Date: Mon, 15 Jun 2015 09:50:40 -0400 From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org> To: Jason Unovitch <jason.unovitch@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: reload kernel without reboot? Message-ID: <44wpz56pxr.fsf@lowell-desk.lan> In-Reply-To: <CABW2x9p3Kq_-bhArq_UMf0G%2B3=d4z=XiQqX-kFVrpWHgqfVHeQ@mail.gmail.com> (Jason Unovitch's message of "Sun, 14 Jun 2015 15:48:19 -0400") References: <CAPkyVLwy_cW9fuY4CLgGtXKcLb7qeLNk9VdiHQA3OYy-rbq6ew@mail.gmail.com> <20150614182418.56857acc.freebsd@edvax.de> <CABW2x9p3Kq_-bhArq_UMf0G%2B3=d4z=XiQqX-kFVrpWHgqfVHeQ@mail.gmail.com>
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Jason Unovitch <jason.unovitch@gmail.com> writes: > On Jun 14, 2015 12:30 PM, "Polytropon" <freebsd@edvax.de> wrote: >> >> On Sun, 14 Jun 2015 13:24:59 +0430, takCoder wrote: >> > my question is: Is there a way to reload freebsd kernel in which i don't >> > need to restart to apply the changes? >> >> Probably not, because the kernel is the first thing the >> OS boot mechanism will load, and this is required at the >> earliest stage of OS booting for the kernel to work as >> intended. What you would need is to change the kernel >> binary content (after source change and compile run) >> both on disk and in memory, with all its location references >> and dependency resolutions so the result parts will work >> consistently again. I'd say that's a very hard task, nearly >> impossible. >> >> However, if you are able to move the things you want to >> "dynamically load and unload" into kernel modules - there >> might be a solution for you. Kernel modules can be dealt >> with easily using kldload and kldunload. However, the >> kernel itself cannot be unloaded and reloaded with those >> tools. > > That is worth a read. I'm sure if it were easy it would have been > implemented by now. A standard kernel comes with many hundreds of kernel modules. We don't know what you're working on specifically, but the building and loading and unloading of modules is not tricky.
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