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RE: [RFC PATCH] thread_local_abi system call: caching current CPU number (x86)

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Mathieu Desnoyers wrote:
> Expose a new system call allowing threads to register a userspace memory
> area where to store the current CPU number. Scheduler migration sets the

I really like that this approach makes it easier to add a per-thread interaction between userspace and the kernel in the future.

>+       if (!tlap || t->thread_local_abi_len <
>+                       offsetof(struct thread_local_abi, cpu)
>+                       + sizeof(tlap->cpu))

Could you save a branch here by enforcing that thread_local_abi_len = 0 if thread_local_abi = null?

-b--
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[RFC PATCH] thread_local_abi system call: caching current CPU number (x86) Mathieu Desnoyers <mathieu.desnoyers@efficios.com> - 2015-07-16 22:10 +0200
  RE: [RFC PATCH] thread_local_abi system call: caching current CPU  number (x86) Ben Maurer <bmaurer@fb.com> - 2015-07-17 13:00 +0200
  Re: [RFC PATCH] thread_local_abi system call: caching current CPU  number (x86) Nikolay Borisov <n.borisov@siteground.com> - 2015-07-17 14:50 +0200

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