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SubjectRe: [RFC PATCH] thread_local_abi system call: caching current CPU number (x86)
----- On Jul 17, 2015, at 6:49 AM, Ben Maurer bmaurer@fb.com wrote:

> 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?

Yes, good idea! Will do.

Thanks!

Mathieu

--
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com


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