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Open Source and information security mailing list archives
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Date: Fri, 2 Sep 2011 11:46:08 -0700 From: Eric Northup <digitaleric@...gle.com> To: Jeremy Fitzhardinge <jeremy@...p.org> Cc: "H. Peter Anvin" <hpa@...or.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>, "the arch/x86 maintainers" <x86@...nel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Nick Piggin <npiggin@...nel.dk>, Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>, KVM <kvm@...r.kernel.org>, Andi Kleen <andi@...stfloor.org>, Xen Devel <xen-devel@...ts.xensource.com>, Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com> Subject: Re: [PATCH 06/13] x86/ticketlock: add slowpath logic On Thu, Sep 1, 2011 at 5:54 PM, Jeremy Fitzhardinge <jeremy@...p.org> wrote: > From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com> > > 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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