Andrew Morton <[email protected]> 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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