linux-kernel - Re: [PATCH] scsi_lib: increase {host|target|device}

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Date:   Thu, 1 Mar 2018 23:11:02 +0000
From:   Bart Van Assche <Bart.VanAssche@....com>
To:     "jejb@...ux.vnet.ibm.com" <jejb@...ux.vnet.ibm.com>,
        "hch@....de" <hch@....de>,
        "opensource.ganesh@...il.com" <opensource.ganesh@...il.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] scsi_lib: increase {host|target|device}_busy count after
 dispatch cmd

On Mon, 2017-06-05 at 17:37 +0800, Ganesh Mahendran wrote:
> In android system, when there are lots of threads running. Thread A
> holding *host_busy* count is easily to be preempted, and if at the
> same time, thread B set *host_blocked*, then all other threads will
> be io blocked.

Hello Ganesh,

Have you considered to insert preempt_disable() and preempt_enable() calls
where necessary to achieve the same effect? I think that would result in a
much less intrusive patch.

Thanks,

Bart.