From mboxrd@z Thu Jan 1 00:00:00 1970 From: zhangfei Subject: Re: [PATCH 1/3] scsi: hisi_sas: service v2 hw CQ ISR with tasklet Date: Wed, 4 Jan 2017 09:18:36 +0800 Message-ID: References: <1483446290-185084-1-git-send-email-john.garry@huawei.com> <1483446290-185084-2-git-send-email-john.garry@huawei.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <1483446290-185084-2-git-send-email-john.garry@huawei.com> Sender: linux-kernel-owner@vger.kernel.org To: John Garry , jejb@linux.vnet.ibm.com, martin.petersen@oracle.com Cc: linuxarm@huawei.com, xuwei5@hisilicon.com, john.garry2@mail.dcu.ie, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, hanjun.guo@linaro.org List-Id: linux-scsi@vger.kernel.org On 2017年01月03日 20:24, John Garry wrote: > Currently the all the slot processing for the completion > queue is done in ISR context. It is judged that the slot > processing can take a long time, especially when a SATA > NCQ completes (upto 32 slots). > > So, as a solution, defer the bulk of the ISR processing > to tasklet context. Each CQ will have its down tasklet. > > Signed-off-by: John Garry > Reviewed-by: Xiang Chen Reviewed-by: Zhangfei Gao