* Steven Rostedt (rostedt@xxxxxxxxxxx) wrote:
> This adds the task comm and pid to the trace output. This gives the
> output like:
>
> CPU 0: sshd:2605 [<ffffffff80251858>] remove_wait_queue+0xc/0x4a <-- [<ffffffff802ad7be>] free_poll_entry+0x1e/0x2a
> CPU 2: bash:2610 [<ffffffff8038c3aa>] tty_check_change+0x9/0xb6 <-- [<ffffffff8038d295>] tty_ioctl+0x59f/0xcdd
> CPU 0: sshd:2605 [<ffffffff80491ec6>] _spin_lock_irqsave+0xe/0x81 <-- [<ffffffff80251863>] remove_wait_queue+0x17/0x4a
> CPU 2: bash:2610 [<ffffffff8024e2f7>] find_vpid+0x9/0x24 <-- [<ffffffff8038d325>] tty_ioctl+0x62f/0xcdd
> CPU 0: sshd:2605 [<ffffffff804923ec>] _spin_unlock_irqrestore+0x9/0x3a <-- [<ffffffff80251891>] remove_wait_queue+0x45/0x4a
> CPU 0: sshd:2605 [<ffffffff802a18b3>] fput+0x9/0x1b <-- [<ffffffff802ad7c6>] free_poll_entry+0x26/0x2a
>
>
> Signed-off-by: Steven Rostedt <srostedt@xxxxxxxxxx>
> ---
> lib/mcount/tracer.c | 6 +++++-
> lib/mcount/tracer.h | 3 +++
> 2 files changed, 8 insertions(+), 1 deletion(-)
>
> Index: linux-compile.git/lib/mcount/tracer.c
> ===================================================================
> --- linux-compile.git.orig/lib/mcount/tracer.c 2008-01-02 23:17:21.000000000 -0500
> +++ linux-compile.git/lib/mcount/tracer.c 2008-01-02 23:17:44.000000000 -0500
> @@ -34,6 +34,7 @@ mctracer_add_trace_entry(struct mctracer
> {
> unsigned long idx, idx_next;
> struct mctracer_entry *entry;
> + struct task_struct *tsk = current;
Aren't there situations, like in the middle of a context switch, where
current is not valid ? Is also poses a problem for early boot, and NMI
tracing.
>
> idx = tr->trace_idx[cpu];
> idx_next = idx + 1;
> @@ -52,6 +53,8 @@ mctracer_add_trace_entry(struct mctracer
> entry->idx = atomic_inc_return(&tr->cnt);
> entry->ip = ip;
> entry->parent_ip = parent_ip;
> + entry->pid = tsk->pid;
> + memcpy(entry->comm, tsk->comm, TASK_COMM_LEN);
> }
>
> static inline notrace void trace_function(const unsigned long ip,
> @@ -223,7 +226,8 @@ static int s_show(struct seq_file *m, vo
> return -1;
> }
>
> - seq_printf(m, " CPU %d: ", iter->cpu);
> + seq_printf(m, "CPU %d: ", iter->cpu);
> + seq_printf(m, "%s:%d ", iter->ent->comm, iter->ent->pid);
> seq_print_ip_sym(m, iter->ent->ip);
> if (iter->ent->parent_ip) {
> seq_printf(m, " <-- ");
> Index: linux-compile.git/lib/mcount/tracer.h
> ===================================================================
> --- linux-compile.git.orig/lib/mcount/tracer.h 2008-01-02 23:16:15.000000000 -0500
> +++ linux-compile.git/lib/mcount/tracer.h 2008-01-02 23:17:44.000000000 -0500
> @@ -2,11 +2,14 @@
> #define _LINUX_MCOUNT_TRACER_H
>
> #include <asm/atomic.h>
> +#include <linux/sched.h>
>
> struct mctracer_entry {
> unsigned long idx;
> unsigned long ip;
> unsigned long parent_ip;
> + char comm[TASK_COMM_LEN];
> + pid_t pid;
> };
>
> struct mctracer_trace {
>
> --
--
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
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