From: Jason Yan <yanaijie@huawei.com>
To: Wen Yang <wen.yang99@zte.com.cn>, <jejb@linux.vnet.ibm.com>,
<martin.petersen@oracle.com>
Cc: <linux-scsi@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<Bart.VanAssche@wdc.com>, <pmladek@suse.com>,
<sergey.senozhatsky.work@gmail.com>, <tj@kernel.org>,
<jiang.biao2@zte.com.cn>, <zhong.weidong@zte.com.cn>,
Tan Hu <tan.hu@zte.com.cn>
Subject: Re: [PATCH v2] scsi: Introduce sdev_printk_ratelimited to throttle frequent printk
Date: Mon, 2 Apr 2018 10:37:35 +0800 [thread overview]
Message-ID: <5AC1976F.1040801@huawei.com> (raw)
In-Reply-To: <1522634332-151328-1-git-send-email-wen.yang99@zte.com.cn>
Hi, Yang,
On 2018/4/2 9:58, Wen Yang wrote:
> There would be so many same lines printed by frequent printk 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 printk may be blocked for a
> long time, and if any spin_lock has been acquired before the printk
> like in scsi_request_fn, watchdog could be triggered.
>
> Related disscussion can be found here,
> https://bugzilla.kernel.org/show_bug.cgi?id=199003
> And Petr brought the idea to throttle the frequent printk, it's
> useless to print the same lines frequently after all.
>
It's true that this print for the same device is useless. But it's
useful for different devices. Is it possible to limit the print only
for the same device?
Thanks,
Jason
>
>
next prev parent reply other threads:[~2018-04-02 2:37 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-02 1:58 [PATCH v2] scsi: Introduce sdev_printk_ratelimited to throttle frequent printk Wen Yang
2018-04-02 2:10 ` Sergey Senozhatsky
[not found] ` <201804031419435288297@zte.com.cn>
2018-04-06 8:30 ` 答复: Re: [PATCH v2] scsi: Introduce sdev_printk_ratelimited to throttlefrequent printk Petr Mladek
2018-04-06 8:49 ` Petr Mladek
[not found] ` <201804091013439214247@zte.com.cn>
2018-04-09 8:59 ` 答复: Re: 答复: Re: [PATCH v2] scsi: Introduce sdev_printk_ratelimited tothrottlefrequent printk Petr Mladek
2018-04-02 2:37 ` Jason Yan [this message]
[not found] ` <201804021314481872986@zte.com.cn>
2018-04-02 5:29 ` 答复: Re: [PATCH v2] scsi: Introduce sdev_printk_ratelimited to throttlefrequent printk Sergey Senozhatsky
2018-04-02 6:07 ` Jason Yan
2018-04-02 6:06 ` Jason Yan
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