On 2018/4/3 14:04, 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.
v2: fix some typos
v3: limit the print only for the same device
Suggested-by: Petr Mladek<pmla...@suse.com>
Suggested-by: Sergey Senozhatsky<sergey.senozhatsky.w...@gmail.com>
Signed-off-by: Wen Yang<wen.yan...@zte.com.cn>
Signed-off-by: Jiang Biao<jiang.bi...@zte.com.cn>
Signed-off-by: Tan Hu<tan...@zte.com.cn>
Reviewed-by: Bart Van Assche<bart.vanass...@wdc.com>
CC: BartVanAssche<bart.vanass...@wdc.com>
CC: Petr Mladek<pmla...@suse.com>
CC: Sergey Senozhatsky<sergey.senozhatsky.w...@gmail.com>
CC: Martin K. Petersen<martin.peter...@oracle.com>
CC: "James E.J. Bottomley"<j...@linux.vnet.ibm.com>
CC: Tejun Heo<t...@kernel.org>
CC: JasonYan<yanai...@huawei.com>
In my machine it works fine.
Tested-by: Jason Yan <yanai...@huawei.com>
