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 X-Spam-Level: X-Spam-Status: No, score=-3.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY,USER_AGENT_GIT autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9C8B6C54E8D for ; Mon, 11 May 2020 16:39:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 860D720722 for ; Mon, 11 May 2020 16:39:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730653AbgEKQjR (ORCPT ); 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