RE: opcontrol does not create results

William wrote:
>
> >
> >
> >
>
>
> You might take a look at
> http://people.redhat.com/wcohen/Fedora12OprofileTutorial.txt and
> use the following to get a better idea what it is doing in __do_softirq:
>
> opreport --include-symbols=__do_softirq --details

idcc-devel:~ # opreport -l --include-symbols=__do_softirq --details --image-path=/usr/lib/debug/boot/

warning: /af_packet could not be found.
...
warning: /xt_tcpudp could not be found.

CPU: CPU with timer interrupt, speed 0 MHz (estimated)
Profiling through timer interrupt
vma      samples  %        image name               app name                 symbol name
ffffffff8013a83b 4374     24.2676  vmlinux-2.6.16.60-0.103.1-smp.debug update-status            __do_softirq
  ffffffff8013a885 4374     100.000
ffffffff8013a83b 4204     23.3245  vmlinux-2.6.16.60-0.103.1-smp.debug transact                 __do_softirq
  ffffffff8013a885 4204     100.000
ffffffff8013a83b 2994     16.6112  vmlinux-2.6.16.60-0.103.1-smp.debug mono                     __do_softirq
  ffffffff8013a885 2994     100.000
ffffffff8013a83b 1543      8.5608  vmlinux-2.6.16.60-0.103.1-smp.debug vmlinux-2.6.16.60-0.103.1-smp.debug __do_softirq
  ffffffff8013a885 1543     100.000
ffffffff8013a83b 991       5.4982  vmlinux-2.6.16.60-0.103.1-smp.debug parse-metadata           __do_softirq
  ffffffff8013a885 991      100.000
ffffffff8013a83b 932       5.1709  vmlinux-2.6.16.60-0.103.1-smp.debug sshd                     __do_softirq
  ffffffff8013a885 932      100.000
ffffffff8013a83b 640       3.5508  vmlinux-2.6.16.60-0.103.1-smp.debug resolve-dependencies     __do_softirq
  ffffffff8013a885 640      100.000
ffffffff8013a83b 464       2.5743  vmlinux-2.6.16.60-0.103.1-smp.debug hald-addon-storage       __do_softirq
  ffffffff8013a885 464      100.000
ffffffff8013a83b 298       1.6534  vmlinux-2.6.16.60-0.103.1-smp.debug mysqld                   __do_softirq
  ffffffff8013a885 298      100.000
ffffffff8013a83b 271       1.5036  vmlinux-2.6.16.60-0.103.1-smp.debug top                      __do_softirq
  ffffffff8013a885 271      100.000

No new information for me.
>
> Maybe use the opannotate to see what lines of code in __do_softirq are
> getting the samples.
>

Hi,

i invoked "opannotate -s -o annotate -i __do_softirq -d /usr/src/linux/" and afterwards "less annotate/usr/src/linux-2.6.16.60-0.103.1/kernel/softirq.c".
What I got:

               :asmlinkage void __do_softirq(void)
               :{ /* __do_softirq total:  18024 100.000 */
               :        struct softirq_action *h;
               :        __u32 pending;
               :        int max_restart = MAX_SOFTIRQ_RESTART;
               :        int cpu;
               :
               :        pending = local_softirq_pending();
               :
               :        local_bh_disable();
               :        cpu = smp_processor_id();
               :restart:
               :        /* Reset the pending bitmask before enabling irqs */
               :        set_softirq_pending(0);
               :
               :        local_irq_enable();
               :
               :        h = softirq_vec;
               :
               :        do {
 18024 100.000 :                if (pending & 1) {
               :                        h->action(h);
               :                        rcu_bh_qsctr_inc(cpu);
               :                }
               :                h++;
               :                pending >>= 1;
               :        } while (pending);
               :
               :        local_irq_disable();
               :
               :        pending = local_softirq_pending();
               :        if (pending && --max_restart)
               :                goto restart;
               :
               :        if (pending)
               :                wakeup_softirqd();
               :
               :        __local_bh_enable();
               :}

and at the end:

/*
 * Total samples for file : "kernel/softirq.c"
 *
 *  18024 100.000
 */


/*
 * Command line: opannotate -s -o annotate -i __do_softirq -d /usr/src/linux/
 *
 * Interpretation of command line:
 * Output annotated source file with samples
 * Output all files
 *
 * CPU: CPU with timer interrupt, speed 0 MHz (estimated)
 * Profiling through timer interrupt
 */


What I understand is that __do_softirq has 18024 samples and all the samples spent their time in
       do {
                if (pending & 1) {
                        h->action(h);
                        rcu_bh_qsctr_inc(cpu);
                }
                h++;
                pending >>= 1;
        } while (pending);

Having a look at "Understanding the Linux Kernel" I find:
" For each bit set in the pending local variable, it executes the corresponding softirq function; recall that the function address for the softirq with index n is stored in softirq_vec[n]->action."
So here is where the respective softirq is startet. But which one ? How can I find out that ? Is there e.g. a way to check the variable h or pending ?


Bernd




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