[Devel] Re: [RFC v11][PATCH 05/13] Dump memory address space

[Dave Hansen]

On Thu, 2008-12-18 at 10:15 -0800, Mike Waychison wrote:
> 
> >>> +    pgarr = kzalloc(sizeof(*pgarr), GFP_KERNEL);
> >>> +    if (!pgarr)
> >>> +        return NULL;
> >>> +
> >>> +    pgarr->vaddrs = kmalloc(CR_PGARR_TOTAL * sizeof(unsigned
> long),
> >> You used PAGE_SIZE / sizeof(void *) above.   Why not
> __get_free_page()?
> > 
> > Hahaha .. well, it's a guaranteed method to keep Dave Hansen from
> > barking about not using kmalloc ...
> > 
> > Personally I prefer __get_free_page() here, but not enough to keep
> > arguing with him. Let me know when the two of you settle it :)
> 
> Alright, I just wasn't sure if it had been considered.

__get_free_page() sucks.  It doesn't do cool stuff like redzoning when
you have slab debugging turned on.  :)

I would personally suggest never using __get_free_page() unless you
truly need a *PAGE*.  That's an aligned, and PAGE_SIZE chunk.  If you
don't need alignment, or don't literally need a 'struct page', don't use
it.

-- Dave

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