If you’ve seen one of my talks on ZFS Tuning you’ve witnessed my love for the fsinfo provider (and the fsstat command as well) first hand. This amazing but poorly documented provider can give you some great high level insight into your I/O pattern. If you’ve ever used truss just to watch iops, then give this a whirl instead.
There are probes for each VFS operation:
ID PROVIDER MODULE FUNCTION NAME 14937 fsinfo genunix fop_vnevent vnevent 14938 fsinfo genunix fop_shrlock shrlock 14939 fsinfo genunix fop_getsecattr getsecattr 14940 fsinfo genunix fop_setsecattr setsecattr 14941 fsinfo genunix fop_dispose dispose 14942 fsinfo genunix fop_dumpctl dumpctl 14943 fsinfo genunix fop_pageio pageio 14944 fsinfo genunix fop_pathconf pathconf 14945 fsinfo genunix fop_dump dump 14946 fsinfo genunix fop_poll poll 14947 fsinfo genunix fop_delmap delmap 14948 fsinfo genunix fop_addmap addmap 14949 fsinfo genunix fop_map map 14950 fsinfo genunix fop_putpage putpage 14951 fsinfo genunix fop_getpage getpage 14952 fsinfo genunix fop_realvp realvp 14953 fsinfo genunix fop_space space 14954 fsinfo genunix fop_frlock frlock 14955 fsinfo genunix fop_cmp cmp 14956 fsinfo genunix fop_seek seek 14957 fsinfo genunix fop_rwunlock rwunlock 14958 fsinfo genunix fop_rwlock rwlock 14959 fsinfo genunix fop_fid fid 14960 fsinfo genunix fop_inactive inactive 14961 fsinfo genunix fop_fsync fsync 14962 fsinfo genunix fop_readlink readlink 14963 fsinfo genunix fop_symlink symlink 14964 fsinfo genunix fop_readdir readdir 14965 fsinfo genunix fop_rmdir rmdir 14966 fsinfo genunix fop_mkdir mkdir 14967 fsinfo genunix fop_rename rename 14968 fsinfo genunix fop_link link 14969 fsinfo genunix fop_remove remove 14970 fsinfo genunix fop_create create 14971 fsinfo genunix fop_lookup lookup 14972 fsinfo genunix fop_access access 14973 fsinfo genunix fop_setattr setattr 14974 fsinfo genunix fop_getattr getattr 14975 fsinfo genunix fop_setfl setfl 14976 fsinfo genunix fop_ioctl ioctl 14977 fsinfo genunix fop_write write 14978 fsinfo genunix fop_read read 14979 fsinfo genunix fop_close close 14980 fsinfo genunix fop_open open
- The arguments to the probes are:
- args[0]: fileinfo_t *
- args[1]: Return value (0 for success, in the case of writes this is the write size in bytes (ssize_t)).
So lets look at the most generic script we could write:
#pragma D option quiet
fsinfo:genunix::
{
printf("%s (%s) %s: %d [%s]n", probename, execname, args[0]->fi_pathname, args[1], args[0]->fi_fs);
}
The output specifies the probename (operation), process name that generated the op, the pathname if applicable, the return value, and finally the filesystem type:
$ dtrace -s fsinfo.d lookup (idmapd) /etc: 0 [ufs] lookup (idmapd) /etc/resolv.conf: 0 [ufs] getattr (idmapd) /etc/resolv.conf: 0 [ufs] poll (idmapd) <unknown>: 0 [sockfs] poll (idmapd) <unknown>: 0 [sockfs] poll (idmapd) <unknown>: 0 [sockfs] ... close (mysqld) /local/zone/root/var/tmp/#sql_47d3_0.MYI: 0 [zfs] close (mysqld) /local/zone/root/var/tmp/#sql_47d3_0.MYD: 0 [zfs] lookup (mysqld) /local/zone/root/var: 0 [zfs] lookup (mysqld) /local/zone/root/var/tmp: 0 [zfs] ...
This can quickly be jazzed up by adding a conditional by zonename or filesystem type or process. We could do some aggregations rather than the play-by-play.
While the fsstat command can give you per-operation counts by mount, this gives you a lot more data which in turn can be used to find unusual I/O’s that you didn’t expect or help you construct realistic benchmarks using tools like FileBench.
From which version is fsinfo available?
> # dtrace -s fsinfo.d
> dtrace: failed to compile script fsinfo.d: line 3: probe description
> fsinfo:genunix:: does not match any probes
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