syscalltimes in examples

[linxz02@ovi.com]

Hi All,

I'm using SystemTap-1.3. I was wondering whether I captured a bug in the example of syscalltimes.

When I run syscalltimes as it is, I see a bunch of errors saying unresolved types. It turned out that the following patch will work:

in around line 156:

# Check filters
if ('$FILTER') {
target = 0
++        if ('$F_UID') {
            if (pid() in f_pid) {
                timebypid[name, pid()] <<< delta
                target = 1
            }
++        }
++       if ('$F_PID') {
            if (uid() in f_uid) {
                timebyuid[name, uid()] <<< delta
                target = 1
            }
++      }
++        if ('$F_EXEC') {
            if (execname() in f_exec) {
                timebyexec[name, execname()] <<< delta
                target = 1
            }
 ++       }
} else
target = 1

I guess the trick is that, say, if !'$F_UID', earlier code that uses f_pid will be statically eliminated. Therefore stap compiler is confused by the appearance of f_pid here.

Thoughts? Thanks.

-Felix