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authorSteven Rostedt <srostedt@redhat.com>2009-04-02 01:16:59 -0400
committerIngo Molnar <mingo@elte.hu>2009-04-14 00:00:54 +0200
commit77d9f465d46fd67cdb82ee5e1ab99dd57a17c486 (patch)
treec21063ae5dff55522593f29e952c8a05958c6ce6
parentfa1b47dd85453ec7d4bcfe4aa4a2d172ba452fc3 (diff)
downloadlinux-77d9f465d46fd67cdb82ee5e1ab99dd57a17c486.tar.bz2
tracing/filters: use ring_buffer_discard_commit for discarded events
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> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--kernel/trace/trace.c9
-rw-r--r--kernel/trace/trace.h1
-rw-r--r--kernel/trace/trace_events_stage_3.h6
3 files changed, 11 insertions, 5 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index c209d214169c..d880ab2772ce 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -884,13 +884,18 @@ 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 3cf856fa597b..dfefffd7ae39 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -497,6 +497,7 @@ 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 9d2fa78cecca..d2f34bf30e59 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); \
\
} \
\