You could first filter out the target file system for the file IO by
doing a count() aggregation on;
[fds[arg0].fi_fs] = count();
NOTE - this will only work for those system calls that take a file
descriptor as arg0.
Once you know the FS target for the file IO (ufs? zfs? whatever), use it
in a predicate to capture systems calls of interest;
/ fds[arg0].fi_fs == "ufs" /
(for example - replace "ufs" with whatever came up in the previous
result.
And, again, this will only work for the system calls that take a
file descriptor as arg0.
HTH
/jim
On Jul 13, 2010, at 7:10 AM, Ralph Böhme wrote:
> Dtracers,
>
> I'm investigating some performance issues using a simple dtrace script which
> collects read,write,stat,... syscall data. This works fine and gives me some
> good data.
> Unfortunately the app I'm tracing is concurrently doing file IO and IO on a
> UNIX domain socket. As I'm only interested in data for file IO, I'm
> investigating how I can modify my syscall probes. I'm currenty doing stuff
> like this:
>
> /*
> * Save syscall entry info
> */
> syscall::*stat*:entry,
> syscall::*open*:entry,
> syscall::*read*:entry,
> syscall::*write*:entry,
> syscall::getdents*:entry,
> syscall::*sync*:entry
> /((OPT_command || OPT_pid) && pid == $target) || (OPT_name && execname ==
> NAME)/
> {
> /* set start details */
> self->start = timestamp;
> self->vstart = vtimestamp;
> }
>
> /*
> * Print return data
> */
>
> syscall::*stat*:return,
> syscall::*open*:return,
> syscall::*read*:return,
> syscall::*write*:return,
> syscall::getdents*:return,
> syscall::*sync*:return
> /self->start/
> {
> /* calculate elapsed time */
> this->elapsed = (timestamp - self->start) / 1000;
> self->start = 0;
> this->cpu = (vtimestamp - self->vstart) / 1000;
> self->vstart = 0;
>
> @count[probefunc] = count();
> @sum[probefunc] = sum(this->elapsed);
> @elapsed[probefunc] = quantize(this->elapsed);
> @oncpu[probefunc] = quantize(this->cpu);
> @avg[probefunc] = avg(this->elapsed);
>
> }
>
> Any hint for me? Thanks!
> -Ralph
> --
> This message posted from opensolaris.org
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