From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 845DC2D0ADF; Mon, 5 May 2025 22:50:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746485455; cv=none; b=OoZq8z4hqaXMu1oWD77f/Y/ERgUimAdQYdx/cagMnFYXgl+5r+ufdKHlwZ4TJcchIw/xdmolBQI6cpgMR+HpCnQ3EKs+60izrV7dIngg8Z3tLoElNZUFrOvMSO+DkIt2x6jpO5oFhtWuT0o9UOI23ch6tWtYie4mbkFbyrBOzHU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746485455; c=relaxed/simple; bh=278IV81JzT2ECCT9Q16Te2UEzAsRINnmBUFRIBgSpyg=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=GrGivIzzJ1wETYwuRT8WoldasJwV7f/dK8q/ryynZxr+wrNahL/YHn0uQQXK9l09c5Lu9UL5JQreL5a+qGxuTL+lLXJT8FcaumAFK0dw7JkUZ+CCAPRoG9OOAmQKNXMomCGrR4smfI+nJ+5O22/nk/YoACAOhnZjJOPr+SM9/n4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Vw9Nhc4g; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Vw9Nhc4g" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 003F6C4CEE4; Mon, 5 May 2025 22:50:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746485455; bh=278IV81JzT2ECCT9Q16Te2UEzAsRINnmBUFRIBgSpyg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Vw9Nhc4gGlyRBpyf8HFYa9rOOyeTgFTdErpf4/ZBSTKdtYytIrRYRYkRmJy1z6Spy 9vI9KlEaY5zrl5O3fRsDxe9rAm/46anibs8A+7Gse2N9oGS+mttYgU6/kmCifUq99y 5dzMco/NoGdrwmqBamPi7yztRGeYZpdjLezHK9wBzT0QiBnmxa/46Y7CBSh//5ZLqf vMuZXfDBkf8+IrvhDPVdHbPq6swOXWClxXMA4UPhE6GjtBdtoc1ATRbtfBRTj/gnD6 f9Iur8ez6xHibn5/hwH/fqtEWlXu/DgG6cORGEuWN6DYS7pca8f/Fob+IXxkJMTASq VO6IDfa3OdC9g== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Hans Verkuil , "Artem S . Tashkinov" , Nicolas Dufresne , Mauro Carvalho Chehab , Sasha Levin , mchehab@kernel.org, linux-media@vger.kernel.org Subject: [PATCH AUTOSEL 6.12 320/486] media: test-drivers: vivid: don't call schedule in loop Date: Mon, 5 May 2025 18:36:36 -0400 Message-Id: <20250505223922.2682012-320-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505223922.2682012-1-sashal@kernel.org> References: <20250505223922.2682012-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.12.26 Content-Transfer-Encoding: 8bit From: Hans Verkuil [ Upstream commit e4740118b752005cbed339aec9a1d1c43620e0b9 ] Artem reported that the CPU load was 100% when capturing from vivid at low resolution with ffmpeg. This was caused by: while (time_is_after_jiffies(cur_jiffies + wait_jiffies) && !kthread_should_stop()) schedule(); If there are no other processes running that can be scheduled, then this is basically a busy-loop. Change it to wait_event_interruptible_timeout() which doesn't have that problem. Signed-off-by: Hans Verkuil Reported-by: Artem S. Tashkinov Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219570 Reviewed-by: Nicolas Dufresne Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/test-drivers/vivid/vivid-kthread-cap.c | 11 ++++++++--- drivers/media/test-drivers/vivid/vivid-kthread-out.c | 11 ++++++++--- .../media/test-drivers/vivid/vivid-kthread-touch.c | 11 ++++++++--- drivers/media/test-drivers/vivid/vivid-sdr-cap.c | 11 ++++++++--- 4 files changed, 32 insertions(+), 12 deletions(-) diff --git a/drivers/media/test-drivers/vivid/vivid-kthread-cap.c b/drivers/media/test-drivers/vivid/vivid-kthread-cap.c index 669bd96da4c79..273e8ed8c2a90 100644 --- a/drivers/media/test-drivers/vivid/vivid-kthread-cap.c +++ b/drivers/media/test-drivers/vivid/vivid-kthread-cap.c @@ -789,9 +789,14 @@ static int vivid_thread_vid_cap(void *data) next_jiffies_since_start = jiffies_since_start; wait_jiffies = next_jiffies_since_start - jiffies_since_start; - while (time_is_after_jiffies(cur_jiffies + wait_jiffies) && - !kthread_should_stop()) - schedule(); + if (!time_is_after_jiffies(cur_jiffies + wait_jiffies)) + continue; + + wait_queue_head_t wait; + + init_waitqueue_head(&wait); + wait_event_interruptible_timeout(wait, kthread_should_stop(), + cur_jiffies + wait_jiffies - jiffies); } dprintk(dev, 1, "Video Capture Thread End\n"); return 0; diff --git a/drivers/media/test-drivers/vivid/vivid-kthread-out.c b/drivers/media/test-drivers/vivid/vivid-kthread-out.c index fac6208b51da8..015a7b166a1e6 100644 --- a/drivers/media/test-drivers/vivid/vivid-kthread-out.c +++ b/drivers/media/test-drivers/vivid/vivid-kthread-out.c @@ -235,9 +235,14 @@ static int vivid_thread_vid_out(void *data) next_jiffies_since_start = jiffies_since_start; wait_jiffies = next_jiffies_since_start - jiffies_since_start; - while (time_is_after_jiffies(cur_jiffies + wait_jiffies) && - !kthread_should_stop()) - schedule(); + if (!time_is_after_jiffies(cur_jiffies + wait_jiffies)) + continue; + + wait_queue_head_t wait; + + init_waitqueue_head(&wait); + wait_event_interruptible_timeout(wait, kthread_should_stop(), + cur_jiffies + wait_jiffies - jiffies); } dprintk(dev, 1, "Video Output Thread End\n"); return 0; diff --git a/drivers/media/test-drivers/vivid/vivid-kthread-touch.c b/drivers/media/test-drivers/vivid/vivid-kthread-touch.c index fa711ee36a3fb..c862689786b69 100644 --- a/drivers/media/test-drivers/vivid/vivid-kthread-touch.c +++ b/drivers/media/test-drivers/vivid/vivid-kthread-touch.c @@ -135,9 +135,14 @@ static int vivid_thread_touch_cap(void *data) next_jiffies_since_start = jiffies_since_start; wait_jiffies = next_jiffies_since_start - jiffies_since_start; - while (time_is_after_jiffies(cur_jiffies + wait_jiffies) && - !kthread_should_stop()) - schedule(); + if (!time_is_after_jiffies(cur_jiffies + wait_jiffies)) + continue; + + wait_queue_head_t wait; + + init_waitqueue_head(&wait); + wait_event_interruptible_timeout(wait, kthread_should_stop(), + cur_jiffies + wait_jiffies - jiffies); } dprintk(dev, 1, "Touch Capture Thread End\n"); return 0; diff --git a/drivers/media/test-drivers/vivid/vivid-sdr-cap.c b/drivers/media/test-drivers/vivid/vivid-sdr-cap.c index 38cda33dffb2a..97cfc58b70571 100644 --- a/drivers/media/test-drivers/vivid/vivid-sdr-cap.c +++ b/drivers/media/test-drivers/vivid/vivid-sdr-cap.c @@ -206,9 +206,14 @@ static int vivid_thread_sdr_cap(void *data) next_jiffies_since_start = jiffies_since_start; wait_jiffies = next_jiffies_since_start - jiffies_since_start; - while (time_is_after_jiffies(cur_jiffies + wait_jiffies) && - !kthread_should_stop()) - schedule(); + if (!time_is_after_jiffies(cur_jiffies + wait_jiffies)) + continue; + + wait_queue_head_t wait; + + init_waitqueue_head(&wait); + wait_event_interruptible_timeout(wait, kthread_should_stop(), + cur_jiffies + wait_jiffies - jiffies); } dprintk(dev, 1, "SDR Capture Thread End\n"); return 0; -- 2.39.5