Messages in this thread | | | Subject | Re: [PATCH -next] panic: complete the flush of the hard deadlock log messages to the serial port | From | "xuqiang (M)" <> | Date | Tue, 8 Dec 2020 16:34:53 +0800 |
| |
在 2020/11/24 11:22, xuqiang (M) 写道: > > 在 2020/11/24 3:52, Andrew Morton 写道: >> On Mon, 23 Nov 2020 13:13:59 +0000 Xu Qiang <xuqiang36@huawei.com> >> wrote: >> >>> when hardlockup_all_cpu_backtrace is on, and there are >>> a large number of cores in the system, it takes >>> a long time to output the hard deadlock logs of all cores >>> to the serial port. When the console_flush_on_panic function >>> in panic is executed, console_locked is still held. >>> As a result, garbled characters are displayed in the serial port log. >>> >>> To solve this problem, wait for a maximum of 10s for the serial port >>> to be released before console_flush_on_panic. >> Wouldn't it be better to wait until all the printing of all those >> backtraces has completed? >> >> >> . > > The fear that there may be some unexpected abnormal situation, > > resulting in the serial port has been occupied without release. > > > Thanks > > Xu. > Hi, Are there any other questions about this patch?
Thanks
Xu.
| |