From nobody Sun Oct 5 10:47:04 2025 Received: from mailgw01.mediatek.com (unknown [60.244.123.138]) (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 8B70F1C84B8 for ; Tue, 5 Aug 2025 15:54:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=60.244.123.138 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754409251; cv=none; b=IjrBWx1a4k229GS3R832V+9Mpz1uwROIt42bAUSUOhrDrYyfhRnYnVhv0DAqwYKBrfhNkqJ4l0wOo/wYLa1zFWUPlRfIo/KZpc9aCq5h+edFs1DIjsJ2VZbMUMFWgqxSIBjeK5/EbeqFq5B/gl1uL8X6wVFJXL34zCRVMiTP7UY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754409251; c=relaxed/simple; bh=1DLj+UIzPcRfqcLsZC4XHHacraADOCrmwZgUgHtfmzs=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=FwCvGeSSvNWxxw8Q3baqWi5EWil3gdf5/dVYzyJS7RP35j+/7iI+fgFYjfd2i+BzvTH6EyzFYuDbshuwRCC0fpmFpQp97f7L97+KESO7c8F5kzz1ALAnHWVuWDGVEg4yQCPLHDpRtkCBHK5PIANF0gRxKPmdCV61Yesq9SHFiAQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com; spf=pass smtp.mailfrom=mediatek.com; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b=FBIbUXO9; arc=none smtp.client-ip=60.244.123.138 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=mediatek.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mediatek.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=mediatek.com header.i=@mediatek.com header.b="FBIbUXO9" X-UUID: 634025c8721411f08871991801538c65-20250805 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:Content-Transfer-Encoding:MIME-Version:Message-ID:Date:Subject:CC:To:From; bh=MDBvzVKssQSva27++Dk9F/cZ5uTyJvj5l+46UJDxufg=; b=FBIbUXO9qrQ4eYsTnY/6jrIVX1SfrsS2u6WJNCXU5tYg61qae9Cy5kgkdanSsc8n/apxrRK9E3ux1Ucze1EX4IiQqW57vDRNvUWurxceKcSEAdprIqaq9QK+SSzFjyctET4iHY39tu5T9VUpIdNhiPMSMaR6NSZxXvV+GL66lxU=; X-CID-CACHE: Type:Local,Time:202508052353+08,HitQuantity:1 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.2,REQID:8c928d11-75d7-4a81-b167-18d4e39d130b,IP:0,UR L:0,TC:0,Content:-5,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:-5 X-CID-META: VersionHash:9eb4ff7,CLOUDID:aadd2409-aadc-4681-92d7-012627504691,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102,TC:-5,Content:0|15|50,EDM:-3,IP: nil,URL:0,File:nil,RT:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,L ES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 0 X-CID-BAS: 0,_,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: 634025c8721411f08871991801538c65-20250805 Received: from mtkmbs11n1.mediatek.inc [(172.21.101.185)] by mailgw01.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 2053633338; Tue, 05 Aug 2025 23:53:53 +0800 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by mtkmbs10n1.mediatek.inc (172.21.101.34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.39; Tue, 5 Aug 2025 23:53:49 +0800 Received: from mtksitap99.mediatek.inc (10.233.130.16) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1258.39 via Frontend Transport; Tue, 5 Aug 2025 23:53:49 +0800 From: Kuyo Chang To: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , "Mel Gorman" , Valentin Schneider , "Matthias Brugger" , AngeloGioacchino Del Regno CC: kuyo chang , , , Subject: [PATCH] sched/deadline: Add DL server activated message Date: Tue, 5 Aug 2025 23:53:32 +0800 Message-ID: <20250805155347.1693676-1-kuyo.chang@mediatek.com> X-Mailer: git-send-email 2.45.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-MTK: N Content-Type: text/plain; charset="utf-8" From: kuyo chang The DL server is introduced as a replacement for realtime throttling. When RT throttling is activated, a message "sched: RT throttling activated" is shown. However, it is currently difficult for users to know when the DL server is activated. This patch adds a similar message to indicate when the DL server is activated, which helps users debug RT/CFS contention issues. Signed-off-by: kuyo chang --- kernel/sched/deadline.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index e2d51f4306b3..8e0de6cdb980 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -2042,6 +2042,9 @@ enqueue_dl_entity(struct sched_dl_entity *dl_se, int = flags) } =20 __enqueue_dl_entity(dl_se); + + if (dl_server(dl_se)) + printk_deferred_once("sched: dl_server activated\n"); } =20 static void dequeue_dl_entity(struct sched_dl_entity *dl_se, int flags) --=20 2.45.2