Date: Tue, 2 Aug 2016 17:35:04 -0400 From: Zaphod Beeblebrox <zbeeble@gmail.com> To: FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: How to get better debugging for the kernel. Message-ID: <CACpH0Mcw1oTatUX3d7gJ4ys=dAj_y9C9vF_g110MrHVEup4mjQ@mail.gmail.com>
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I have just filed bug 211535. I'd like to be more helpful, but I'm having some trouble with the level of optimization in the kernel. Much of kgdb's output tells me that the value I'm looking for has been optimized away. So... how do I compile a kernel or a module without optimization _and_ how badly will that affect the runtime of a lightly loaded server? My kernel is already compiled with -g. That tells me that I'm looking in zap_leaf.c (part of ZFS). Can I simply compile zap_leaf.c without optimization?
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