Steven noted that when the user-provided cpumask contains a single CPU, then the filtering function can use a scalar as input instead of a full-fledged cpumask.
Reuse do_filter_scalar_cpumask() when the input mask has a weight of one.
Suggested-by: Steven Rostedt rostedt@goodmis.org Signed-off-by: Valentin Schneider vschneid@redhat.com --- kernel/trace/trace_events_filter.c | 35 +++++++++++++++++++++++++++++- 1 file changed, 34 insertions(+), 1 deletion(-)
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c index 3009d0c61b532..2fe65ddeb34ef 100644 --- a/kernel/trace/trace_events_filter.c +++ b/kernel/trace/trace_events_filter.c @@ -70,6 +70,7 @@ enum filter_pred_fn { FILTER_PRED_FN_CPU, FILTER_PRED_FN_CPU_CPUMASK, FILTER_PRED_FN_CPUMASK, + FILTER_PRED_FN_CPUMASK_CPU, FILTER_PRED_FN_FUNCTION, FILTER_PRED_FN_, FILTER_PRED_TEST_VISITED, @@ -957,6 +958,22 @@ static int filter_pred_cpumask(struct filter_pred *pred, void *event) return do_filter_cpumask(pred->op, mask, cmp); }
+/* Filter predicate for cpumask field vs user-provided scalar */ +static int filter_pred_cpumask_cpu(struct filter_pred *pred, void *event) +{ + u32 item = *(u32 *)(event + pred->offset); + int loc = item & 0xffff; + const struct cpumask *mask = (event + loc); + unsigned int cpu = pred->val; + + /* + * This inverts the usual usage of the function (field is first element, + * user parameter is second), but that's fine because the (scalar, mask) + * operations used are symmetric. + */ + return do_filter_scalar_cpumask(pred->op, cpu, mask); +} + /* Filter predicate for COMM. */ static int filter_pred_comm(struct filter_pred *pred, void *event) { @@ -1453,6 +1470,8 @@ static int filter_pred_fn_call(struct filter_pred *pred, void *event) return filter_pred_cpu_cpumask(pred, event); case FILTER_PRED_FN_CPUMASK: return filter_pred_cpumask(pred, event); + case FILTER_PRED_FN_CPUMASK_CPU: + return filter_pred_cpumask_cpu(pred, event); case FILTER_PRED_FN_FUNCTION: return filter_pred_function(pred, event); case FILTER_PRED_TEST_VISITED: @@ -1666,6 +1685,7 @@ static int parse_pred(const char *str, void *data,
} else if (!strncmp(str + i, "CPUS", 4)) { unsigned int maskstart; + bool single; char *tmp;
switch (field->filter_type) { @@ -1724,8 +1744,21 @@ static int parse_pred(const char *str, void *data,
/* Move along */ i++; + + /* + * Optimisation: if the user-provided mask has a weight of one + * then we can treat it as a scalar input. + */ + single = cpumask_weight(pred->mask) == 1; + if (single && field->filter_type == FILTER_CPUMASK) { + pred->val = cpumask_first(pred->mask); + kfree(pred->mask); + } + if (field->filter_type == FILTER_CPUMASK) { - pred->fn_num = FILTER_PRED_FN_CPUMASK; + pred->fn_num = single ? + FILTER_PRED_FN_CPUMASK_CPU : + FILTER_PRED_FN_CPUMASK; } else if (field->filter_type == FILTER_CPU) { pred->fn_num = FILTER_PRED_FN_CPU_CPUMASK; } else {