Messages in this thread Patch in this message | | | Date | Thu, 02 Apr 2009 01:27:25 -0400 | From | Steven Rostedt <> | Subject | [PATCH 4/4] tracing/filters: use ring_buffer_discard_commit for discarded events |
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From: Steven Rostedt <srostedt@redhat.com>
The ring_buffer_discard_commit makes better usage of the ring_buffer when an event has been discarded. It tries to remove it completely if possible.
This patch converts the trace event filtering to use ring_buffer_discard_commit instead of the ring_buffer_event_discard.
Signed-off-by: Steven Rostedt <srostedt@redhat.com> --- kernel/trace/trace.c | 9 +++++++-- kernel/trace/trace.h | 1 + kernel/trace/trace_events_stage_3.h | 6 +++--- 3 files changed, 11 insertions(+), 5 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 8c27ac4..d89489c 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -893,13 +893,18 @@ trace_current_buffer_lock_reserve(unsigned char type, unsigned long len, void trace_current_buffer_unlock_commit(struct ring_buffer_event *event, unsigned long flags, int pc) { - return __trace_buffer_unlock_commit(&global_trace, event, flags, pc, 1); + __trace_buffer_unlock_commit(&global_trace, event, flags, pc, 1); } void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event, unsigned long flags, int pc) { - return __trace_buffer_unlock_commit(&global_trace, event, flags, pc, 0); + __trace_buffer_unlock_commit(&global_trace, event, flags, pc, 0); +} + +void trace_current_buffer_discard_commit(struct ring_buffer_event *event) +{ + ring_buffer_discard_commit(global_trace.buffer, event); } void diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 12316e3..c0d7a12 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -491,6 +491,7 @@ void trace_current_buffer_unlock_commit(struct ring_buffer_event *event, unsigned long flags, int pc); void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event, unsigned long flags, int pc); +void trace_current_buffer_discard_commit(struct ring_buffer_event *event); struct trace_entry *tracing_get_trace_entry(struct trace_array *tr, struct trace_array_cpu *data); diff --git a/kernel/trace/trace_events_stage_3.h b/kernel/trace/trace_events_stage_3.h index 9d2fa78..d2f34bf 100644 --- a/kernel/trace/trace_events_stage_3.h +++ b/kernel/trace/trace_events_stage_3.h @@ -223,9 +223,9 @@ static void ftrace_raw_event_##call(proto) \ assign; \ \ if (call->preds && !filter_match_preds(call, entry)) \ - ring_buffer_event_discard(event); \ - \ - trace_nowake_buffer_unlock_commit(event, irq_flags, pc); \ + trace_current_buffer_discard_commit(event); \ + else \ + trace_nowake_buffer_unlock_commit(event, irq_flags, pc); \ \ } \ \ -- 1.6.2.1 --
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