On Thu, Apr 12, 2018 at 12:59 PM, Mathieu Desnoyers
<mathieu.desnoyers@xxxxxxxxxxxx> wrote:
>
> What are your concerns about page pinning ?
Pretty much everything.
It's the most complex part by far, and the vmalloc space is a limited
resource on 32-bit architectures.
> Do you have an alternative approach in mind ?
Do everything in user space.
And even if you absolutely want cpu_opv at all, why not do it in the
user space *mapping* without the aliasing into kernel space?
The cpu_opv approach isn't even fast. It's *really* slow if it has to
do VM crap.
The whole rseq thing was billed as "faster than atomics". I
*guarantee* that the cpu_opv's aren't faster than atomics.
Linus
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