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tracing/filters: Enable filtering the CPU common field by a cpumask 

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}'

Link: https://lkml.kernel.org/r/20230707172155.70873-5-vschneid@redhat.com

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Leonardo Bras <leobras@redhat.com>
Cc: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Valentin Schneider <vschneid@redhat.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Valentin Schneider 2023-07-07 18:21:50 +01:00 committed by Steven Rostedt (Google)
parent 3cbec9d7b9
commit 347d24fc82
1 changed files with 14 additions and 0 deletions
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14
kernel/trace/trace_events_filter.c
View File

@ -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: