* Daniel Walker <[email protected]> wrote:
> > > I found this latency ~5 minutes after boot up, no load . It looks like
> > > vgacon_scroll() has a memset like operation which can grow.
> >
> > do you have PRINTK_IGNORE_LOGLEVEL enabled? If yes then much of the
> > printk code will run with interrupts disabled - hence non-preemptable.
> > PRINTK_IGNORE_LOGLEVEL is a debugging feature for developers. I have
> > added an extra explanation to the Kconfig, see below.
>
> I was just running a "make defconfig" and I enabled latency tracing .
> PRINTK_IGNORE_LOGLEVEL defaults to off (doesn't it?), and I didn't
> make any changes to it . Unless it get switched on by something else
> ..
>
> It looks like the logic might be reversed in release_console_sem() .
yeah, it is reversed. I 'fixed' it a couple of releases ago - but in
fact it was correct previously and i introduced this bug. I have fixed
this in my tree and have released -rt9 with the fix.
Ingo
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