Messages in this thread | | | Date | Fri, 21 Aug 2015 09:50:35 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH] x86/entry/64: Context-track syscalls before enabling interrupts |
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* Frederic Weisbecker <fweisbec@gmail.com> wrote:
> > I want to have a real hook to call that says "switch to IRQ context from > > CONTEXT_USER" or "switch to IRQ context from CONTEXT_KERNEL" (aka noop), but > > that doesn't currently exist. > > You're not answering _why_ you want that.
So we'd have a comprehensive, 100% coverage, self-sufficient set of callbacks that track the kernel's current context state at the points where the context switches actually occur - not just something cobbled together heterogenously. The low level x86 asm code was rather messy in this area, better organization would be welcome, I don't think we can overdo it.
( I'm assuming here that it can all be done for zero or negative cost, and that the result will be correct and won't hurt existing users in any fashion. )
Thanks,
Ingo
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