[Xen-devel] Re: [PATCH RFC 10/12] x86/pvticketlock: keep count of blocked cpus

[Peter Zijlstra <peterz@xxxxxxxxxxxxx>]

On Fri, 2010-07-16 at 18:03 -0700, Jeremy Fitzhardinge wrote:
> @@ -26,6 +26,9 @@ typedef struct arch_spinlock {
>                         __ticket_t head, tail;
>                 } tickets;
>         };
> +#ifdef CONFIG_PARAVIRT_SPINLOCKS
> +       __ticket_t waiting;
> +#endif
>  } arch_spinlock_t; 

This bloats spinlock_t from u32 to u64 on most distro configs I think,
since they'll have NR_CPUS=4096 or something large like that and
probably also want to have this PARAVIRT_SPINLOCKS thing.

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