From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6FEB1C87FD1 for ; Tue, 5 Aug 2025 17:10:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:Message-ID:Date:Subject:CC:To:From: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=MDBvzVKssQSva27++Dk9F/cZ5uTyJvj5l+46UJDxufg=; b=MGRYXEowNgPXEtZuCjahEMTYCP vnK/py2sJOHw8sHZ6uUNd93CtX8b+OpI9o/7o5Bj07Ep2Cn6GeCcs1uVtqcT+FoKa6XnfNM20vBgi ALm5X3UjSbqdqR0L3VtWTIrKszwJ8cDqo0jQ9BZub16ND+LCwpNqDQllXJzMij8dkWXBJEKrwEyNR rVM+2wQ+SMjzvzhwKOqOsJltUDtiPKRNM71U5r2eWBCqnfRkecyfxT4YGrA1mpOpsFwbwQ2axBPUe 03cGFuHZ4z6UnlAJHaGc3XlmTf0588D4DO8zss/7Gaty8d0cX88YbgC2LbjPSaWOxNILBn6MIigUW 3n0t93cQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1ujLBY-0000000DO7r-0giM; Tue, 05 Aug 2025 17:10:48 +0000 Received: from mailgw01.mediatek.com ([216.200.240.184]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1ujJzC-0000000DCpq-3vKL; Tue, 05 Aug 2025 15:54:00 +0000 X-UUID: 6237fc78721411f09f706fa2197c6ceb-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-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.2,REQID:1f258234-e2ca-429b-b77a-7221cf0a8194,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:b320890f-6968-429c-a74d-a1cce2b698bd,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: 6237fc78721411f09f706fa2197c6ceb-20250805 Received: from mtkmbs11n2.mediatek.inc [(172.21.101.187)] by mailgw01.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1460845936; Tue, 05 Aug 2025 08:53:52 -0700 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 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250805_085358_985145_55FDAEDF X-CRM114-Status: GOOD ( 10.49 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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) } __enqueue_dl_entity(dl_se); + + if (dl_server(dl_se)) + printk_deferred_once("sched: dl_server activated\n"); } static void dequeue_dl_entity(struct sched_dl_entity *dl_se, int flags) -- 2.45.2