On Mon, Oct 10, 2011 at 09:58:06PM +0800, Bob Liu wrote:
> Currently THP do swap by default, user has no control of it.
> But some applications are swap sensitive, this patch add a boot param
> and sys file to make it configurable.
What's special about THP compared to regular-sized anon pages?
> @@ -155,10 +156,11 @@ int add_to_swap(struct page *page)
> return 0;
>
> if (unlikely(PageTransHuge(page)))
> - if (unlikely(split_huge_page(page))) {
> - swapcache_free(entry, NULL);
> - return 0;
> - }
> + if(!transparent_hugepage_swap_disable())
> + if (unlikely(split_huge_page(page))) {
> + swapcache_free(entry, NULL);
> + return 0;
> + }
>
> /*
> * Radix-tree node allocations from PF_MEMALLOC contexts could
That will just prevent the splitting and then add the huge page to the
swap cache, for which it is not prepared.
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