zvol latency

Hi,

I used to run zfsslower.d (dtrace is below) to get latency from ZFS FileSystem perspective.

Is there any way to get the latency when we are working with zvol (raw device) ?

Regards, Rafael.

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#!/usr/sbin/dtrace -s

#pragma D option quiet
#pragma D option defaultargs
#pragma D option switchrate=10hz

dtrace:::BEGIN
{
        printf("%-20s %-16s %1s %4s %6s %s\n", "TIME", "PROCESS",
            "D", "KB", "ms", "FILE");
        min_ns = $1 * 1000000;
}

/* see uts/common/fs/zfs/zfs_vnops.c */

fbt::zfs_read:entry,
fbt::zfs_write:entry
{
        self->path = args[0]->v_path;
        self->kb = args[1]->uio_resid / 1024;