> Would it make sense to push the freed-by-RCU memory further up the
quoted text
> hierarchy, so that such memory is not mistaken for recently freed
> hot-in-cache memory?

Right now my impression is that it is not well understood why
the kmalloc makes the IPI that much slower. In theory a kmalloc
shouldn't be all that slow, it's essentially just a 
"disable interrupts; unlink object from cpu cache; enable interrupts"
with some window dressing. kfree() is similar.

Does it bounce a cache line on freeing perhaps?

-Andi
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