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Enable ftrace in default kernel configs #120

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ddiss opened this issue Jan 20, 2020 · 1 comment
Open

Enable ftrace in default kernel configs #120

ddiss opened this issue Jan 20, 2020 · 1 comment

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@ddiss
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ddiss commented Jan 20, 2020

ftrace is a useful debugging utility, and can be configured with little impact on performance, with extra per-function NOPs added and used as tracing trampolines.

Building the SLE15SP2 kernel (I'd expect similar for mainline) with ftrace enabled results in the following size increase:
before: 4239920 ./arch/x86/boot/bzImage
after: 4870704 ./arch/x86/boot/bzImage
@morbidrsa
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Sounds like a good idea to me, at least on vanilla. I'm always having tracepoints enabled in my config

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@morbidrsa @ddiss