Re: [PATCH 7/7] Opportunistically move mlocked pages off the LRU

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

On Wed, 14 Feb 2007 17:25:26 -0800 (PST)
Christoph Lameter <clameter@sgi.com> wrote:

> Opportunistically move mlocked pages off the LRU
> 
> Add a new function try_to_mlock() that attempts to
> move a page off the LRU and marks it mlocked.
> 
> This function can then be used in various code paths to move
> pages off the LRU immediately. Early discovery will make NR_MLOCK
> track the actual number of mlocked pages in the system more closely.
> 

How about adding this check ?

>  struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
> @@ -979,6 +1008,8 @@
>  			set_page_dirty(page);
>  		mark_page_accessed(page);
>  	}
> +	if (vma->vm_flags & VM_LOCKED)
> +		try_to_set_mlocked(page);

if (page != ZERO_PAGE(addres) && vma->vm_flags & VM_LOCKED)
		try_to_set_mlocked(pages);


I'm sorry if I misunderstand how ZERO_PAGE works.

-Kame

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