Re: Why can't I set the priority of softirq-hrt? (Re: 2.6.17-rt1)

[Esben Nielsen]

On Wed, 21 Jun 2006, Thomas Gleixner wrote:

> On Wed, 2006-06-21 at 22:29 +0100, Esben Nielsen wrote:
> > > Find an version against the code in -mm below. Not too much tested yet.
> >
> > What if setscheduler is called from interrup context as in the hrt timers?
>
> It simply gets stuff going, nothing else.
What I mean is that we will then do the full priority inheritance boost 
with interrupts off.

Before setscheduler() was O(1), now it is O(<lock depth of what ever lock 
the target task might be locked on>).

This is not a problem for your use of setscheduler() as the task involved 
only can be blocked on kernel mutexes, but when the function is used on a 
userspace process the lock depth can be deep.


Esben


> 	tglx
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