Re: [Xen-devel] credit scheduler svc->flags access race?

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 05.01.12 at 03:36, "Liu.yi" <liu.yi24@xxxxxxxxxx> wrote:
> Atomic operations using LOCK prefix (like set_bit and clear_bit) will block
> all the physical cpus which excute memory access.

... to that same cache line.

> Does this fact implies
> that spin locks are more efficient when their's granularity is small?

No - after all, acquiring a spin lock unavoidably implies using a LOCKed
instruction.

Jan


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