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[Xen-devel] Re: [PATCH 06/13] x86/ticketlock: add slowpath logic
- To: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
- From: Eric Northup <digitaleric@xxxxxxxxxx>
- Date: Fri, 2 Sep 2011 11:46:08 -0700
- Cc: Marcelo Tosatti <mtosatti@xxxxxxxxxx>, Nick Piggin <npiggin@xxxxxxxxx>, KVM <kvm@xxxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Andi Kleen <andi@xxxxxxxxxxxxxx>, Avi Kivity <avi@xxxxxxxxxx>, Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
- Delivery-date: Sat, 03 Sep 2011 20:07:30 -0700
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- List-id: Xen developer discussion <xen-devel.lists.xensource.com>
On Thu, Sep 1, 2011 at 5:54 PM, Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
> From: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
>
> Maintain a flag in both LSBs of the ticket lock which indicates whether
> anyone is in the lock slowpath and may need kicking when the current
> holder unlocks. The flags are set when the first locker enters
> the slowpath, and cleared when unlocking to an empty queue.
Are there actually two flags maintained? I only see the one in the
ticket tail getting set/cleared/tested.
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