linux-kernel - Re: [Page Allocator] when is init_per_zone_wmark_min called to first initialize the watermarks, reserved memory etc?

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Message-ID: <CABexPfFZ8LJxmsuiSOtejfVebrTRM3=ppW5hxbQgmgX04VdAOA@mail.gmail.com>
Date:	Tue, 6 Dec 2011 03:25:29 +0800
From:	zhihua che <zhihua.che@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: [Page Allocator] when is init_per_zone_wmark_min called to first
 initialize the watermarks, reserved memory etc?

2011/12/6 zhihua che <zhihua.che@...il.com>:
> 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.

Maybe I'm closer the truth:-)
I find this function is defined as a module entry function (I should'v
found this earlier). As far as I know module entry functions are
called at the end of start_kernel() by rest_init(), whereas page
allocator / buddy system is used before they are called. For example,
__get_free_pages() is called in kmem_cache_init() which in turn is
called in start_kernel() earlier than rest_init().

harvey
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