From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752200AbdBINzV (ORCPT ); Thu, 9 Feb 2017 08:55:21 -0500 Received: from mx2.suse.de ([195.135.220.15]:41582 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751600AbdBINzT (ORCPT ); Thu, 9 Feb 2017 08:55:19 -0500 From: Juergen Gross To: linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org Cc: boris.ostrovsky@oracle.com, Juergen Gross Subject: [PATCH v4 0/3] xen: optimize xenbus performance Date: Thu, 9 Feb 2017 14:39:55 +0100 Message-Id: <20170209133958.5932-1-jgross@suse.com> X-Mailer: git-send-email 2.10.2 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The xenbus driver used for communication with Xenstore (all kernel accesses to Xenstore and in case of Xenstore living in another domain all accesses of the local domain to Xenstore) is rather simple especially regarding multiple concurrent accesses: they are just being serialized in spite of Xenstore being capable to handle multiple parallel accesses. Clean up the external interface(s) of xenbus and optimize its performance by allowing multiple concurrent accesses to Xenstore. V4: - patch 3: correct xs_request_enter() - patch 3: correct xs_request_exit() as requested by Boris Ostrovsky V3: - patch 3: simplify coding as requested by Boris Ostrovsky V2: - patch 1: update commit message, re-add lost copyright - patch 3: address comments of Boris Ostrovsky: - guard xs_request_id by lock - move state struct definitions to the place where they are being used - rate limit some warnings - use barrier() instead of cpu_relax() - add/remove some comments - minor changes like naming of variables Juergen Gross (3): xen: clean up xenbus internal headers xen: modify xenstore watch event interface xen: optimize xenbus driver for multiple concurrent xenstore accesses drivers/block/xen-blkback/xenbus.c | 6 +- drivers/net/xen-netback/xenbus.c | 8 +- drivers/xen/cpu_hotplug.c | 5 +- drivers/xen/manage.c | 6 +- drivers/xen/xen-balloon.c | 2 +- drivers/xen/xen-pciback/xenbus.c | 2 +- drivers/xen/xenbus/xenbus.h | 135 +++++++ drivers/xen/xenbus/xenbus_client.c | 6 +- drivers/xen/xenbus/xenbus_comms.c | 315 +++++++++++++++-- drivers/xen/xenbus/xenbus_comms.h | 51 --- drivers/xen/xenbus/xenbus_dev_backend.c | 2 +- drivers/xen/xenbus/xenbus_dev_frontend.c | 213 ++++++----- drivers/xen/xenbus/xenbus_probe.c | 14 +- drivers/xen/xenbus/xenbus_probe.h | 88 ----- drivers/xen/xenbus/xenbus_probe_backend.c | 11 +- drivers/xen/xenbus/xenbus_probe_frontend.c | 17 +- drivers/xen/xenbus/xenbus_xs.c | 544 +++++++++++++---------------- drivers/xen/xenfs/super.c | 2 +- drivers/xen/xenfs/xenstored.c | 2 +- include/xen/xenbus.h | 18 +- 20 files changed, 835 insertions(+), 612 deletions(-) create mode 100644 drivers/xen/xenbus/xenbus.h delete mode 100644 drivers/xen/xenbus/xenbus_comms.h delete mode 100644 drivers/xen/xenbus/xenbus_probe.h -- 2.10.2