Re: [RFC] NUMA futex hashing

[Nick Piggin]

Ulrich Drepper wrote:

> > Of course we would need a new syscall, and to change glibc to be able to
> > actually use this new private_futex syscall.
>
>
> No, why?  The kernel already does recognize private mutexes.  It just
> checks whether the pages used to store it are private or mapped.  This
> requires some interaction with the memory subsystem but as long as no
> crashes happen the data can change underneath.  It's the program's
> fault if it does.


Because that requires taking mmap_sem. Avoiding that is the whole
purpose, isn't it?

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