[Page Allocator] when is init_per_zone_wmark_min called to firstinitialize the watermarks, reserved memory etc?

[zhihua che]

Hi, everyone

        I'm reading the linux kernel codes, and now focusing on memory
management. I came across a simple problem:).
        I know the every zone keeps three water marks to control the
allocator's behavior and I find the three watermarks is initialized in
init_per_zone_wmark_min.
Unfortunately, I can't find when this function is called FIRSTduring
the kernel booting process. I searched the source codes using LXR and
cscope and got nothing.
I guess I missed something but I have no any idea.

harvey.
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