Hi!

quoted

Swsusp is the main "is valid ram" user I have in mind here. It
wants to know whether or not it should save and restore the
memory of a given `struct page`.

Why can't it follow the rmap chain?

It is walking physical memory, not memory managment chains. I need
something like:

static int saveable(struct zone * zone, unsigned long * zone_pfn)
{
        unsigned long pfn = *zone_pfn + zone->zone_start_pfn;
        struct page * page;

        if (!pfn_valid(pfn))
                return 0;

        page = pfn_to_page(pfn);
        BUG_ON(PageReserved(page) && PageNosave(page));
        if (PageNosave(page))
                return 0;
        if (PageReserved(page) && pfn_is_nosave(pfn)) {
                pr_debug("[nosave pfn 0x%lx]", pfn);
                return 0;
        }
        if (PageNosaveFree(page))
                return 0;

        return 1;
}
								Pavel
-- 
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