From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:36902 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727228AbeIRPpO (ORCPT ); Tue, 18 Sep 2018 11:45:14 -0400 From: Ming Lei To: linux-kernel@vger.kernel.org Cc: Ming Lei , Tejun Heo , Jianchao Wang , Kent Overstreet , linux-block@vger.kernel.org, Christoph Hellwig , linux-nvme@lists.infradead.org, Keith Busch Subject: [PATCH 0/3] blk-mq: allow to unfreeze queue when io isn't drained Date: Tue, 18 Sep 2018 18:13:07 +0800 Message-Id: <20180918101310.13154-1-ming.lei@redhat.com> Sender: linux-block-owner@vger.kernel.org List-Id: linux-block@vger.kernel.org Hi, The 1st patch introduces percpu_ref_resurge() for implementing blk_mq_unfreeze_queue_no_drain_io(). The 2nd patch introdces blk_mq_unfreeze_queue_no_drain_io() for cases in which queue can be unfreeze without draininig IO. The 3rd patch applies blk_mq_unfreeze_queue_no_drain_io() to NVMe PCI timeout, so that IO hang may be avoided inside nvme_reset_work() when new IO timeout is triggered. Part of idea is from Jianchao's early work: https://marc.info/?l=linux-kernel&m=153612052611020&w=2 Ming Lei (3): lib/percpu-refcount: introduce percpu_ref_resurge() blk-mq: introduce blk_mq_unfreeze_queue_no_drain_io nvme: don't drain IO in nvme_reset_work() block/blk-mq.c | 25 ++++++++++++++-- drivers/nvme/host/core.c | 12 +++++--- drivers/nvme/host/nvme.h | 2 +- drivers/nvme/host/pci.c | 3 +- include/linux/blk-mq.h | 1 + include/linux/percpu-refcount.h | 1 + lib/percpu-refcount.c | 63 ++++++++++++++++++++++++++++++++++------- 7 files changed, 87 insertions(+), 20 deletions(-) Cc: Tejun Heo Cc: Jianchao Wang Cc: Kent Overstreet Cc: linux-block@vger.kernel.org Cc: Christoph Hellwig Cc: linux-nvme@lists.infradead.org Cc: Keith Busch -- 2.9.5