linux-kernel - Re: [PATCH 1/3] scsi: hisi_sas: service v2 hw CQ ISR with tasklet

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Message-ID: <a103003d-51a0-eb2f-8a3d-0b75b24634d6@linaro.org>
Date:   Wed, 4 Jan 2017 09:18:36 +0800
From:   zhangfei <zhangfei.gao@...aro.org>
To:     John Garry <john.garry@...wei.com>, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com
Cc:     linuxarm@...wei.com, xuwei5@...ilicon.com, john.garry2@...l.dcu.ie,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        hanjun.guo@...aro.org
Subject: Re: [PATCH 1/3] scsi: hisi_sas: service v2 hw CQ ISR with tasklet



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 <john.garry@...wei.com>
> Reviewed-by: Xiang Chen <chenxiang66@...ilicon.com>
Reviewed-by: Zhangfei Gao <zhangfei.gao@...aro.org>