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    SubjectRe: [PATCH] markers-linker-generic
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    Andrew Morton <akpm@linux-foundation.org> writes:

    > [...] I am told that the systemtap developers plan to (or are)
    > using this infrastructure.

    Indeed.

    > If correct: what is their reason for preferring it over kprobes?
    > [...]

    It's not a preference - it's more of a supplement. It's helpful when
    some combination of such factors exists:

    - kprobe int3-fault dispatching overhead orders of magnitude too high
    - fault dispatching not permissible in some areas
    - local context variables not easily retrievable via dwarf information
    - dwarf information not available at all
    - costs of permanently placed but passive marker acceptable

    From systemtap's point of view, instrumentation hooked to markers,
    kprobes, and other facilities like timers, coexist just fine. A
    greater number of probe-able event sources makes for a richer tool.


    - FChE
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