> imagine being able to update user space libraries without a reboot
That's... a very weird criticism to level at Windows, considering that the advice I've seen for Linux is to reboot if you update glibc (which is very much a user space library).
That's... a very weird criticism to level at Windows, considering that the advice I've seen for Linux is to reboot if you update glibc (which is very much a user space library).
Having to constantly reboot my computer, or risk missing important security patches, was very annoying to me on Windows.
I've never had to reboot after updating glibc in years of using Linux, as far as I can remember.
Running programs will continue to use the libc version that was on disk when they started. They won't even know glibc was upgraded. If something is broken before rebooting, it'll stay broken after.
For a trivial change to glibc, it won't cause issues. But there's a lot of shared libraries and lots of different kinds of changes in different kinds of libraries that can happen.
I still haven't nailed if it was due to a shared library update, but just the other day, after running upgrades I was unable to su or sudo / authenticate as a user until after rebooting.
Firefox on Linux did not really enjoy being updated while running, as far as I remember; Chrome was fine with it, but only since it does some extra work to bypass the problem via its "zygote process": https://chromium.googlesource.com/chromium/src/+/main/docs/l...
This is absolutely not true for Linux kernel updating. While you won't be using the new kernel before rebooting, there's 0 risk in not rebooting, because there's exactly 1 version of the kernel running on the machine -- it's loaded into memory when your computer starts.
There's of course rare exceptions, like when a dynamically linked library you just installed depends on a minimum specific version of the Linux kernel you also just installed, but this is extremely rare in Linux land, as backwards compatibility of programs with older kernels is generally a given. "We do not break userspace"
Most distros leave the current running kernel and boot into the new one next time.
Some, like Arch, overwrite the kernel on an update, so modules can’t be loaded. It is a shock the first time you plug in a USB drive and nothing happens.