Hy!
In the script i used self->time = timestamp because in that version i
used @semcheck[this->name] = quantize(timestamp - self->time);.
After the letters i thinking and checking, there are syscall if i
check only entry:
root@thelab ~/Tools/IPC$ ./ipc_count_entry.d
fbt:ipc:ipcs_lock 2
fbt:ipc:ipcs_unlock 2
fbt:ipc:ipc_lock 4
fbt:ipc:ipc_commit_begin 5
fbt:ipc:ipc_commit_end 5
fbt:ipc:ipc_get 5
fbt:ipc:ipc_remove 5
fbt:ipc:ipc_rmid 5
fbt:ipc:ipcperm_stat64 5
fbt:ipc:ipc_rele 9
fbt:ipc:ipc_alloc_test 10
fbt:ipc:ipc_hold 10
fbt:genunix:sema_tryp 107
fbt:genunix:sema_p 110
fbt:genunix:sema_destroy 160
fbt:genunix:sema_init 160
fbt:genunix:sema_v 217
fbt:semsys:sem_undo_add 1416
fbt:semsys:sem_undo_compar 1416
fbt:semsys:semop 1416
fbt:semsys:semsys 1416
syscall::semsys 1416
fbt:ipc:ipc_lookup 1436
fbt:ipc:ipcperm_access 1436
fbt:ipc:ipc_lock_internal 1440
root@thelab ~/Tools/IPC$ cat ./ipc_count_entry.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
{
this->name = strjoin(probeprov,
strjoin(strjoin(":",probemod),strjoin(":",probefunc)));
@semcheck[this->name] = count();
}
tick-10sec
{
exit(0);
}
And i find where set the original script self->time to 0 before
syscall::semsys:return, if i used flowident to
root@thelab ~/Tools/IPC$ ./ipc_syscall_flow.d
CPU FUNCTION
0 => semsys syscall::semsys
0 -> semsys fbt:semsys:semsys
0 <- semsys fbt:semsys:semsys <-
1. point where syscall's self->time set to 0 in the original script
0 -> semop fbt:semsys:semop
0 -> ipc_lookup fbt:ipc:ipc_lookup
0 -> ipc_lock_internal fbt:ipc:ipc_lock_internal
0 <- ipc_lock_internal
fbt:ipc:ipc_lock_internal <- 2. point where syscall's self->time set
to 0 in the original script
0 <- ipc_lookup fbt:ipc:ipc_lookup
<- 3. point where syscall's self->time set to 0 in the
original script
0 -> ipcperm_access fbt:ipc:ipcperm_access
0 -> crgetuid fbt:genunix:crgetuid
0 <- crgetuid fbt:genunix:crgetuid
0 -> getzoneid fbt:genunix:getzoneid
0 <- getzoneid fbt:genunix:getzoneid
0 <- ipcperm_access
fbt:ipc:ipcperm_access <- 4. point where syscall's self->time set to 0
in the original script
0 -> avl_find fbt:genunix:avl_find
0 -> sem_undo_compar fbt:semsys:sem_undo_compar
0 <- sem_undo_compar
fbt:semsys:sem_undo_compar<- 5. point where syscall's self->time set
to 0 in the original script
0 <- avl_find fbt:genunix:avl_find
0 -> sem_undo_add fbt:semsys:sem_undo_add
0 <- sem_undo_add
fbt:semsys:sem_undo_add <- 6. point where syscall's self->time set to
0 in the original script
0 <- semop fbt:semsys:semop <- 7.
point where syscall's self->time set to 0 in the original script
0 <= semsys syscall::semsys
Time: 232750
My original script doesn't reach syscall::semsys:return in my original script.
Thanks a lot Pramod and Adam, it was my fault :)
Br.:
Cni
2011/8/26 Adam Leventhal <a...@delphix.com>:
> 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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