> What sayeth the ZFS team regarding the use of a stable DTrace provider
> with their file system?
>
For the record, the above has a tone to it that I really did not intend
(antagonistic?), so....
I had a good chat with Roch about this. The file pathname is derived via
a translator
from the vnode v_path structure member, and thus requires an
instantiated vnode
when the probe fires - this is why instrumenting bdev_strategy:entry and
tracing
args[0]->b_vp->v_path has the same problem; no vnode.
An alternative approach to tracking filenames with IOs is using the
fsinfo provider
(Solaris 10 Update 2) . This is a handy place to start:
#!/usr/sbin/dtrace -s
#pragma D option quiet
fsinfo:::
/ execname != "dtrace" /
{
@[execname, args[0]->fi_pathname, args[0]->fi_fs, probename] =
count();
}
END
{
printf("%-16s %-24s %-8s %-16s
%-8s\n","EXEC","PATH","FS","NAME","COUNT");
printa("%-16s %-24s %-8s %-16s [EMAIL PROTECTED]",@);
}
Which yields...
EXEC PATH FS NAME COUNT
gnome-panel /zp ufs lookup 1
gnome-panel /zp/home zfs lookup 1
gnome-panel /zp/home/mauroj zfs lookup 1
gnome-panel /zp/home/mauroj/.recently-used.xbel.HKF3YT zfs
getattr 1
gnome-panel /zp/home/mauroj/.recently-used.xbel.HKF3YT zfs
lookup 1
<snip>
metacity <unknown> sockfs poll 1031
vmware-user <unknown> sockfs poll 1212
Xorg <unknown> sockfs rwlock 1573
Xorg <unknown> sockfs rwunlock 1573
gnome-terminal <unknown> sockfs poll 2084
dbwriter /zp/space zfs realvp 4254
dbwriter /zp/space zfs remove 4254
dbwriter /zp/space/f33 zfs close 4254
dbwriter /zp/space/f33 zfs lookup 4254
dbwriter /zp/space/f33 zfs read 4254
dbwriter /zp/space/f33 zfs realvp 4254
dbwriter /zp/space/f33 zfs seek 4254
dbwriter /zp/space/f33 zfs write 4254
dbwriter /zp/space zfs getsecattr 4255
dbwriter /zp/space/f33 zfs ioctl 4255
dbwriter /zp/space/f33 zfs open 4255
dbwriter <unknown> zfs create 4255
dbwriter /zp/space/f33 zfs rwunlock 8508
dbwriter /zp/space zfs lookup 8509
dbwriter /zp/space/f33 zfs rwlock 8509
dbwriter /zp ufs lookup 8515
Thanks,
/jim
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