Hi Cni,
Your script is not operating the way you intended, but DTrace is
functioning properly. The fbt return probes are firing before the
syscall return probes and thus setting self->time to 0 so that when
the syscall return probe fires the predicate evaluates to false.
You don't seem to be doing any computation with self->time. If you're
just trying to count the number of times the functions you've listed
fire, you can just do this:
fbt:ipc::entry,
fbt:semsys::entry,
fbt:genunix:sem*:entry,
syscall::sem*:entry
{
this->name = strjoin(probeprov, strjoin(strjoin(":", probemod),
strjoin(":", probefunc)));
@semcheck[this->name] = count();
}
Adam
On Fri, Aug 26, 2011 at 1:17 AM, Juhasz Balint <cni...@gmail.com> wrote:
> Hy!
>
>
> I think i find some interesting problem (maybe it is basic :) ):
> root@thelab ~/Tools/IPC$ ./ipc_count_syscall.d
>
> syscall::semsys 1690
> root@thelab ~/Tools/IPC$ cat ./ipc_count_syscall.d
> #!/usr/sbin/dtrace -qs
>
> #pragma D option quiet
> #pragma D option destructive
>
> syscall::sem*:entry
> {
> self->time = timestamp;
> }
>
> syscall::sem*:return
> /self->time/
> {
> this->name = strjoin(probeprov, strjoin("::",probefunc));
> @semcheck[this->name] = count();
> self->time = 0;
> }
>
> tick-10sec
> {
> exit(0);
> }
>
> It's ok, but if i put fbt provider checking to this script, i can't
> see syscall fields in the count() result:
>
> root@thelab ~/Tools/IPC$ ./ipc_count_all.d
>
> fbt:genunix:sema_destroy 4
> fbt:genunix:sema_init 8
> fbt:genunix:sema_tryp 81
> fbt:genunix:sema_p 208
> fbt:genunix:sema_v 289
> fbt:ipc:ipc_lock_internal 1850
> fbt:ipc:ipcperm_access 1850
> fbt:semsys:sem_undo_add 1850
> fbt:semsys:sem_undo_compar 1850
> fbt:semsys:semsys 1850
> root@thelab ~/Tools/IPC$ cat ./ipc_count_all.d
> #!/usr/sbin/dtrace -qs
>
> #pragma D option quiet
> #pragma D option destructive
>
> fbt:ipc::entry,
> fbt:semsys::entry,
> fbt:genunix:sem*:entry,
> syscall::sem*:entry
> {
> self->time = timestamp;
> }
>
> fbt:ipc::return,
> fbt:semsys::return,
> fbt:genunix:sem*:return
> /self->time/
> {
> this->name = strjoin(probeprov,
> strjoin(strjoin(":",probemod),strjoin(":",probefunc)));
> @semcheck[this->name] = count();
> self->time = 0;
> }
>
> syscall::sem*:return
> /self->time/
> {
> this->name = strjoin(probeprov, strjoin("::",probefunc));
> @semcheck[this->name] = count();
> self->time = 0;
> }
>
> tick-10sec
> {
> exit(0);
> }
>
> If i modify the script, it also not working.
>
> root@thelab ~/Tools/IPC$ ./ipc_count_all.d
>
> fbt:genunix:sema_tryp 1
> fbt:genunix:sema_destroy 4
> fbt:genunix:sema_init 14
> fbt:genunix:sema_p 59
> fbt:genunix:sema_v 60
> fbt:ipc:ipc_lock_internal 1850
> fbt:ipc:ipcperm_access 1850
> fbt:semsys:sem_undo_add 1850
> fbt:semsys:sem_undo_compar 1850
> fbt:semsys:semsys 1850
> root@thelab ~/Tools/IPC$ cat ./ipc_count_all.d
> #!/usr/sbin/dtrace -qs
>
> #pragma D option quiet
> #pragma D option destructive
>
> fbt:ipc::entry,
> fbt:semsys::entry,
> fbt:genunix:sem*:entry,
> syscall::sem*:entry
> {
> self->time = timestamp;
> }
>
> fbt:ipc::return,
> fbt:semsys::return,
> fbt:genunix:sem*:return,
> syscall::sem*:return
> /self->time/
> {
> this->name = strjoin(probeprov,
> strjoin(strjoin(":",probemod),strjoin(":",probefunc)));
> @semcheck[this->name] = count();
> self->time = 0;
> }
>
> tick-10sec
> {
> exit(0);
> }
>
> I know i can use printa to print probeprov, probemod and probefunc but
> i prefer strjoin :)
> In this case i doesn't understand where are syscall' count.
>
> Anyone has an idea about this problem?
>
> Cni
> _______________________________________________
> dtrace-discuss mailing list
> dtrace-discuss@opensolaris.org
>
--
Adam Leventhal, Delphix
http://dtrace.org/blogs/ahl
275 Middlefield Road, Suite 50
Menlo Park, CA 94025
http://www.delphix.com
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