Re: The performance impact of various debug options on Fedora Rawhide debug kernels

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On Fri, 2022-10-14 at 10:27 -0500, Justin Forbes wrote:
> 
> Just to reiterate this is not being dropped. I did a bit of research,
> CONFIG_DEBUG_WW_MUTEX_SLOWPATH was actually turned back on in 2018, as
> upstream changed PROVE_LOCKING to select it. As such, there is no way
> to turn it off without turning off PROVE_LOCKING.   All things
> considered, PROVE_LOCKING has found a good number of bugs over the
> years. From the numbers you have given, there doesn't seem to be a
> whole lot of opportunity for real improvement without turning off that
> chain.  Overall, this requires some thought on the rawhide debug
> strategy more than anything else.   We do have things (CKI and
> similar) which can give us more useful data without making a debug
> kernel default, but it still doesn't catch issues seen in hardware
> drivers so much. Though if debug kernels have gotten slow enough that
> no one is running them anymore, opting for the no-debug repo, we may
> be better served by changing our strategy here.

My personal experience when running Rawhide on my main laptops is that,
yeah, debug kernels are sufficiently slow that I will stick to booting
one of the periodic non-debug builds unless I'm specifically running
into a kernel bug and want to see if the debug kernel provides more
information on it.
-- 
Adam Williamson
Fedora QA
IRC: adamw | Twitter: adamw_ha
https://www.happyassassin.net

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