The tracing_cpumask lets us specify which CPUs are traced in a buffer instance, but doesn't let us do this on a per-event basis (unless one creates an instance per event).
A previous commit added filtering scalar fields by a user-given cpumask, make this work with the CPU common field as well.
This enables doing things like
$ trace-cmd record -e 'sched_switch' -f 'CPU & CPUS{12-52}' \ -e 'sched_wakeup' -f 'target_cpu & CPUS{12-52}'
Signed-off-by: Valentin Schneider vschneid@redhat.com --- kernel/trace/trace_events_filter.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c index 1e14f801685a8..3009d0c61b532 100644 --- a/kernel/trace/trace_events_filter.c +++ b/kernel/trace/trace_events_filter.c @@ -68,6 +68,7 @@ enum filter_pred_fn { FILTER_PRED_FN_PCHAR_USER, FILTER_PRED_FN_PCHAR, FILTER_PRED_FN_CPU, + FILTER_PRED_FN_CPU_CPUMASK, FILTER_PRED_FN_CPUMASK, FILTER_PRED_FN_FUNCTION, FILTER_PRED_FN_, @@ -937,6 +938,14 @@ static int filter_pred_cpu(struct filter_pred *pred, void *event) } }
+/* Filter predicate for current CPU vs user-provided cpumask */ +static int filter_pred_cpu_cpumask(struct filter_pred *pred, void *event) +{ + int cpu = raw_smp_processor_id(); + + return do_filter_scalar_cpumask(pred->op, cpu, pred->mask); +} + /* Filter predicate for cpumask field vs user-provided cpumask */ static int filter_pred_cpumask(struct filter_pred *pred, void *event) { @@ -1440,6 +1449,8 @@ static int filter_pred_fn_call(struct filter_pred *pred, void *event) return filter_pred_pchar(pred, event); case FILTER_PRED_FN_CPU: return filter_pred_cpu(pred, event); + case FILTER_PRED_FN_CPU_CPUMASK: + return filter_pred_cpu_cpumask(pred, event); case FILTER_PRED_FN_CPUMASK: return filter_pred_cpumask(pred, event); case FILTER_PRED_FN_FUNCTION: @@ -1659,6 +1670,7 @@ static int parse_pred(const char *str, void *data,
switch (field->filter_type) { case FILTER_CPUMASK: + case FILTER_CPU: case FILTER_OTHER: break; default: @@ -1714,6 +1726,8 @@ static int parse_pred(const char *str, void *data, i++; if (field->filter_type == FILTER_CPUMASK) { pred->fn_num = FILTER_PRED_FN_CPUMASK; + } else if (field->filter_type == FILTER_CPU) { + pred->fn_num = FILTER_PRED_FN_CPU_CPUMASK; } else { switch (field->size) { case 8: