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    SubjectRe: [PATCH 4/5] kmemtrace: SLUB hooks.
    * Eduard - Gabriel Munteanu (eduard.munteanu@linux360.ro) wrote:
    > On Mon, Aug 11, 2008 at 05:22:37PM +0300, Pekka Enberg wrote:
    > > On Mon, 2008-08-11 at 09:21 -0500, Christoph Lameter wrote:
    > > > Pekka Enberg wrote:
    > > >
    > > > > The function call is supposed to go away when we convert kmemtrace to
    > > > > use Mathieu's markers but I suppose even then we have a problem with
    > > > > inlining?
    > > >
    > > > The function calls are overwritten with NOPs? Or how does that work?
    > >
    > > I have no idea. Mathieu, Eduard?
    >
    > Yes, the code is patched at runtime. But AFAIK markers already provide
    > this stuff (called "immediate values"). Mathieu's tracepoints also do
    > it. But it's not available on all arches. x86 and x86-64 work as far as
    > I remember.
    >

    The markers present in mainline kernel does not use immediate values.
    However, immediate values in tip does implement a load
    immediate/test/branch for x86, x86_64 and powerpc. I also have support
    for sparc64 in my lttng tree.

    Mathieu


    --
    Mathieu Desnoyers
    OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68


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