what is nvidia-uvm module

[jagdpanther]

I just emerged the latest stable nvidia-drivers (358.16-r1 -- update from 355.11-r2).
After the emerge I was getting some messages in /var/log/messages about a mismatch:

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kernel: NVRM: API mismatch: the client has the version 358.16, but\x0aNVRM: this kernel module has the version 355.11.  Please\x0aNVRM: make sure that this kernel module and all NVIDIA driver\x0aNVRM: components have the same version.

This should not be much of a problem. I switched to a console, killed xdm and tried to remove the old nvidia driver, planning to load the new:

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# lsmod | grep nvidia
nvidia               8608490  0
# modprobe -r nvidia
modprobe: FATAL: Module nvidia-uvm not found.

I don't know what nvidia-uvm is but thought a reboot may fix this.
After a reboot from a console window:

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# lsmod | grep nvidia
nvidia_modeset        700005  2
nvidia               8691502  36 nvidia_modeset
# /etc/init.d/xdm stop
 * Stopping xdm ...                                                                                                                                                                                                                                                           # lsmod | grep nvidia
nvidia_modeset        700005  0
nvidia               8691502  1 nvidia_modeset
# modprobe -r nvidia
modprobe: FATAL: Module nvidia-uvm not found.
modprobe: FATAL: Error running remove command for nvidia
# lsmod | grep nvidia
# modprobe nvidia
# lsmod | grep nvidia
nvidia               8691502  0
# /etc/init.d/xdm start
 * Setting up xdm ...                                                                                                                                                                                                                                                           
# lsmod | grep nvidia
nvidia_modeset        700005  2
nvidia               8691502  36 nvidia_modeset

According to the nvidia web site:

Added nvidia-uvm.ko, the NVIDIA Unified Memory kernel module, to the NVIDIA Linux driver package. This kernel module provides support for the new Unified Memory feature in an upcoming CUDA release.

Everything seems to work but there is no nvidia-uvm in /lib/modules/4.1.15-gentoo-r1/video:

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-rw-r--r-- 1 root root   976744 Jan 31 10:19 nvidia-modeset.ko
-rw-r--r-- 1 root root 12129976 Jan 31 10:19 nvidia.ko

Should I just ignore the complaint about not finding nvidia-uvm?

[Buffoon]

Did you build driver with USE=uvm ?

[jagdpanther]

No. I did not build with uvm use flag. I don't program in or use CUDA so didn't think I needed 'uvm'.

[jagdpanther]

Buffoon: Thanks. emerging nvidia-drivers with uvm use flag solves the issue. nvidia-uvm.ko now exists. nvidia-uvm is not loaded according to lsmod, but that error message is gone.

[Buffoon]

Surprisingly enough GIMP wants to use it.

[Naib]

Surprisingly enough GIMP wants to use it.

yer, the new beta for gimp was crashing due to no uvm... seems gimp is offloading (sort of good i guess...)