ftrace: sched_switch: show the wakee's cpu

While profiling the smp behaviour of the scheduler it was needed to know to
which cpu a task got woken.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8a00d6c5c0f5eab2d2318ae66e3d513870e4fbd4..7e6cb4fe62f25d45f0d84568299136b9ef20cc73 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -977,6 +977,7 @@ tracing_sched_switch_trace(struct trace_array *tr,
        entry->field.ctx.next_pid       = next->pid;
        entry->field.ctx.next_prio      = next->prio;
        entry->field.ctx.next_state     = next->state;
+       entry->field.ctx.next_cpu       = task_cpu(next);
        __trace_stack(tr, data, flags, 5);
        __raw_spin_unlock(&data->lock);
        raw_local_irq_restore(irq_flags);
@@ -1003,6 +1004,7 @@ tracing_sched_wakeup_trace(struct trace_array *tr,
        entry->field.ctx.next_pid       = wakee->pid;
        entry->field.ctx.next_prio      = wakee->prio;
        entry->field.ctx.next_state     = wakee->state;
+       entry->field.ctx.next_cpu       = task_cpu(wakee);
        __trace_stack(tr, data, flags, 6);
        __raw_spin_unlock(&data->lock);
        raw_local_irq_restore(irq_flags);
@@ -1636,10 +1638,11 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
                        __ffs(field->ctx.prev_state) + 1 : 0;
                S = state < sizeof(state_to_char) - 1 ? state_to_char[state] : 'X';
                comm = trace_find_cmdline(field->ctx.next_pid);
-               trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c %s\n",
+               trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
                                 field->ctx.prev_pid,
                                 field->ctx.prev_prio,
                                 S, entry->type == TRACE_CTX ? "==>" : "  +",
+                                field->ctx.next_cpu,
                                 field->ctx.next_pid,
                                 field->ctx.next_prio,
                                 T, comm);
@@ -1736,11 +1739,12 @@ static int print_trace_fmt(struct trace_iterator *iter)
                        state_to_char[field->ctx.prev_state] : 'X';
                T = field->ctx.next_state < sizeof(state_to_char) ?
                        state_to_char[field->ctx.next_state] : 'X';
-               ret = trace_seq_printf(s, " %5d:%3d:%c %s %5d:%3d:%c\n",
+               ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n",
                                       field->ctx.prev_pid,
                                       field->ctx.prev_prio,
                                       S,
                                       entry->type == TRACE_CTX ? "==>" : "  +",
+                                      field->ctx.next_cpu,
                                       field->ctx.next_pid,
                                       field->ctx.next_prio,
                                       T);
@@ -1817,10 +1821,11 @@ static int print_raw_fmt(struct trace_iterator *iter)
                        state_to_char[field->ctx.next_state] : 'X';
                if (entry->type == TRACE_WAKE)
                        S = '+';
-               ret = trace_seq_printf(s, "%d %d %c %d %d %c\n",
+               ret = trace_seq_printf(s, "%d %d %c %d %d %d %c\n",
                                       field->ctx.prev_pid,
                                       field->ctx.prev_prio,
                                       S,
+                                      field->ctx.next_cpu,
                                       field->ctx.next_pid,
                                       field->ctx.next_prio,
                                       T);
@@ -1893,6 +1898,7 @@ static int print_hex_fmt(struct trace_iterator *iter)
                SEQ_PUT_HEX_FIELD_RET(s, field->ctx.prev_pid);
                SEQ_PUT_HEX_FIELD_RET(s, field->ctx.prev_prio);
                SEQ_PUT_HEX_FIELD_RET(s, S);
+               SEQ_PUT_HEX_FIELD_RET(s, field->ctx.next_cpu);
                SEQ_PUT_HEX_FIELD_RET(s, field->ctx.next_pid);
                SEQ_PUT_HEX_FIELD_RET(s, field->ctx.next_prio);
                SEQ_PUT_HEX_FIELD_RET(s, T);

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 5f54c875c8be2ebbe1f16663667168bde1e5cb31..77c265f6a7790bb30b7b6143c8d34d1a9d463b50 100644 (file)
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -41,6 +41,7 @@ struct ctx_switch_entry {
        unsigned int            next_pid;
        unsigned char           next_prio;
        unsigned char           next_state;
+       unsigned int            next_cpu;
 };
 
 /*