Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753284AbbD0RE1 (ORCPT ); Mon, 27 Apr 2015 13:04:27 -0400 Received: from mx1.redhat.com ([209.132.183.28]:41114 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753228AbbD0REY (ORCPT ); Mon, 27 Apr 2015 13:04:24 -0400 From: Vitaly Kuznetsov To: "K. Y. Srinivasan" Cc: Haiyang Zhang , devel@linuxdriverproject.org, linux-kernel@vger.kernel.org, Dexuan Cui Subject: [PATCH v2 0/6] Drivers: hv: vmbus: fair round robin algorithm for vmbus_get_outgoing_channel() Date: Mon, 27 Apr 2015 19:04:10 +0200 Message-Id: <1430154256-26853-1-git-send-email-vkuznets@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2092 Lines: 49 Changes in v2: - Address Dexuan's review comments: PATCH 3/6: s,channel,primary_channel; PATCH 4/6: add a forward declaration instead of moving code around; PATCH 6/6: fix an off-by-one - Change the algorithm in PATCH 6/6: Instead of a simple round robin we first try to find a (sub)channel with the current_cpu == target_cpu and we fallback to a round robin when we fail to find one. K. Y., Dexuan, can you please give it a spin in various testing environments you have? Thanks! Original description: This series is a continuation of the "Drivers: hv: vmbus: Use a round-robin algorithm for picking the outgoing channel" work. It is supposed to bring two significant changes: 1) Subchannels for a channel are distributed evenly across all vcpus we have. Currently we try to distribute all channels (including subchannels) across all vcpus, this approach doesn't guarantee that the particular channel's subchannels will be distributed in the same way as we process all offer requests in some random order. (Patch 05) 2) Channel picking based on the current vcpu is dropped from vmbus_get_outgoing_channel() in favor of a fair round robin. (Patch 06) (this is not true anymore, see 'Changes'). Patches 01 - 04 are cleanup/refactoring. Vitaly Kuznetsov (6): Drivers: hv: vmbus: unify calls to percpu_channel_enq() Drivers: hv: vmbus: briefly comment num_sc and next_oc Drivers: hv: vmbus: decrease num_sc on subchannel removal Drivers: hv: vmbus: move init_vp_index() call to vmbus_process_offer() Drivers: hv: vmbus: distribute subchannels among all vcpus Drivers: hv: vmbus: improve selection of an outgoing channel drivers/hv/channel_mgmt.c | 127 ++++++++++++++++++++++++++-------------------- include/linux/hyperv.h | 12 +++-- 2 files changed, 80 insertions(+), 59 deletions(-) -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/