Re: [PATCHv5 4/7] mm: pack compound_dtor and compound_order into one word in struct page

[Vlastimil Babka]

On 09/03/2015 02:35 PM, Kirill A. Shutemov wrote:
> The patch halves space occupied by compound_dtor and compound_order in
> struct page.
> 
> For compound_order, it's trivial long -> short conversion.
> 
> For get_compound_page_dtor(), we now use hardcoded table for destructor
> lookup and store its index in the struct page instead of direct pointer
> to destructor. It shouldn't be a big trouble to maintain the table: we
> have only two destructor and NULL currently.
> 
> This patch free up one word in tail pages for reuse. This is preparation
> for the next patch.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> Reviewed-by: Michal Hocko <mhocko@xxxxxxxx>

Acked-by: Vlastimil Babka <vbabka@xxxxxxx>

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