[ mail re-sent with lkml Cc:-ed. _Please_ Cc: all patches to lkml too!
Unless you want -rt to suffer the fate of -ck, keep upstream involved
all the time. The recent /proc/interrupts-all discussion with upstream
folks showed the clear benefits of that approach. ]
* Gregory Haskins <[email protected]> wrote:
> This code allows FUNCTION_CALL IPIs to become preemptible by executing
> them in kthread context instead of interrupt context. They are
> referred to as "Virtual Function Call IPIs" (VFCIPI) because we no
> longer rely on the actual FCIPI facility. Instead we schedule a
> thread to run. This essentially replaces the synchronous FCIPI with
> an async RESCHEDULE IPI.
why do we need this? It's quite complex and brings little extra AFAICS.
See the "schedule_on_each_cpu-enhance.patch" from Peter Ziljstra that
lets a function to be executed on all CPUs. That should be extended
(trivially) to execute a function on another CPU. That's all we need.
Ingo
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