Thomas Gleixner wrote:
On Fri, 2006-09-15 at 21:10 +0200, Roman Zippel wrote:
this is being worked on actively: there's the "djprobes" patchset, which
includes a simplified disassembler to analyze common target code and can
thus insert much faster, call-a-trampoline-function based tracepoints
that are just as fast as (or faster than) compile-time, static
tracepoints.
Who is going to implement this for every arch?
Is this now the official party line that only archs, which implement all
of this, can make use of efficient tracing?
In the reverse you are enforcing an ugly - but available for all archs -
solution due to the fact that there is nobody interested enough to
implement it ?
????
If there's a solution people are willing to implement, and one
they aren't - doesn't that say something? Static tracepoint
patches for numerous architectures have existed and been maintained
out-of-tree for years.
If there is no interest to do that, then this arch can probably live w/o
instrumentation for the next decade too.
The arches already have instrumentation - just not dynamic
instrumentation. The reason static tracepoints have been
implemented and kprobes haven't is that static tracepoints
are sufficient for what those people are doing, and dynamic
tracepoints are a pain to implement.
Let me repeat that, just in case people missed it:
"Static tracepoints work for what I need." If other people
want to implement something fancier that works for them,
then feel free.
=============================
Tim Bird
Architecture Group Chair, CE Linux Forum
Senior Staff Engineer, Sony Electronics
=============================
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