Re: [PATCHv5 11/11] x86, mm: enable split page table lock for PMDlevel

[Steven Rostedt]

On Mon, Oct 07, 2013 at 04:54:13PM +0300, Kirill A. Shutemov wrote:
>  
>  config ARCH_HIBERNATION_HEADER
> diff --git a/arch/x86/include/asm/pgalloc.h b/arch/x86/include/asm/pgalloc.h
> index b4389a468f..e2fb2b6934 100644
> --- a/arch/x86/include/asm/pgalloc.h
> +++ b/arch/x86/include/asm/pgalloc.h
> @@ -80,12 +80,21 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
>  #if PAGETABLE_LEVELS > 2
>  static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
>  {
> -	return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
> +	struct page *page;
> +	page = alloc_pages(GFP_KERNEL | __GFP_REPEAT| __GFP_ZERO, 0);
> +	if (!page)
> +		return NULL;
> +	if (!pgtable_pmd_page_ctor(page)) {
> +		__free_pages(page, 0);
> +		return NULL;

Thanks for thinking about us -rt folks :-)

Yeah, this is good, as we can't put the lock into the page table.

Consider this and the previous patch:

Reviewed-by: Steven Rostedt <rostedt@xxxxxxxxxxx>

-- Steve

> +	}
> +	return (pmd_t *)page_address(page);
>  }
>  
>  static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
>  {
>  	BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
> +	pgtable_pmd_page_dtor(virt_to_page(pmd));
>  	free_page((unsigned long)pmd);
>  }
>  
> -- 
> 1.8.4.rc3
> 
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