linux-kernel - [tip: perf/core] perf/ring_buffer: Trigger IO signals for watermark

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Date: Sun, 14 Apr 2024 20:47:10 -0000
From: "tip-bot2 for Kyle Huey" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Kyle Huey <khuey@...ehuey.com>, Ingo Molnar <mingo@...nel.org>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject:
 [tip: perf/core] perf/ring_buffer: Trigger IO signals for watermark_wakeup

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     fd20bb51ed3913e0d25085eb79e8c0babfb4ee28
Gitweb:        https://git.kernel.org/tip/fd20bb51ed3913e0d25085eb79e8c0babfb4ee28
Author:        Kyle Huey <me@...ehuey.com>
AuthorDate:    Sat, 13 Apr 2024 07:16:18 -07:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Sun, 14 Apr 2024 22:26:32 +02:00

perf/ring_buffer: Trigger IO signals for watermark_wakeup

perf_output_wakeup() already marks the perf event fd available for polling.
Trigger IO signals with FASYNC too.

Signed-off-by: Kyle Huey <khuey@...ehuey.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Link: https://lore.kernel.org/r/20240413141618.4160-3-khuey@kylehuey.com
---
 kernel/events/ring_buffer.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c
index 60ed43d..4013408 100644
--- a/kernel/events/ring_buffer.c
+++ b/kernel/events/ring_buffer.c
@@ -22,6 +22,10 @@ static void perf_output_wakeup(struct perf_output_handle *handle)
 	atomic_set(&handle->rb->poll, EPOLLIN);
 
 	handle->event->pending_wakeup = 1;
+
+	if (*perf_event_fasync(handle->event) && !handle->event->pending_kill)
+		handle->event->pending_kill = POLL_IN;
+
 	irq_work_queue(&handle->event->pending_irq);
 }