On Fri 2018-04-20 10:52:21, Sergey Senozhatsky wrote: > On (04/19/18 12:02), Petr Mladek wrote: > > On Thu 2018-04-19 10:42:50, Sergey Senozhatsky wrote: > > > We wake up klogd very late - only when current console_sem owner > > > is done pushing pending kernel messages to the serial/net consoles. > > > In some cases this results in lost syslog messages, because kernel > > > log buffer is a circular buffer and if we don't wakeup syslog long > > > enough there are chances that logbuf simply will wrap around. > > > > > > The patch moves the klog wake up call to vprintk_emit(), which is > > > the only legit way for a kernel message to appear in the logbuf, > > > right before we attempt to grab the console_sem (possibly spinning > > > on it waiting for the hand off) and call console drivers. > > > > The last two lines need an update. What about? > > Ah. Indeed! > > > "right after the attempt to handle consoles. As a result, klog > > will get waken either after flushing the new message to consoles > > or immediately when consoles are still busy with older messages." > > Looks good. Do you want me to resend the patch?
No need to resend. I could update the patch when pushing. I'll wait few more days to give people time to respond. Best Regards, Petr
