getminor(B->b_file->v_vfsp->vfs_dev) :
> - ((struct dev_info *)B->b_dip)->devi_instance == 0 &&
> - ((struct dev_info *)B->b_dip)->devi_parent != NULL &&
> - ((struct dev_info *)B->b_dip)->devi_parent->devi_node_name ==
> - "pseudo" ? getminor(B->b_edev) :
> - ((struct dev_info *)B->b_dip)->devi_instance));
> - dev_pathname = B->b_dip == NULL ? "<nfs>" :
> - ddi_pathname(B->b_dip, getminor(B->b_edev));
> +translator devinfo_t < struct devstat *D > {
> + dev_major = D->device_number;
> + dev_minor = D->unit_number;
> + dev_instance = 0;
> + dev_name = stringof(D->device_name);
> + dev_statname = stringof(D->device_name);
> + dev_pathname = stringof(D->device_name);
> };
>
> -typedef struct fileinfo {
> - string fi_name; /* name (basename of fi_pathname) */
> - string fi_dirname; /* directory (dirname of fi_pathname) */
> - string fi_pathname; /* full pathname */
> - offset_t fi_offset; /* offset within file */
> - string fi_fs; /* filesystem */
> - string fi_mount; /* mount point of file system */
> - int fi_oflags; /* open(2) flags for file descriptor */
> -} fileinfo_t;
> +typedef struct bufinfo {
> + int b_flags; /* flags */
> + long b_bcount; /* number of bytes */
> + caddr_t b_addr; /* buffer address */
> + uint64_t b_blkno; /* expanded block # on device */
> + uint64_t b_lblkno; /* block # on device */
> + size_t b_resid; /* # of bytes not transferred */
> + size_t b_bufsize; /* size of allocated buffer */
> +/* caddr_t b_iodone; I/O completion routine */
> + int b_error; /* expanded error field */
> +/* dev_t b_edev; extended device */
> +} bufinfo_t;
>
> #pragma D binding "1.0" translator
> -translator fileinfo_t < struct buf *B > {
> - fi_name = B->b_file == NULL ? "<none>" :
> - B->b_file->v_path == NULL ? "<unknown>" :
> - basename(cleanpath(B->b_file->v_path));
> - fi_dirname = B->b_file == NULL ? "<none>" :
> - B->b_file->v_path == NULL ? "<unknown>" :
> - dirname(cleanpath(B->b_file->v_path));
> - fi_pathname = B->b_file == NULL ? "<none>" :
> - B->b_file->v_path == NULL ? "<unknown>" :
> - cleanpath(B->b_file->v_path);
> - fi_offset = B->b_offset;
> - fi_fs = B->b_file == NULL ? "<none>" :
> - stringof(B->b_file->v_op->vnop_name);
> - fi_mount = B->b_file == NULL ? "<none>" :
> - B->b_file->v_vfsp->vfs_vnodecovered == NULL ? "/" :
> - B->b_file->v_vfsp->vfs_vnodecovered->v_path == NULL ? "<unknown>" :
> - cleanpath(B->b_file->v_vfsp->vfs_vnodecovered->v_path);
> - fi_oflags = 0;
> +translator bufinfo_t < struct bio *B > {
> + b_flags = B->bio_flags;
> + b_bcount = B->bio_bcount;
> + b_addr = B->bio_data;
> + b_blkno = 0;
> + b_lblkno = 0;
> + b_resid = B->bio_resid;
> + b_bufsize = 0; /* XXX gnn */
> + b_error = B->bio_error;
> };
>
> /*
> @@ -158,63 +94,17 @@ inline int O_APPEND = 0x0008;
> #pragma D binding "1.1" O_APPEND
> inline int O_CREAT = 0x0200;
> #pragma D binding "1.1" O_CREAT
> -inline int O_DSYNC = O_DSYNC;
> -#pragma D binding "1.1" O_DSYNC
> inline int O_EXCL = 0x0800;
> #pragma D binding "1.1" O_EXCL
> -inline int O_LARGEFILE = O_LARGEFILE;
> -#pragma D binding "1.1" O_LARGEFILE
> inline int O_NOCTTY = 0x8000;
> #pragma D binding "1.1" O_NOCTTY
> inline int O_NONBLOCK = 0x0004;
> #pragma D binding "1.1" O_NONBLOCK
> inline int O_NDELAY = 0x0004;
> #pragma D binding "1.1" O_NDELAY
> -inline int O_RSYNC = O_RSYNC;
> -#pragma D binding "1.1" O_RSYNC
> inline int O_SYNC = 0x0080;
> #pragma D binding "1.1" O_SYNC
> inline int O_TRUNC = 0x0400;
> #pragma D binding "1.1" O_TRUNC
> -inline int O_XATTR = O_XATTR;
> -#pragma D binding "1.1" O_XATTR
>
> -#pragma D binding "1.1" translator
> -translator fileinfo_t < struct file *F > {
> - fi_name = F == NULL ? "<none>" :
> - F->f_vnode->v_path == NULL ? "<unknown>" :
> - basename(cleanpath(F->f_vnode->v_path));
> - fi_dirname = F == NULL ? "<none>" :
> - F->f_vnode->v_path == NULL ? "<unknown>" :
> - dirname(cleanpath(F->f_vnode->v_path));
> - fi_pathname = F == NULL ? "<none>" :
> - F->f_vnode->v_path == NULL ? "<unknown>" :
> - cleanpath(F->f_vnode->v_path);
> - fi_offset = F == NULL ? 0 : F->f_offset;
> - fi_fs = F == NULL ? "<none>" : stringof(F->f_vnode->v_op->vnop_name);
> - fi_mount = F == NULL ? "<none>" :
> - F->f_vnode->v_vfsp->vfs_vnodecovered == NULL ? "/" :
> - F->f_vnode->v_vfsp->vfs_vnodecovered->v_path == NULL ? "<unknown>" :
> - cleanpath(F->f_vnode->v_vfsp->vfs_vnodecovered->v_path);
> - fi_oflags = F == NULL ? 0 : F->f_flag + (int)FOPEN;
> -};
>
> -inline fileinfo_t fds[int fd] = xlate <fileinfo_t> (
> - fd >= 0 && fd < curthread->t_procp->p_user.u_finfo.fi_nfiles ?
> - curthread->t_procp->p_user.u_finfo.fi_list[fd].uf_file : NULL);
> -
> -#pragma D attributes Stable/Stable/Common fds
> -#pragma D binding "1.1" fds
> -
> -#pragma D binding "1.2" translator
> -translator fileinfo_t < struct vnode *V > {
> - fi_name = V->v_path == NULL ? "<unknown>" :
> - basename(cleanpath(V->v_path));
> - fi_dirname = V->v_path == NULL ? "<unknown>" :
> - dirname(cleanpath(V->v_path));
> - fi_pathname = V->v_path == NULL ? "<unknown>" : cleanpath(V->v_path);
> - fi_fs = stringof(V->v_op->vnop_name);
> - fi_mount = V->v_vfsp->vfs_vnodecovered == NULL ? "/" :
> - V->v_vfsp->vfs_vnodecovered->v_path == NULL ? "<unknown>" :
> - cleanpath(V->v_vfsp->vfs_vnodecovered->v_path);
> -};
>
> Copied and modified: stable/9/sys/kern/dtio_kdtrace.c (from r238366, head/sys/kern/dtio_kdtrace.c)
> ==============================================================================
> --- head/sys/kern/dtio_kdtrace.c Wed Jul 11 16:27:02 2012 (r238366, copy source)
> +++ stable/9/sys/kern/dtio_kdtrace.c Fri Dec 7 19:06:40 2012 (r243989)
> @@ -56,7 +56,7 @@ static dtrace_pattr_t dtio_attr = {
> { DTRACE_STABILITY_STABLE, DTRACE_STABILITY_STABLE, DTRACE_CLASS_COMMON },
> };
>
> -static char *genunix = "genunix";
> +static char *kernel = "kernel";
>
> /*
> * Name strings.
> @@ -113,25 +113,25 @@ dtio_provide(void *arg, dtrace_probedesc
> if (desc != NULL)
> return;
>
> - if (dtrace_probe_lookup(dtio_id, genunix, NULL,
> + if (dtrace_probe_lookup(dtio_id, kernel, NULL,
> dtio_start_str) == 0) {
> - dtio_start_id = dtrace_probe_create(dtio_id, genunix, NULL,
> + dtio_start_id = dtrace_probe_create(dtio_id, kernel, NULL,
> dtio_start_str, 0, NULL);
> }
> - if (dtrace_probe_lookup(dtio_id, genunix, NULL, dtio_done_str) == 0) {
> - dtio_done_id = dtrace_probe_create(dtio_id, genunix, NULL,
> + if (dtrace_probe_lookup(dtio_id, kernel, NULL, dtio_done_str) == 0) {
> + dtio_done_id = dtrace_probe_create(dtio_id, kernel, NULL,
> dtio_done_str, 0, NULL);
> }
> - if (dtrace_probe_lookup(dtio_id, genunix, NULL,
> + if (dtrace_probe_lookup(dtio_id, kernel, NULL,
> dtio_wait_start_str) == 0) {
> - dtio_wait_start_id = dtrace_probe_create(dtio_id, genunix,
> + dtio_wait_start_id = dtrace_probe_create(dtio_id, kernel,
> NULL,
> dtio_wait_start_str,
> 0, NULL);
> }
> - if (dtrace_probe_lookup(dtio_id, genunix, NULL,
> + if (dtrace_probe_lookup(dtio_id, kernel, NULL,
> dtio_wait_done_str) == 0) {
> - dtio_wait_done_id = dtrace_probe_create(dtio_id, genunix, NULL,
> + dtio_wait_done_id = dtrace_probe_create(dtio_id, kernel, NULL,
> dtio_wait_done_str, 0, NULL);
> }
>
>
> Modified: stable/9/sys/kern/subr_devstat.c
> ==============================================================================
> --- stable/9/sys/kern/subr_devstat.c Fri Dec 7 16:26:32 2012 (r243988)
> +++ stable/9/sys/kern/subr_devstat.c Fri Dec 7 19:06:40 2012 (r243989)
> @@ -29,6 +29,8 @@
> #include <sys/cdefs.h>
> __FBSDID("$FreeBSD$");
>
> +#include "opt_kdtrace.h"
> +
> #include <sys/param.h>
> #include <sys/kernel.h>
> #include <sys/systm.h>
> @@ -44,6 +46,54 @@ __FBSDID("$FreeBSD$");
>
> #include <machine/atomic.h>
>
> +#ifdef KDTRACE_HOOKS
> +#include <sys/dtrace_bsd.h>
> +
> +dtrace_io_start_probe_func_t dtrace_io_start_probe;
> +dtrace_io_done_probe_func_t dtrace_io_done_probe;
> +dtrace_io_wait_start_probe_func_t dtrace_io_wait_start_probe;
> +dtrace_io_wait_done_probe_func_t dtrace_io_wait_done_probe;
> +
> +uint32_t dtio_start_id;
> +uint32_t dtio_done_id;
> +uint32_t dtio_wait_start_id;
> +uint32_t dtio_wait_done_id;
> +
> +#define DTRACE_DEVSTAT_START() \
> + if (dtrace_io_start_probe != NULL) \
> + (*dtrace_io_start_probe)(dtio_start_id, NULL, ds);
> +
> +#define DTRACE_DEVSTAT_BIO_START() \
> + if (dtrace_io_start_probe != NULL) \
> + (*dtrace_io_start_probe)(dtio_start_id, bp, ds);
> +
> +#define DTRACE_DEVSTAT_DONE() \
> + if (dtrace_io_done_probe != NULL) \
> + (*dtrace_io_done_probe)(dtio_done_id, NULL, ds);
> +
> +#define DTRACE_DEVSTAT_BIO_DONE() \
> + if (dtrace_io_done_probe != NULL) \
> + (*dtrace_io_done_probe)(dtio_done_id, bp, ds);
> +
> +#define DTRACE_DEVSTAT_WAIT_START() \
> + if (dtrace_io_wait_start_probe != NULL) \
> + (*dtrace_io_wait_start_probe)(dtio_wait_start_id, NULL, ds);
> +
> +#define DTRACE_DEVSTAT_WAIT_DONE() \
> + if (dtrace_io_wait_done_probe != NULL) \
> + (*dtrace_io_wait_done_probe)(dtio_wait_done_id, NULL, ds);
> +
> +#else /* ! KDTRACE_HOOKS */
> +
> +#define DTRACE_DEVSTAT_START()
> +
> +#define DTRACE_DEVSTAT_DONE()
> +
> +#define DTRACE_DEVSTAT_WAIT_START()
> +
> +#define DTRACE_DEVSTAT_WAIT_DONE()
> +#endif /* KDTRACE_HOOKS */
> +
> static int devstat_num_devs;
> static long devstat_generation = 1;
> static int devstat_version = DEVSTAT_VERSION;
> @@ -227,6 +277,7 @@ devstat_start_transaction(struct devstat
> }
> ds->start_count++;
> atomic_add_rel_int(&ds->sequence0, 1);
> + DTRACE_DEVSTAT_START();
> }
>
> void
> @@ -241,6 +292,7 @@ devstat_start_transaction_bio(struct dev
>
> binuptime(&bp->bio_t0);
> devstat_start_transaction(ds, &bp->bio_t0);
> + DTRACE_DEVSTAT_BIO_START();
> }
>
> /*
> @@ -312,6 +364,7 @@ devstat_end_transaction(struct devstat *
>
> ds->end_count++;
> atomic_add_rel_int(&ds->sequence0, 1);
> + DTRACE_DEVSTAT_DONE();
> }
>
> void
> @@ -334,6 +387,7 @@ devstat_end_transaction_bio(struct devst
>
> devstat_end_transaction(ds, bp->bio_bcount - bp->bio_resid,
> DEVSTAT_TAG_SIMPLE, flg, NULL, &bp->bio_t0);
> + DTRACE_DEVSTAT_BIO_DONE();
> }
>
> /*
>
> Modified: stable/9/sys/modules/dtrace/Makefile
> ==============================================================================
> --- stable/9/sys/modules/dtrace/Makefile Fri Dec 7 16:26:32 2012 (r243988)
> +++ stable/9/sys/modules/dtrace/Makefile Fri Dec 7 19:06:40 2012 (r243989)
> @@ -11,6 +11,7 @@ SUBDIR= dtmalloc \
> dtrace_test \
> lockstat \
> profile \
> + dtio \
> prototype \
> sdt \
> systrace
>
> Modified: stable/9/sys/modules/dtrace/dtraceall/dtraceall.c
> ==============================================================================
> --- stable/9/sys/modules/dtrace/dtraceall/dtraceall.c Fri Dec 7 16:26:32 2012 (r243988)
> +++ stable/9/sys/modules/dtrace/dtraceall/dtraceall.c Fri Dec 7 19:06:40 2012 (r243989)
> @@ -65,6 +65,7 @@ MODULE_VERSION(dtraceall, 1);
> MODULE_DEPEND(dtraceall, cyclic, 1, 1, 1);
> MODULE_DEPEND(dtraceall, opensolaris, 1, 1, 1);
> MODULE_DEPEND(dtraceall, dtrace, 1, 1, 1);
> +MODULE_DEPEND(dtraceall, dtio, 1, 1, 1);
> MODULE_DEPEND(dtraceall, dtmalloc, 1, 1, 1);
> MODULE_DEPEND(dtraceall, dtnfscl, 1, 1, 1);
> MODULE_DEPEND(dtraceall, dtnfsclient, 1, 1, 1);
>
> Modified: stable/9/sys/sys/dtrace_bsd.h
> ==============================================================================
> --- stable/9/sys/sys/dtrace_bsd.h Fri Dec 7 16:26:32 2012 (r243988)
> +++ stable/9/sys/sys/dtrace_bsd.h Fri Dec 7 19:06:40 2012 (r243989)
> @@ -38,6 +38,8 @@ struct thread;
> struct vattr;
> struct vnode;
> struct reg;
> +struct devstat;
> +struct bio;
>
> /*
> * Cyclic clock function type definition used to hook the cyclic
> @@ -168,6 +170,23 @@ extern dtrace_nfsclient_nfs23_done_probe
> extern dtrace_nfsclient_nfs23_done_probe_func_t
> dtrace_nfscl_nfs234_done_probe;
>
> +/* IO Provider hooks, really hook into devstat */
> +typedef void (*dtrace_io_start_probe_func_t)(uint32_t, struct bio *,
> + struct devstat *);
> +extern dtrace_io_start_probe_func_t dtrace_io_start_probe;
> +
> +typedef void (*dtrace_io_done_probe_func_t)(uint32_t, struct bio *,
> + struct devstat *);
> +extern dtrace_io_done_probe_func_t dtrace_io_done_probe;
> +
> +typedef void (*dtrace_io_wait_start_probe_func_t)(uint32_t, uintptr_t *,
> + struct devstat *);
> +extern dtrace_io_wait_start_probe_func_t dtrace_io_wait_start_probe;
> +
> +typedef void (*dtrace_io_wait_done_probe_func_t)(uint32_t, uintptr_t *,
> + struct devstat *);
> +extern dtrace_io_wait_done_probe_func_t dtrace_io_wait_done_probe;
> +
> /*
> * Functions which allow the dtrace module to check that the kernel
> * hooks have been compiled with sufficient space for it's private
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