From patchwork Tue Sep 22 10:52:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: SeongJae Park X-Patchwork-Id: 11792167 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0AD736CB for ; Tue, 22 Sep 2020 10:53:33 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C88FD2396D for ; Tue, 22 Sep 2020 10:53:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="XamNyr8k" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C88FD2396D Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=amazon.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kKfuX-00021O-MZ; Tue, 22 Sep 2020 10:52:37 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kKfuW-00021J-KZ for xen-devel@lists.xenproject.org; Tue, 22 Sep 2020 10:52:36 +0000 X-Inumbo-ID: a7972d5d-168f-432e-b27b-5e49e6d4f801 Received: from smtp-fw-4101.amazon.com (unknown [72.21.198.25]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id a7972d5d-168f-432e-b27b-5e49e6d4f801; Tue, 22 Sep 2020 10:52:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1600771954; x=1632307954; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=aiJBVDikZ4ujUlt8UYpyM0mSMq9hUSVyyV0F7i7fx80=; b=XamNyr8kirR6iRmOpDlpWgrcFl7B/x7UkmVcjA0oyazYxUqMIciuOfeZ Bs3JnbSod+IecvhCEfhS9DLDQ91YuUAeH7r8pmsiWQ0K4+sTIKtd2QTkn atqJCEH4/c0W/MAzqr0UNK/ii3ZnvBOSA/1pci/HuAqip1IE2HU8dV/2d w=; 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 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 X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.29 List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" 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(-)