[RFC PATCH v2 05/18] sched: add task flag for preempt IRQ tracking
jikos at kernel.org
Tue May 24 09:02:43 AEST 2016
On Fri, 20 May 2016, Andy Lutomirski wrote:
> I think it would be negligible, at least for interrupts, since
> interrupts are already extremely expensive. But I don't love adding
> assembly code that makes them even slower. The real thing I dislike
> about this approach is that it's not a normal stack frame, so you need
> code in the unwinder to unwind through it correctly, which makes me
> think that you're not saving much complexity by adding the pushes.
I fail to see what is so special about the stack frame; it's in fact
It has added semantic value for "those who know", but the others will
(pretty much correctly) consider it to be a stackframe from a function
call, and be done with it.
What am I missing?
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