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    SubjectRe: [PATCH RFC 00/11] lock monitor: Separate features related to lock
    On Fri, Mar 19, 2010 at 08:56:00AM -0400, Mathieu Desnoyers wrote:
    > > Sure. My doubt is: currently with the upstream version, does the
    > > compiler tend to load the parameters to the stack before the branch is
    > > checked? Or is this a magic that jmp labels bring for whatever reason?
    >
    > Even without the static jump patching, the compiler takes care of putting the
    > stack setup after the branch is checked. That worked with a standard test on a
    > variable, with immediate values and should still work with asm gotos.


    Ok.



    > I already did some presentations around these question. You can refer to my OLS
    > 2008 slides, where I proposed static jump patching (ancestor of the asm gotos,
    > where I did the liveness analysis myself in the back of the compiler; good
    > enough for a prototype ;) ). Slide 11 discusses the branch vs stack setup
    > question:
    >
    > http://lttng.org/files/slides/desnoyers-talk-ols2008.pdf
    >
    > Even more in Sections 8.1, 8.2 and 8.3 of my thesis:
    >
    > http://lttng.org/files/thesis/desnoyers-dissertation-2009-12-v27.pdf
    >
    > 8.1 Kernel Markers
    > 8.2 Tracepoints
    > 8.3 Immediate Values


    Cool. I was already keeping your thesis on hand anyway :)

    Thanks.



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