[RFC] filter profiling

[Vincent Bernat]

 ❦ 29 août 2017 06:14 +0300, Lennert Buytenhek <buytenh at wantstofly.org> :

> Feedback appreciated!  (Better ideas also appreciated. :D)

Using USDT probes? You can attach arbitrary strings to them. I know perf
supports them (with a recent kernel) but I don't know how
exactly. However, with systemtap, it's dead easy to see them:

stap -e 'probe bird.* { print($$vars) }'

For implementation, see:
 https://github.com/vincentbernat/lldpd/commit/bdfe419389075af3cdfeadc78008a157afc2d5d7
 https://github.com/vincentbernat/lldpd/commit/140e34f057462d5ff7818ab4af368f055eaad4e3
-- 
Say what you mean, simply and directly.
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