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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 58761C433F5 for ; Mon, 18 Oct 2021 18:49:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3C51C61263 for ; Mon, 18 Oct 2021 18:49:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232181AbhJRSv2 (ORCPT ); Mon, 18 Oct 2021 14:51:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52940 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229924AbhJRSv2 (ORCPT ); Mon, 18 Oct 2021 14:51:28 -0400 Received: from mail-qt1-x82c.google.com (mail-qt1-x82c.google.com [IPv6:2607:f8b0:4864:20::82c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D6302C061745 for ; Mon, 18 Oct 2021 11:49:16 -0700 (PDT) Received: by mail-qt1-x82c.google.com with SMTP id t2so11685852qtn.12 for ; Mon, 18 Oct 2021 11:49:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:references:in-reply-to:mime-version:thread-index:date :message-id:subject:to:cc; bh=lnBWcDhNZKUje94VOmYBf9JhHIfnIL9iQI4NaqgzeeY=; b=Unj3RoiRTPTSninwMFTZP+mlcEmCOhleKR4OtjrbOqWmGj/RdkB7KczC0fPyfWEagp uFMmYEd5hRAJLHKHJ33yeWRPY6spwXWMjpM1T++fQJE26fzs6ahyn1VuvzSY3z4ZDQ7n pkAEyB9PrfXUVtcKArxw7XVCXaOWhTurpwcHs= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:references:in-reply-to:mime-version :thread-index:date:message-id:subject:to:cc; bh=lnBWcDhNZKUje94VOmYBf9JhHIfnIL9iQI4NaqgzeeY=; b=J7y73VRrBR8mrvWY/q3gbzZx5EIU3g38lFnvX2jzkJ8nZLdEjsVcQBDccHI4TLC8/E CmmvR6U3vYVpRfDJK32R4QsOSLGUkjkvVPaQvpEyddtVU7T+7ZhQ1Ye4aW2tuNEcxl4P 6PGMfoB3utnR5AYbry4kWgNcCb4asO+SRUaSufSJj0VnftAnYvCfoPjLCmHmRcNk4lHL jY9KivWbmyRohnpyquP5Ipatmiq+/RZnP5adlaIDqhMRE5Sy4Js1qDc64o18TKZfkj6N TTLdY8Gl06dyrGBCbTUqkbonuHVzEB/Ih5NBN3YWgmXNxIwHPXs3gox6rT9tSGsoFrRX Vpug== X-Gm-Message-State: AOAM532Lh1LpO8I+caSIxVY8sCjL8u/WfEynbycqOsFGuHsMA8yqR/dY LPEiyvqZY61pgAq4tlbZSu+qJ26oTbw2qNEt4vqETg== X-Google-Smtp-Source: ABdhPJzDemLt8tPJcmxdBmspqQm8W5ihY8RBWSmPgNgxo6Dv7iEcUySsbB8sFsAJHubEK4nQ5CY3TeQv2pNeHUYlKiY= X-Received: by 2002:ac8:56f9:: with SMTP id 25mr32129770qtu.374.1634582955895; Mon, 18 Oct 2021 11:49:15 -0700 (PDT) From: Kashyap Desai References: <1634550083-202815-1-git-send-email-john.garry@huawei.com> In-Reply-To: <1634550083-202815-1-git-send-email-john.garry@huawei.com> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 15.0 Thread-Index: AQH6ME5L8xUsgQGWU+HICvNEbBVHbquUQKoQ Date: Tue, 19 Oct 2021 00:19:13 +0530 Message-ID: <2f09315210261e82c42a1353cab48dcd@mail.gmail.com> Subject: RE: [PATCH v2] blk-mq: Fix blk_mq_tagset_busy_iter() for shared tags To: John Garry , axboe@kernel.dk Cc: ming.lei@redhat.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, hare@suse.de Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="00000000000076109505cea50030" Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org --00000000000076109505cea50030 Content-Type: text/plain; charset="UTF-8" > -----Original Message----- > From: John Garry [mailto:john.garry@huawei.com] > Sent: Monday, October 18, 2021 3:11 PM > To: axboe@kernel.dk > Cc: ming.lei@redhat.com; linux-block@vger.kernel.org; linux- > kernel@vger.kernel.org; kashyap.desai@broadcom.com; hare@suse.de; John > Garry > Subject: [PATCH v2] blk-mq: Fix blk_mq_tagset_busy_iter() for shared tags > > Since it is now possible for a tagset to share a single set of tags, the iter > function should not re-iter the tags for the count of #hw queues in that case. > Rather it should just iter once. > > Fixes: e0fdf846c7bb ("blk-mq: Use shared tags for shared sbitmap support") > Reported-by: Kashyap Desai > Signed-off-by: John Garry > Reviewed-by: Ming Lei > --- > Diff to v1: > - Add Ming's RB tag Now I noticed proper host_busy in my test. Still CPU hogging is not resolved, but issue addressed by this patch is resolved. 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