Message-ID: <51AA5950.6050603@goop.org>
Date: Sat, 01 Jun 2013 13:28:00 -0700
From: Jeremy Fitzhardinge <jeremy@goop.org>
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To: Andi Kleen <andi@firstfloor.org>
CC: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>, gleb@redhat.com,
        mingo@redhat.com, x86@kernel.org, konrad.wilk@oracle.com,
        hpa@zytor.com, pbonzini@redhat.com, linux-doc@vger.kernel.org,
        habanero@linux.vnet.ibm.com, xen-devel@lists.xensource.com,
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        ouyang@cs.pitt.edu, gregkh@suse.de, agraf@suse.de, chegu_vinod@hp.com,
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        virtualization@lists.linux-foundation.org,
        srivatsa.vaddagiri@gmail.com
Subject: Re: [PATCH RFC V9 0/19] Paravirtualized ticket spinlocks
References: <20130601082145.22955.33596.sendpatchset@codeblue> <20130601201442.GP6123@two.firstfloor.org>
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On 06/01/2013 01:14 PM, Andi Kleen wrote:
> FWIW I use the paravirt spinlock ops for adding lock elision
> to the spinlocks.

Does lock elision still use the ticketlock algorithm/structure, or are
they different?  If they're still basically ticketlocks, then it seems
to me that they're complimentary - hle handles the fastpath, and pv the
slowpath.

> This needs to be done at the top level (so the level you're removing)
>
> However I don't like the pv mechanism very much and would 
> be fine with using an static key hook in the main path
> like I do for all the other lock types.

Right.

    J
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