[lttng-dev] sched_process_exec

[Mathieu Desnoyers]

* Woegerer, Paul (Paul_Woegerer at mentor.com) wrote:
> Hi,
>
> Is there a reason why instrumentation/events/lttng-module/sched.h does  
> not include TRACE_EVENT(sched_process_exec) ?
>
> The patch below adds the missing tracepoint definition (tested with  
> kernel 3.4.6-2.10).

Hi Paul,

The only reason is because it appeared in a later kernel than the one
used when generating the lttng-modules trace event instrumentation.

A couple a details to fix before I can merge this patch though:

Please also update instrumentation/events/mainline/sched.h to add the
original mainline TRACE_EVENT, so we can keep the files in sync.

>
> diff --git a/instrumentation/events/lttng-module/sched.h  
> b/instrumentation/events/lttng-module/sched.h
> index b68616e..ef791ac 100644
> --- a/instrumentation/events/lttng-module/sched.h
> +++ b/instrumentation/events/lttng-module/sched.h
> @@ -314,6 +314,32 @@ TRACE_EVENT(sched_process_fork,
>  )
>
>  /*
> + * Tracepoint for exec:
> + */
> +TRACE_EVENT(sched_process_exec,
> +
> +       TP_PROTO(struct task_struct *p, pid_t old_pid,
> +                struct linux_binprm *bprm),
> +
> +       TP_ARGS(p, old_pid, bprm),
> +
> +       TP_STRUCT__entry(
> +               __string(       filename,       bprm->filename  )
> +               __field(        pid_t,          pid             )
> +               __field(        pid_t,          old_pid         )
> +       ),
> +
> +       TP_fast_assign(
> +               tp_strcpy(filename, bprm->filename);

Please remove the ";" above.

> +               tp_assign(pid, p->pid)
> +               tp_assign(old_pid, old_pid)
> +       ),
> +
> +       TP_printk("filename=%s pid=%d old_pid=%d", __get_str(filename),
> +                 __entry->pid, __entry->old_pid)
> +)
> +
> +/*
>   * XXX the below sched_stat tracepoints only apply to  
> SCHED_OTHER/BATCH/IDLE

A newline has been added by your mail client, which causes the patch to
not apply correctly.

Hints on how to configure mail clients for sending patches can be looked
up in the Linux kernel tree, under Documentation/email-clients.txt

Thanks!

Mathieu

>   *     adding sched_stat support to SCHED_FIFO/RR would be welcome.
>   */
>
> -- 
> Paul Woegerer | SW Development Engineer
> http://go.mentor.com/sourceryanalyzer
>
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-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com