On Thu, 02 Aug 2007 19:18:43 +0100 Andy Whitcroft <[email protected]> wrote:
> @@ -458,8 +475,15 @@ static unsigned long shrink_page_list(struct list_head *page_list,
> if (page_mapped(page) || PageSwapCache(page))
> sc->nr_scanned++;
>
> - if (PageWriteback(page))
> - goto keep_locked;
> + may_enter_fs = (sc->gfp_mask & __GFP_FS) ||
> + (PageSwapCache(page) && (sc->gfp_mask & __GFP_IO));
> +
> + if (PageWriteback(page)) {
> + if (sync_writeback == PAGEOUT_IO_SYNC && may_enter_fs)
> + wait_on_page_writeback(page);
> + else
> + goto keep_locked;
> + }
this bit could do with a comment explaining the design decisions, please.
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