But [LWN.net]

But

Posted Oct 7, 2011 12:01 UTC (Fri) by fuhchee (subscriber, #40059)
In reply to: But by robert_s
Parent article: Oracle works on Dtrace for Linux (The H)

Systemtap has not limited itself to dtrace capabilities as an end goal. It already exceeds it in some interesting ways, and we plan to keep that going.

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But

Posted Oct 8, 2011 19:02 UTC (Sat) by rahulsundaram (subscriber, #21946) [Link]

Adoption is very limited at this point and wont grow till it requires no kernel patches and everything is in the mainline kernel. That is a huge problem.

But

Posted Oct 8, 2011 19:30 UTC (Sat) by fuhchee (subscriber, #40059) [Link]

"till it requires no kernel patches"

I assume you're referring to utrace/uprobes. Yes, only probing general user-space requires these, and we can hardly wait until these are mainstream.

"and everything is in the mainline kernel"

If you're repeating the previous point, ok.
If you're suggesting that a tool must be distributed within the kernel tree in order to be useful, then considerable experience says otherwise.

But

Posted Oct 8, 2011 19:59 UTC (Sat) by rahulsundaram (subscriber, #21946) [Link]

Yes. Utrace/uprobes need to be merged. It doesn't matter much where the user space tool lives.