linux-kernel - [PATCH v3 3/5] perf/core: Don't need event_filter_match in merge_sched

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Date:   Fri, 25 Mar 2022 11:53:16 +0800
From:   Chengming Zhou <zhouchengming@...edance.com>
To:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...nel.org, namhyung@...nel.org, eranian@...gle.com
Cc:     linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        duanxiongchun@...edance.com, songmuchun@...edance.com,
        Chengming Zhou <zhouchengming@...edance.com>
Subject: [PATCH v3 3/5] perf/core: Don't need event_filter_match in merge_sched_in()

There is one obselete comment in perf_cgroup_switch(), since
we don't use event_filter_match() when event_sched_out().

Then found we needn't to use event_filter_match() in
merge_sched_in() too. Because now we use the perf_event groups
RB-tree to get the exact matched perf_events, don't need to
go through the event_filter_match() to check if matched again.

Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>
---
 kernel/events/core.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index dd985c77bc37..225d408deb1a 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -856,7 +856,8 @@ static void perf_cgroup_switch(struct task_struct *task, int mode)
 			cpu_ctx_sched_out(cpuctx, EVENT_ALL);
 			/*
 			 * must not be done before ctxswout due
-			 * to event_filter_match() in event_sched_out()
+			 * to update_cgrp_time_from_cpuctx() in
+			 * ctx_sched_out()
 			 */
 			cpuctx->cgrp = NULL;
 		}
@@ -3804,9 +3805,6 @@ static int merge_sched_in(struct perf_event *event, void *data)
 	if (event->state <= PERF_EVENT_STATE_OFF)
 		return 0;
 
-	if (!event_filter_match(event))
-		return 0;
-
 	if (group_can_go_on(event, cpuctx, *can_add_hw)) {
 		if (!group_sched_in(event, cpuctx, ctx))
 			list_add_tail(&event->active_list, get_event_list(event));
-- 
2.20.1