On Wed, 21 Jun 2006, Thomas Gleixner wrote:
What I mean is that we will then do the full priority inheritance boost with interrupts off.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.
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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