forked from luck/tmp_suning_uos_patched
ftrace: add cpu annotation for function graph tracer
Impact: enhancement for function graph tracer When run on a SMP box, the function graph tracer is confusing because it shows the different CPUS as changes in the trace. This patch adds the annotation of 'CPU[###]' where ### is a three digit number. The output will look similar to this: CPU[001] dput() { CPU[000] } 726 CPU[001] } 487 CPU[000] do_softirq() { CPU[001] } 2221 CPU[000] __do_softirq() { CPU[000] __local_bh_disable() { CPU[001] unroll_tree_refs() { CPU[000] } 569 CPU[001] } 501 CPU[000] rcu_process_callbacks() { CPU[001] kfree() { What makes this nice is that now you can grep the file and produce readable format for a particular CPU. # cat /debug/tracing/trace > /tmp/trace # grep '^CPU\[000\]' /tmp/trace > /tmp/trace0 # grep '^CPU\[001\]' /tmp/trace > /tmp/trace1 Will give you: # head /tmp/trace0 CPU[000] ------------8<---------- thread sshd-3899 ------------8<---------- CPU[000] inotify_dentry_parent_queue_event() { CPU[000] } 2531 CPU[000] inotify_inode_queue_event() { CPU[000] } 505 CPU[000] } 69626 CPU[000] } 73089 CPU[000] audit_syscall_exit() { CPU[000] path_put() { CPU[000] dput() { # head /tmp/trace1 CPU[001] ------------8<---------- thread pcscd-3446 ------------8<---------- CPU[001] } 4186 CPU[001] dput() { CPU[001] } 543 CPU[001] vfs_permission() { CPU[001] inode_permission() { CPU[001] shmem_permission() { CPU[001] generic_permission() { CPU[001] } 501 CPU[001] } 2205 Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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660c7f9be9
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437f24fb89
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@ -28,7 +28,7 @@ static struct tracer_flags tracer_flags = {
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};
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/* pid on the last trace processed */
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static pid_t last_pid = -1;
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static pid_t last_pid[NR_CPUS] = { [0 ... NR_CPUS-1] = -1 };
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static int graph_trace_init(struct trace_array *tr)
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{
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@ -53,29 +53,34 @@ static void graph_trace_reset(struct trace_array *tr)
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}
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/* If the pid changed since the last trace, output this event */
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static int verif_pid(struct trace_seq *s, pid_t pid)
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static int verif_pid(struct trace_seq *s, pid_t pid, int cpu)
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{
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char *comm;
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if (last_pid != -1 && last_pid == pid)
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if (last_pid[cpu] != -1 && last_pid[cpu] == pid)
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return 1;
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last_pid = pid;
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last_pid[cpu] = pid;
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comm = trace_find_cmdline(pid);
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return trace_seq_printf(s, "\n------------8<---------- thread %s-%d"
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return trace_seq_printf(s, "\nCPU[%03d]"
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" ------------8<---------- thread %s-%d"
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" ------------8<----------\n\n",
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comm, pid);
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cpu, comm, pid);
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}
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static enum print_line_t
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print_graph_entry(struct ftrace_graph_ent *call, struct trace_seq *s,
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struct trace_entry *ent)
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struct trace_entry *ent, int cpu)
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{
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int i;
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int ret;
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if (!verif_pid(s, ent->pid))
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if (!verif_pid(s, ent->pid, cpu))
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return TRACE_TYPE_PARTIAL_LINE;
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ret = trace_seq_printf(s, "CPU[%03d] ", cpu);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
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@ -96,12 +101,16 @@ print_graph_entry(struct ftrace_graph_ent *call, struct trace_seq *s,
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static enum print_line_t
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print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
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struct trace_entry *ent)
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struct trace_entry *ent, int cpu)
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{
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int i;
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int ret;
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if (!verif_pid(s, ent->pid))
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if (!verif_pid(s, ent->pid, cpu))
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return TRACE_TYPE_PARTIAL_LINE;
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ret = trace_seq_printf(s, "CPU[%03d] ", cpu);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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for (i = 0; i < trace->depth * TRACE_GRAPH_INDENT; i++) {
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@ -137,12 +146,13 @@ print_graph_function(struct trace_iterator *iter)
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case TRACE_GRAPH_ENT: {
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struct ftrace_graph_ent_entry *field;
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trace_assign_type(field, entry);
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return print_graph_entry(&field->graph_ent, s, entry);
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return print_graph_entry(&field->graph_ent, s, entry,
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iter->cpu);
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}
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case TRACE_GRAPH_RET: {
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struct ftrace_graph_ret_entry *field;
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trace_assign_type(field, entry);
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return print_graph_return(&field->ret, s, entry);
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return print_graph_return(&field->ret, s, entry, iter->cpu);
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}
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default:
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return TRACE_TYPE_UNHANDLED;
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