On 09/10/18 11:44, Peter Zijlstra wrote:

On Tue, Oct 09, 2018 at 11:24:26AM +0200, Juri Lelli wrote:

quoted

The main concerns I have with the current approach is that, being based
on mutex.c, it's both

 - not linked with futexes
 - not involving "legacy" priority inheritance (rt_mutex.c)

I believe one of the main reasons Peter started this on mutexes is to
have better coverage of potential problems (which I can assure everybody
it had). I'm not yet sure what should we do moving forward, and this is
exactly what I'd be pleased to hear your opinions on.

Well that, and mutex was 'simple', I didn't have to go rip out all the
legacy PI crud.

Indeed.

If this all ends up working well, the solution is 'simple' and we can
simply copy mutex to rt_mutex or something along those lines if we want
to keep the distinction between them. Alternatively we simply delete
rt_mutex.

Ah.. right.. sounds *scary*, but I guess it might be an option after
all.

Thanks for reviving this.. it's been an 'interesting' year and a half
since I wrote all this and I've really not had time to work on it.

n/p, it has been a long standing thing to look at for me as well. Thanks
again for sharing your patches!