Assistance with >~95% CPU usage when calling pread64 when using LUKS

[abraunegg]

Hi all,

I was wondering if I could seek some guidance on tracking an 
issue down.

As the current maintainer of the Linux OneDrive client 
(https://github.com/abraunegg) I have two open issues which are 
both high CPU, on Ubuntu, where both file systems reside on a 
LUKS encrypted volume.

* https://github.com/abraunegg/onedrive/issues/394
* https://github.com/abraunegg/onedrive/issues/404

Essentially, from the strace, it appears that the application is 
spending nearly all of it's time calling pread64.

Currently I am also not able to replicate this issue locally.

Is there any sort of extra debugging that I could do to 
understand what else is going on, or can you suggest any code 
changes which may improve the reading of files?

Any suggestions are greatly appreciated.