Received: by 2002:a25:868d:0:0:0:0:0 with SMTP id z13csp2010643ybk; Mon, 11 May 2020 09:41:06 -0700 (PDT) X-Google-Smtp-Source: APiQypI+pO6wzm7bJEv/ZlW++uZf09wBPRBamYms2D6LGU6SRTlTHqHDKDeqleqHkFtzs920qX4a X-Received: by 2002:a17:906:560b:: with SMTP id f11mr13152187ejq.264.1589215266132; Mon, 11 May 2020 09:41:06 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1589215266; cv=none; d=google.com; s=arc-20160816; b=u3IkJk2Aqytg4HN5HCndpMyXABi7dMIzLZwhv8zc3AIJdTGsSRG61rFHTSuB1qYszC W1WZXAMd87414vulwVdCZUekHDTcYfA5vzFT4QXDcAZiOB4SpcHRdkZfslxFQjjqEvHG 2fN6LiVXfmurFsQgfF4MS18uHkFdBOOqf3zuNXVqX+QVhGnt4MgrfemYFy0RZ9B99K+p KXYruHws02P2o+EmWKKRLUPtofFBRfD68+91t9au+XjAVkUh6DV/jN59EDL01m4v4nGx E/tAlP96sMQ1jwGpWr02fyMvikFYaKopXK4HGqiZxcuZ5VPp+zzDSbePsAD7KBOSCdsr Y+wg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :message-id:date:subject:cc:to:from; bh=Wu4UpiWeZ1PZFJBZFMjgWRep/1JBcuSilAew6/+df9Q=; b=0IMNAGdQVpXRft7TNsH+0C9UcFWJqKEDcC5/yfw6EBuVd9zFfLj34QaLNbW9bWAliI KyrXdtE2qKJ3MGJEitna+0fFRKGJR9wm2a7z2FZhhYP9aB4iVxlWPP+kL5xibgTXwZoQ bhPt5sR6mibfYLIEmwXHvNuBkCC5jQHBS5IFhVz8eJCpeBbsXGhz4p0Rb0Lh7+u5Y+hD rbmd1w9lXLqg1O1BoMKYHV5v1RC4j6mpZTf5Nvc2yylEvK9k5ScMM8haP1YO+VKviYjW k+fajiHpLpTVSn5kM8ql0qyki1CCz1HmE+LuxP2Lmlj6RfBCG0200aSuu38fbIsEm6ez APaQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=collabora.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id gg25si511387ejb.23.2020.05.11.09.40.42; Mon, 11 May 2020 09:41:06 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=collabora.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730642AbgEKQjR (ORCPT + 99 others); Mon, 11 May 2020 12:39:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59764 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729613AbgEKQjQ (ORCPT ); Mon, 11 May 2020 12:39:16 -0400 Received: from bhuna.collabora.co.uk (bhuna.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e3e3]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A6810C061A0C for ; Mon, 11 May 2020 09:39:16 -0700 (PDT) Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: krisman) with ESMTPSA id 5BD812A07F2 From: Gabriel Krisman Bertazi To: agk@redhat.com, snitzer@redhat.com Cc: dm-devel@redhat.com, linux-kernel@vger.kernel.org, song@kernel.org, breeves@redhat.com, mpatocka@redhat.com, khazhy@google.com, Gabriel Krisman Bertazi , kernel@collabora.com Subject: [PATCH v4 0/2] Historical Service Time Path Selector Date: Mon, 11 May 2020 12:39:08 -0400 Message-Id: <20200511163910.3778467-1-krisman@collabora.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, This fourth version of HST applies the suggestion from Mikulas Patocka to do the ktime_get_ns inside the mpath map_bio instead of generic device-mapper code. This means that struct dm_mpath_io gained another 64bit field. For the request-based case, we continue to use the block layer start time information. With this modification, I was able obtain similar performance on BIO to request-based multipath with HST on the benchmarks shared in v1. v3: https://www.redhat.com/archives/dm-devel/2020-April/msg00308.html v2: https://www.redhat.com/archives/dm-devel/2020-April/msg00270.html v1: https://www.redhat.com/archives/dm-devel/2020-April/msg00176.html Gabriel Krisman Bertazi (1): md: mpath: Pass IO start time to path selector Khazhismel Kumykov (1): md: mpath: Add Historical Service Time Path Selector drivers/md/Kconfig | 11 + drivers/md/Makefile | 1 + drivers/md/dm-historical-service-time.c | 561 ++++++++++++++++++++++++ drivers/md/dm-mpath.c | 12 +- drivers/md/dm-path-selector.h | 2 +- drivers/md/dm-queue-length.c | 2 +- drivers/md/dm-service-time.c | 2 +- 7 files changed, 585 insertions(+), 6 deletions(-) create mode 100644 drivers/md/dm-historical-service-time.c -- 2.26.2