Re: [Xen-devel] [PATCH] xen: Send spinlock IPI to all waiters

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2013-02-15 at 10:52 +0000, Stefan Bader wrote:
> diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
> index 83e866d..f7a080e 100644
> --- a/arch/x86/xen/spinlock.c
> +++ b/arch/x86/xen/spinlock.c
> @@ -328,7 +328,6 @@ static noinline void xen_spin_unlock_slow(struct 
> xen_spinlock *xl)
>               if (per_cpu(lock_spinners, cpu) == xl) {
>                       ADD_STATS(released_slow_kicked, 1);
>                       xen_send_IPI_one(cpu, XEN_SPIN_UNLOCK_VECTOR);
> -                     break;

It would be more efficient to build a mask and use xen_send_IPI_mask().

Ian.



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