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tracing/filters: use ring_buffer_discard_commit for discarded events

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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>
This commit is contained in:
Steven Rostedt 2009-04-02 01:16:59 -04:00 committed by Ingo Molnar
parent fa1b47dd85
commit 77d9f465d4
3 changed files with 11 additions and 5 deletions
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9
kernel/trace/trace.c
View File

@ -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

1
kernel/trace/trace.h
View File

@ -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);

6
kernel/trace/trace_events_stage_3.h
View File

@ -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); \
\
} \
\