linux-kernel - Re: [PATCH] mm: kill page_queue

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Date:	Wed, 17 Dec 2008 12:39:50 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm: kill page_queue_congested()

On Wed, 2008-12-17 at 20:27 +0900, KOSAKI Motohiro wrote:
> ==
> Subject: [PATCH] mm: kill page_queue_congested()
> 
> page_queue_congested() was introduced at 2002.
> but it is unused until now at all.
> 
> it can be removed.

Or we can hook it up in vmscan, and skip congested pages on high scan
order or something..

> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> ---
>  mm/swapfile.c |   20 --------------------
>  1 file changed, 20 deletions(-)
> 
> Index: b/mm/swapfile.c
> ===================================================================
> --- a/mm/swapfile.c
> +++ b/mm/swapfile.c
> @@ -1203,26 +1203,6 @@ out:
>  	return ret;
>  }
>  
> -#if 0	/* We don't need this yet */
> -#include <linux/backing-dev.h>
> -int page_queue_congested(struct page *page)
> -{
> -	struct backing_dev_info *bdi;
> -
> -	BUG_ON(!PageLocked(page));	/* It pins the swap_info_struct */
> -
> -	if (PageSwapCache(page)) {
> -		swp_entry_t entry = { .val = page_private(page) };
> -		struct swap_info_struct *sis;
> -
> -		sis = get_swap_info_struct(swp_type(entry));
> -		bdi = sis->bdev->bd_inode->i_mapping->backing_dev_info;
> -	} else
> -		bdi = page->mapping->backing_dev_info;
> -	return bdi_write_congested(bdi);
> -}
> -#endif
> -
>  asmlinkage long sys_swapoff(const char __user * specialfile)
>  {
>  	struct swap_info_struct * p = NULL;
> 
> 
> --
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