Re: [patch 2/3] mm: speculative get_page

[Christoph Lameter]

Looks like the NoNewRefs flag is mostly == 
spin_is_locked(mapping->tree_lock)? Would it not be better to check the 
tree_lock?


> --- linux-2.6.orig/mm/migrate.c
> +++ linux-2.6/mm/migrate.c
>  
> +	SetPageNoNewRefs(page);
>  	write_lock_irq(&mapping->tree_lock);

A dream come true! If this is really working as it sounds then we can 
move the SetPageNoNewRefs up and avoid the final check under 
mapping->tree_lock. Then keep SetPageNoNewRefs until the page has been 
copied. It would basically play the same role as locking the page.
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