Git pull on linux-next tree shows "Performing inexact rename detection"

[Prasanna Kumar T S M]

Doing "git pull" on linux-next tree always shows "Performing inexact
rename detection" for a very long time (more than a hour and going). It
also uses more than 1.5GB of RAM (out of 2GB RAM) in my system. Not able
to do any thing when this is happening - even maximising a window takes
2 minutes once such a situation is reached. I am killing the command
with a Ctrl + C as I am not able to do any work.

What is the reason for this? What it does internally? Is there any way
to circumvent this? I don't want to clone linux-next again (that seems
to be the worst case solution).
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