linux-kernel - Re: [PATCH] Cleanup migrate case in try_to_unmap

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Date:	Thu, 13 May 2010 15:04:21 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Nitin Gupta <ngupta@...are.org>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH] Cleanup migrate case in try_to_unmap_one

> Remove duplicate handling of TTU_MIGRATE case for
> anonymous and filesystem pages.
> 
> Signed-off-by: Nitin Gupta <ngupta@...are.org>

This patch change swap cache case. I think this is not intentional.



> ---
>  mm/rmap.c |   17 ++++-------------
>  1 files changed, 4 insertions(+), 13 deletions(-)
> 
> diff --git a/mm/rmap.c b/mm/rmap.c
> index 07fc947..8ccfe4a 100644
> --- a/mm/rmap.c
> +++ b/mm/rmap.c
> @@ -946,6 +946,10 @@ int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
>  			dec_mm_counter(mm, MM_FILEPAGES);
>  		set_pte_at(mm, address, pte,
>  				swp_entry_to_pte(make_hwpoison_entry(page)));
> +	} else if (PAGE_MIGRATION && (TTU_ACTION(flags) == TTU_MIGRATION)) {
> +		swp_entry_t entry;
> +		entry = make_migration_entry(page, pte_write(pteval));
> +		set_pte_at(mm, address, pte, swp_entry_to_pte(entry));
>
>  	} else if (PageAnon(page)) {
>  		swp_entry_t entry = { .val = page_private(page) };
>  
> @@ -967,22 +971,9 @@ int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
>  			}
>  			dec_mm_counter(mm, MM_ANONPAGES);
>  			inc_mm_counter(mm, MM_SWAPENTS);
> -		} else if (PAGE_MIGRATION) {
> -			/*
> -			 * Store the pfn of the page in a special migration
> -			 * pte. do_swap_page() will wait until the migration
> -			 * pte is removed and then restart fault handling.
> -			 */
> -			BUG_ON(TTU_ACTION(flags) != TTU_MIGRATION);
> -			entry = make_migration_entry(page, pte_write(pteval));
>  		}
>  		set_pte_at(mm, address, pte, swp_entry_to_pte(entry));
>  		BUG_ON(pte_file(*pte));
> -	} else if (PAGE_MIGRATION && (TTU_ACTION(flags) == TTU_MIGRATION)) {
> -		/* Establish migration entry for a file page */
> -		swp_entry_t entry;
> -		entry = make_migration_entry(page, pte_write(pteval));
> -		set_pte_at(mm, address, pte, swp_entry_to_pte(entry));
>  	} else
>  		dec_mm_counter(mm, MM_FILEPAGES);
>  
> -- 
> 1.6.6.1
> 



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