Re: [RFC][PATCH 1/1] Expose per-node reclaim and migration to userspace

[Christoph Lameter <clameter@sgi.com>]

On Tue, 28 Nov 2006, menage@google.com wrote:

> +	for (i = 0; i < pgdat->node_spanned_pages; ++i) {
> +		struct page *page = pgdat_page_nr(pgdat, i);
> +		if (!isolate_lru_page(page, &pagelist)) {
> +			pagecount++;
> +		} else {
> +			failcount++;
> +		}
> +	}

Go along the active / inactive LRU lists? isolate_lru_page will not 
allow you isolate other pages.

If you go along the lru lists then you also avoid having to deal with 
holes in the memory map. You cannot simply assume that all struct pages in 
the area are accessible.


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