Sven-Thorsten Dietrich wrote:
On Thu, 2005-05-26 at 22:27 +0200, Andi Kleen wrote:
Here, I am talking about separating out the patch, and applying it
first, not dropping it from the RT implementation.
I really dislike the idea of interrupt threads. It seems totally
wrong to me to make such a fundamental operation as an interrupt
much slower. If really any interrupts take too long they should
move to workqueues instead and be preempted there. But keep
the basic fundamental operations fast please (at least that used to be one
of the Linux mottos that served it very well for many years, although more
and more people seem to forget it now)
IRQ threads are configurable. If you don't want them, you CAN turn them
off (if you have already turned them on).
You don't HAVE to turn them on.
Unless you have configured PREEMPT_RT which requires
PREEMPT_SOFTIRQS and PREEMPT_HARDIRQS such that
spinlock-mutexes are able to synchronize interrupt
processing. In other PREEMPT_* configuration modes
inclusion of IRQ threads is optional.
I think this may have been the source of confusion in
prior discussions.
-john
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