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authorShan Wei <davidshan@tencent.com>2012-11-03 00:38:33 -0400
committerSteven Rostedt <rostedt@goodmis.org>2012-11-13 15:51:21 -0500
commit1c7d66732458dc187008e3f5b2f71e019e320fc2 (patch)
tree7593a3f3c921902ebff8b75e8600deb6730444e1 /include/trace
parent11043d8b125671a32253cddb0b05177be0e976f6 (diff)
tracing: Kill unused and puzzled sample code in ftrace.h
When doing per-cpu helper optimizing work, find that this code is so puzzled. 1. It's mark as comment text, maybe a sample function for guidelines or a todo work. 2. But, this sample code is odd where struct perf_trace_buf is nonexistent. commit ce71b9 delete struct perf_trace_buf definition. Author: Frederic Weisbecker <fweisbec@gmail.com> Date: Sun Nov 22 05:26:55 2009 +0100 tracing: Use the perf recursion protection from trace event Is it necessary to keep there? just compile test. Link: http://lkml.kernel.org/r/50949FC9.6050202@gmail.com Signed-off-by: Shan Wei <davidshan@tencent.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/trace')
-rw-r--r--include/trace/ftrace.h73
1 files changed, 0 insertions, 73 deletions
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 698f2a890322..40dc5e8fe340 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -619,79 +619,6 @@ __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
619 619
620#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 620#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
621 621
622/*
623 * Define the insertion callback to perf events
624 *
625 * The job is very similar to ftrace_raw_event_<call> except that we don't
626 * insert in the ring buffer but in a perf counter.
627 *
628 * static void ftrace_perf_<call>(proto)
629 * {
630 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
631 * struct ftrace_event_call *event_call = &event_<call>;
632 * extern void perf_tp_event(int, u64, u64, void *, int);
633 * struct ftrace_raw_##call *entry;
634 * struct perf_trace_buf *trace_buf;
635 * u64 __addr = 0, __count = 1;
636 * unsigned long irq_flags;
637 * struct trace_entry *ent;
638 * int __entry_size;
639 * int __data_size;
640 * int __cpu
641 * int pc;
642 *
643 * pc = preempt_count();
644 *
645 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
646 *
647 * // Below we want to get the aligned size by taking into account
648 * // the u32 field that will later store the buffer size
649 * __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
650 * sizeof(u64));
651 * __entry_size -= sizeof(u32);
652 *
653 * // Protect the non nmi buffer
654 * // This also protects the rcu read side
655 * local_irq_save(irq_flags);
656 * __cpu = smp_processor_id();
657 *
658 * if (in_nmi())
659 * trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
660 * else
661 * trace_buf = rcu_dereference_sched(perf_trace_buf);
662 *
663 * if (!trace_buf)
664 * goto end;
665 *
666 * trace_buf = per_cpu_ptr(trace_buf, __cpu);
667 *
668 * // Avoid recursion from perf that could mess up the buffer
669 * if (trace_buf->recursion++)
670 * goto end_recursion;
671 *
672 * raw_data = trace_buf->buf;
673 *
674 * // Make recursion update visible before entering perf_tp_event
675 * // so that we protect from perf recursions.
676 *
677 * barrier();
678 *
679 * //zero dead bytes from alignment to avoid stack leak to userspace:
680 * *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
681 * entry = (struct ftrace_raw_<call> *)raw_data;
682 * ent = &entry->ent;
683 * tracing_generic_entry_update(ent, irq_flags, pc);
684 * ent->type = event_call->id;
685 *
686 * <tstruct> <- do some jobs with dynamic arrays
687 *
688 * <assign> <- affect our values
689 *
690 * perf_tp_event(event_call->id, __addr, __count, entry,
691 * __entry_size); <- submit them to perf counter
692 *
693 * }
694 */
695 622
696#ifdef CONFIG_PERF_EVENTS 623#ifdef CONFIG_PERF_EVENTS
697 624