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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-05-18 18:08:32 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-05-18 18:35:46 +0200 |
| commit | 4f41c013f553957765902fb01475972f0af3e8e7 (patch) | |
| tree | ddaa54947cc990094a4b270f2f8b3d6da195044f /kernel/trace/trace_event_perf.c | |
| parent | ef4f30f54e265c2f6f9ac9eda4db158a4e16050b (diff) | |
| download | linux-4f41c013f553957765902fb01475972f0af3e8e7.tar.gz linux-4f41c013f553957765902fb01475972f0af3e8e7.tar.bz2 linux-4f41c013f553957765902fb01475972f0af3e8e7.zip | |
perf/ftrace: Optimize perf/tracepoint interaction for single events
When we've got but a single event per tracepoint
there is no reason to try and multiplex it so don't.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Tested-by: Ingo Molnar <mingo@elte.hu>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/trace_event_perf.c')
| -rw-r--r-- | kernel/trace/trace_event_perf.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c index 0565bb42566f..89b780a7c522 100644 --- a/kernel/trace/trace_event_perf.c +++ b/kernel/trace/trace_event_perf.c @@ -27,13 +27,15 @@ typedef typeof(unsigned long [PERF_MAX_TRACE_SIZE / sizeof(unsigned long)]) /* Count the events in use (per event id, not per instance) */ static int total_ref_count; -static int perf_trace_event_enable(struct ftrace_event_call *event) +static int perf_trace_event_enable(struct ftrace_event_call *event, void *data) { char *buf; int ret = -ENOMEM; - if (event->perf_refcount++ > 0) + if (event->perf_refcount++ > 0) { + event->perf_data = NULL; return 0; + } if (!total_ref_count) { buf = (char *)alloc_percpu(perf_trace_t); @@ -51,6 +53,7 @@ static int perf_trace_event_enable(struct ftrace_event_call *event) ret = event->perf_event_enable(event); if (!ret) { + event->perf_data = data; total_ref_count++; return 0; } @@ -68,7 +71,7 @@ fail_buf: return ret; } -int perf_trace_enable(int event_id) +int perf_trace_enable(int event_id, void *data) { struct ftrace_event_call *event; int ret = -EINVAL; @@ -77,7 +80,7 @@ int perf_trace_enable(int event_id) list_for_each_entry(event, &ftrace_events, list) { if (event->id == event_id && event->perf_event_enable && try_module_get(event->mod)) { - ret = perf_trace_event_enable(event); + ret = perf_trace_event_enable(event, data); break; } } |