From nobody Thu Nov 14 06:20:01 2024 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D56EEEB64DA for ; Wed, 14 Jun 2023 00:26:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241382AbjFNA0l (ORCPT ); Tue, 13 Jun 2023 20:26:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54292 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241337AbjFNA0g (ORCPT ); Tue, 13 Jun 2023 20:26:36 -0400 Received: from mailgw01.mediatek.com (unknown [60.244.123.138]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 396C01980; Tue, 13 Jun 2023 17:26:31 -0700 (PDT) X-UUID: 1a3fe1580a4a11ee9cb5633481061a41-20230614 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:MIME-Version:Message-ID:Date:Subject:CC:To:From; bh=2uy7+tbw1Y+OXG3TkTMsX7CtXTp/7125jL2NZJ+Idfc=; b=gQ9sGR3+KlNe79dhoLjaUuRNiFG75wC79fmSpvmB043BC5IRIT7QxjT/7gx/G9aKhpS/B/jOid5Lfzy4X3/C2bD9vPYkcCXzPSLAundwUw+ntfmP23K5n9HUUlM28VgsAz1q2tQ8eIf769FeOZZvdqzg3M0cfCdpUXwmnS/DfgY=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.26,REQID:18cfa8ad-5e09-4811-be40-661661b4fd81,IP:0,U RL: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:cb9a4e1,CLOUDID:9b57f96e-2f20-4998-991c-3b78627e4938,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102,TC:nil,Content:0,EDM:-3,IP:nil,U RL:0,File:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO X-CID-BVR: 0 X-CID-BAS: 0,_,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-UUID: 1a3fe1580a4a11ee9cb5633481061a41-20230614 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 2114748177; Wed, 14 Jun 2023 08:26:27 +0800 Received: from mtkmbs11n1.mediatek.inc (172.21.101.186) by mtkmbs10n2.mediatek.inc (172.21.101.183) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Wed, 14 Jun 2023 08:26:22 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs11n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Wed, 14 Jun 2023 08:26:22 +0800 From: Ed Tsai To: CC: , , , , , , , , , , , , , , , , Ed Tsai Subject: [PATCH v3] blk-mq: check on cpu id when there is only one ctx mapping Date: Wed, 14 Jun 2023 08:25:29 +0800 Message-ID: <20230614002529.6636-1-ed.tsai@mediatek.com> X-Mailer: git-send-email 2.18.0 MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" commit f168420c62e7 ("blk-mq: don't redirect completion for hctx withs only one ctx mapping") When nvme applies a 1:1 mapping of hctx and ctx, there will be no remote request. But for ufs, the submission and completion queues could be asymmetric. (e.g. Multiple SQs share one CQ) Therefore, 1:1 mapping of hctx and ctx won't complete request on the submission cpu. In this situation, this nr_ctx check could violate the QUEUE_FLAG_SAME_FORCE, as a result, check on cpu id when there is only one ctx mapping. Signed-off-by: Ed Tsai Signed-off-by: Po-Wen Kao Suggested-by: Keith Busch Reviewed-by: Christoph Hellwig --- block/blk-mq.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index 41f7e2b500bd..ecc30ebe9483 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1176,7 +1176,8 @@ bool blk_mq_complete_request_remote(struct request *r= q) * or a polled request, always complete locally, * it's pointless to redirect the completion. */ - if (rq->mq_hctx->nr_ctx =3D=3D 1 || + if ((rq->mq_hctx->nr_ctx =3D=3D 1 && + rq->mq_ctx->cpu =3D=3D raw_smp_processor_id()) || rq->cmd_flags & REQ_POLLED) return false; =20 --=20 2.18.0