On (12/14/16 13:36), Petr Mladek wrote:
[..]
> [*] The async printk patchset is flying around in many
> modifications for years. I am more optimistic after
> the discussions on the last Kernel Summit. Anyway,
> it will not be in mainline before 4.12.
>
> [**] printk_deferred() only puts massages into the log
> buffer. It does not call
> console_trylock()/console_unlock(). Therefore,
> it is always "fast".
a small addition,
as a side effect, printk_deferred() guarantees that we will
attempt to console_unlock() from IRQ. CPU's pending bit stays
set until we run the irq work list on that CPU, per-CPU irq
work stays queued in per-CPU irq work list.
so, yes, printk_deferred() adds messages to logbuf, but in
exchange it says:
"I promise I will try to do console_unlock() from IRQ".
-ss
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