lkml.org 
[lkml]   [2006]   [Sep]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108
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
=============================

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-09-15 23:45    [W:0.448 / U:0.400 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site