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

To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: [Xen-devel] Re: [PATCH RFC 10/12] x86/pvticketlock: keep count of blocked cpus
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Tue, 03 Aug 2010 10:32:40 +0200
Cc: Nick Piggin <npiggin@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>, Avi Kivity <avi@xxxxxxxxxx>
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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;
>         };
> +       __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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