linux-kernel - Re: [RFC][PATCH 4/9] mm: slabs: reset page at free

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Date:	Tue, 14 Jan 2014 18:48:47 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Dave Hansen <dave@...1.net>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, penberg@...nel.org,
	cl@...ux-foundation.org
Subject: Re: [RFC][PATCH 4/9] mm: slabs: reset page at free

On Tue, 14 Jan 2014, Dave Hansen wrote:

> diff -puN include/linux/mm.h~slub-reset-page-at-free include/linux/mm.h
> --- a/include/linux/mm.h~slub-reset-page-at-free	2014-01-14 09:57:57.099666808 -0800
> +++ b/include/linux/mm.h	2014-01-14 09:57:57.110667301 -0800
> @@ -2076,5 +2076,16 @@ static inline void set_page_pfmemalloc(s
>  	page->index = pfmemalloc;
>  }
>  
> +/*
> + * Custom allocators (like the slabs) use 'struct page' fields
> + * for all kinds of things.  This resets the page's state so that
> + * the buddy allocator will be happy with it.
> + */
> +static inline void allocator_reset_page(struct page *page)

This is ambiguous as to what "allocator" you're referring to unless we 
look at the comment.  I think it would be better to name it 
slab_reset_page() or something similar.

> +{
> +	page->mapping = NULL;
> +	page_mapcount_reset(page);
> +}
> +
>  #endif /* __KERNEL__ */
>  #endif /* _LINUX_MM_H */
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