linux-kernel - Re: [PATCH] scsi: Introduce sdev_printk_ratelimited to throttle frequent printk

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Date:   Thu, 29 Mar 2018 23:56:05 +0000
From:   Bart Van Assche <Bart.VanAssche@....com>
To:     "jejb@...ux.vnet.ibm.com" <jejb@...ux.vnet.ibm.com>,
        "wen.yang99@....com.cn" <wen.yang99@....com.cn>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jiang.biao2@....com.cn" <jiang.biao2@....com.cn>,
        "zhong.weidong@....com.cn" <zhong.weidong@....com.cn>,
        "sergey.senozhatsky.work@...il.com" 
        <sergey.senozhatsky.work@...il.com>,
        "pmladek@...e.com" <pmladek@...e.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "tan.hu@....com.cn" <tan.hu@....com.cn>,
        "tj@...nel.org" <tj@...nel.org>
Subject: Re: [PATCH] scsi: Introduce sdev_printk_ratelimited to throttle
 frequent printk

On Wed, 2018-03-28 at 16:43 +0800, Wen Yang wrote:
> There would be so many same lines printed by frequent prink if one 
> disk went wrong, like,
> [  546.185242] sd 0:1:0:0: rejecting I/O to offline device
> [  546.185258] sd 0:1:0:0: rejecting I/O to offline device
> [  546.185280] sd 0:1:0:0: rejecting I/O to offline device
> [  546.185307] sd 0:1:0:0: rejecting I/O to offline device
> [  546.185334] sd 0:1:0:0: rejecting I/O to offline device
> [  546.185364] sd 0:1:0:0: rejecting I/O to offline device
> [  546.185390] sd 0:1:0:0: rejecting I/O to offline device
> [  546.185410] sd 0:1:0:0: rejecting I/O to offline device
> For slow serial console, the frequent prink may block the printk, and 
> if spin_lock was acquired before the printk like in scsi_request_fn,
> that could trigger the watchdog.
> 
> Relative disscussion can be found here,
  ^^^^^^^^
  Related?

Anyway:

Reviewed-by: Bart Van Assche <bart.vanassche@....com>