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KHB: Dynamic Instrumentation of Production Systems (a.k.a. DTrace)

KHB: Dynamic Instrumentation of Production Systems (a.k.a. DTrace)

Posted Sep 14, 2006 3:48 UTC (Thu) by davej (subscriber, #354)
Parent article: KHB: Dynamic Instrumentation of Production Systems (a.k.a. DTrace)

> Whenever Dave Jones is trying to track down a memory allocation bug in
> Rawhide and turns on slab debugging, he's inundated with complaints about
> sluggish systems until he turns it back off again.

Actually SLAB_DEBUG isn't /that/ bad (or at least, people seem used to the hit when running rawhide. [Or maybe everyone has fast enough CPUs to make it not a big deal these days :) ]). The real killer that I get complaints from is CONFIG_DEBUG_PAGEALLOC. That one is only on as a last resort if I'm chasing something elusive that slab debug isn't shaking out.


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