Re: [PATCH 2.6.20-rc4 1/4] futex priority based wakeup

[Pierre Peiffer]

Pierre Peiffer a Ãcrit :
> Ulrich Drepper a Ãcrit :
> > I have never seen performance numbers for this.  If it is punishing
> > existing code in a measurable way I think it's not anacceptable default
> > behavior.

> May be, supposing it makes sense to respect the priority order only for 
> real-time pthreads, I can register all SCHED_OTHER threads to the same 
> MAX_RT_PRIO priotity ?

Moreover, the performance must be considered, sure, but after all, "man 
pthread_cond_broadcast" says:
<<
       If more than one  thread  is  blocked  on  a  condition  variable,  the
       scheduling  policy  shall  determine  the  order  in  which threads are
       unblocked.
>>

... this is not true today ...
(of course, "shall" does not mean "mandatory", I know ;-) )

--
Pierre
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