Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754371AbbGPDTo (ORCPT ); Wed, 15 Jul 2015 23:19:44 -0400 Received: from mail-pd0-f181.google.com ([209.85.192.181]:36802 "EHLO mail-pd0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751322AbbGPDTm (ORCPT ); Wed, 15 Jul 2015 23:19:42 -0400 From: Ming Lei To: Jens Axboe , linux-kernel@vger.kernel.org Cc: Mike Snitzer , Tejun Heo Subject: [PATCH 0/4] block: account io: kill atomic operations Date: Thu, 16 Jul 2015 11:16:43 +0800 Message-Id: <1437016607-375-1-git-send-email-tom.leiming@gmail.com> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1035 Lines: 33 Hi, This patches kills two kinds of atomic operations in block accounting I/O. The 1st two patches convert atomic refcount of partition into percpu refcount. The 2nd two patches converts partition->in_flight[] into percpu variable. With this change, ~15% throughput improvement can be observed when running fio(randread) over null blk in a dual-socket environment. block/bio.c | 4 ++-- block/blk-core.c | 5 ++-- block/blk-merge.c | 2 +- block/genhd.c | 9 ++++--- block/partition-generic.c | 17 ++++++------- drivers/md/dm.c | 10 ++++---- drivers/nvdimm/core.c | 4 ++-- include/linux/genhd.h | 61 +++++++++++++++++++++++++++++++++-------------- 8 files changed, 72 insertions(+), 40 deletions(-) Thanks, Ming -- 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/