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

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Date:	Tue, 03 Aug 2010 10:32:40 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...e.de>,
	Jan Beulich <JBeulich@...ell.com>, Avi Kivity <avi@...hat.com>,
	Xen-devel <xen-devel@...ts.xensource.com>
Subject: Re: [PATCH RFC 10/12] x86/pvticketlock: keep count of blocked cpus

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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