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=-13.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 F3DDAC4727E for ; Tue, 22 Sep 2020 10:52:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A43E0239E5 for ; Tue, 22 Sep 2020 10:52:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="gPa/2lH6" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726539AbgIVKwf (ORCPT ); Tue, 22 Sep 2020 06:52:35 -0400 Received: from smtp-fw-4101.amazon.com ([72.21.198.25]:5742 "EHLO smtp-fw-4101.amazon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726419AbgIVKwf (ORCPT ); Tue, 22 Sep 2020 06:52:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1600771955; x=1632307955; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=aiJBVDikZ4ujUlt8UYpyM0mSMq9hUSVyyV0F7i7fx80=; b=gPa/2lH6P8YCaDBoOSzIK31GA0bISa1x0KpUxN/ixMiY2L/YN4BCIYrc 3RvIHbiNZVapKfU/4qFv3+jbZOzdLad9Cxaiwg1HScOlk6zBzBg78vNSl 7D433NeK/6hysew3aUOcnfOAwd10oGQQQGfk65RmEaZcDNa4GjUWrBqgv k=; X-IronPort-AV: E=Sophos;i="5.77,290,1596499200"; d="scan'208";a="55547558" Received: from iad12-co-svc-p1-lb1-vlan3.amazon.com (HELO email-inbound-relay-1a-e34f1ddc.us-east-1.amazon.com) ([10.43.8.6]) by smtp-border-fw-out-4101.iad4.amazon.com with ESMTP; 22 Sep 2020 10:52:34 +0000 Received: from EX13D31EUA004.ant.amazon.com (iad12-ws-svc-p26-lb9-vlan3.iad.amazon.com [10.40.163.38]) by email-inbound-relay-1a-e34f1ddc.us-east-1.amazon.com (Postfix) with ESMTPS id CB54FA05DE; Tue, 22 Sep 2020 10:52:31 +0000 (UTC) Received: from u3f2cd687b01c55.ant.amazon.com (10.43.162.35) by EX13D31EUA004.ant.amazon.com (10.43.165.161) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 22 Sep 2020 10:52:26 +0000 From: SeongJae Park To: , , CC: SeongJae Park , , , , , , , , Subject: [PATCH v2 0/3] xen-blk(back|front): Let users disable persistent grants Date: Tue, 22 Sep 2020 12:52:06 +0200 Message-ID: <20200922105209.5284-1-sjpark@amazon.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-Originating-IP: [10.43.162.35] X-ClientProxiedBy: EX13D14UWB003.ant.amazon.com (10.43.161.162) To EX13D31EUA004.ant.amazon.com (10.43.165.161) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: SeongJae Park Persistent grants feature provides high scalability. On some small systems, however, it could incur data copy overheads[1] and thus it is required to be disabled. But, there is no option to disable it. For the reason, this commit adds module parameters for disabling of the feature. [1] https://wiki.xen.org/wiki/Xen_4.3_Block_Protocol_Scalability Baseline and Complete Git Trees =============================== The patches are based on the v5.9-rc6. You can also clone the complete git tree: $ git clone git://github.com/sjp38/linux -b pgrants_disable_v2 The web is also available: https://github.com/sjp38/linux/tree/pgrants_disable_v2 Patch History ============= Changes from v1 (https://lore.kernel.org/linux-block/20200922070125.27251-1-sjpark@amazon.com/) - use 'bool' parameter type (Jürgen Groß) - Let blkfront can also disable the feature from its side (Roger Pau Monné) - Avoid unnecessary xenbus_printf (Roger Pau Monné) - Update frontend parameter doc SeongJae Park (3): xen-blkback: add a parameter for disabling of persistent grants xen-blkfront: add a parameter for disabling of persistent grants xen-blkfront: Apply changed parameter name to the document .../ABI/testing/sysfs-driver-xen-blkback | 9 ++++++ .../ABI/testing/sysfs-driver-xen-blkfront | 11 +++++++- drivers/block/xen-blkback/xenbus.c | 28 ++++++++++++++----- drivers/block/xen-blkfront.c | 28 +++++++++++++------ 4 files changed, 60 insertions(+), 16 deletions(-) -- 2.17.1