https://bugs.freedesktop.org/show_bug.cgi?id=99130
--- Comment #14 from Dorota Czaplejewicz <dorota.czaplejewicz at
collabora.co.uk> ---
# cat /proc/consoles
tty0 -WU (EC p ) 4:1
Upon further digging, the slow stack *seems* like this (may be wrong, the
tracing tool is less useful with huge numbers of calls):
console_unlock()
call_console_drivers.isra.0.constprop.15()
vt_console_print()
lf()
scrup()
fbcon_scroll()
fbcon_cursor()
fbcon_redraw.isra.17()
Inside of this, the delay is split up among many shorter calls, most time
occupied by fbcon_putcs -> bit_putcs -> cfb_imageblit.
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