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SubjectRe: [External] Re: [PATCH 2/2] sched: mark PRINTK_DEFERRED_CONTEXT_MASK in __schedule()
On (20/09/28 12:25), Peter Zijlstra wrote:
[..]
> > printk
> >   vprintk_emit
> >     console_unlock
> >       vt_console_print
> >         hide_cursor
> >           bit_cursor
> >             soft_cursor
> >               queue_work_on
> >                 __queue_work
> >                   try_to_wake_up
> >                     _raw_spin_lock
> >                       native_queued_spin_lock_slowpath
> >
> > Looks like it's introduced by this commit:
> >
> > eaa434defaca1781fb2932c685289b610aeb8b4b
> >
> > "drm/fb-helper: Add fb_deferred_io support"
>
> Oh gawd, yeah, all the !serial consoles are utter batshit.
>
> Please look at John's last printk rewrite, IIRC it farms all that off to
> a kernel thread instead of doing it from the printk() caller's context.

Not yet. Scheduler is still part of the printk() - either in the
form of !serial consoles or console_sem, or both.

-ss

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