On Tue, Jul 26, 2016 at 05:36:49PM +0300, Grygorii Strashko wrote:
> On 07/26/2016 03:02 PM, Uwe Kleine-König wrote:
> >Hello,
> >
> >these patches are based on next-20160726. I didn't check yet how latency
> >improves by using these patches, but even if the improvment is small,
> >it's still a good idea to have them.
>
> Sry, but how this will affect on -RT? This is not a raw locks, so
> they will be converted to rt-mutexes which are sleepable.
> Or I've missed smth?
They are still locks after all. On -rt I saw for the relevant
application:
send package |
take lock |
write pckt to hw |
| rcv irq
| take lock
| schedule
drop lock |
schedule |
| get pckt from hw
| drop lock
So reducing the time a lock is taken reduces the chances that the lock
is contended for another thread which results in extra context switches.
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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