Balbir Singh wrote:
> Hi, Pavel,
>
> I missed you on the list and the patch did not make it to lkml.
> I am resending the patch.
>
>
>
>
> ------------------------------------------------------------------------
>
>
>
> This patch fixes the bad_page() warning seen while freeing a container page.
> By default all container pages are added to the active list on the
> container. This patch lazily moves pages to the right list, so that a page
> on the active list of the zone LRU and the inactive list of the container
> does not get freed. If that happens, we see a warning from bad_page().
>
> Signed-off-by: Balbir Singh <[EMAIL PROTECTED]>
> ---
>
> linux/rss_container.h | 0
> mm/rss_container.c | 30 ++++++++++++++++++++++--------
> 2 files changed, 22 insertions(+), 8 deletions(-)
>
> diff -puN mm/rss_container.c~rss-fix-free-of-active-pages mm/rss_container.c
> --- linux-2.6.20/mm/rss_container.c~rss-fix-free-of-active-pages
> 2007-04-25 22:05:54.000000000 +0530
> +++ linux-2.6.20-balbir/mm/rss_container.c 2007-04-25 23:12:35.000000000
> +0530
> @@ -119,18 +119,36 @@ void container_rss_move_lists(struct pag
> }
>
> static unsigned long isolate_container_pages(unsigned long nr_to_scan,
> - struct list_head *src, struct list_head *dst,
> - unsigned long *scanned, struct zone *zone)
> + struct rss_container *rss, struct list_head *dst,
> + unsigned long *scanned, struct zone *zone, bool active)
> {
> unsigned long nr_taken = 0;
> struct page *page;
> struct page_container *pc;
> unsigned long scan;
> + struct list_head *src;
> LIST_HEAD(pc_list);
>
> + src = active ? &rss->active_list : &rss->inactive_list;
> +
> for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) {
> pc = list_entry(src->prev, struct page_container, list);
> page = pc->page;
> +
> + /*
> + * We might have got our active, inactive lists
> + * incorrect, fix it here
> + */
Hm... Did you see such a situation in your experiments?
If yes, then why not fix it in a normal way by moving the
pages from list to list where appropriate?
> + if (active && !PageActive(page)) {
> + list_move(&pc->list, &rss->inactive_list);
> + scan--;
> + continue;
> + } else if (!active && PageActive(page)) {
> + list_move(&pc->list, &rss->active_list);
> + scan--;
> + continue;
> + }
> +
> if (page_zone(page) != zone)
> continue;
>
> @@ -158,12 +176,8 @@ unsigned long isolate_pages_in_container
> unsigned long ret;
>
> spin_lock(&rss->res.lock);
> - if (active)
> - ret = isolate_container_pages(nr_to_scan, &rss->active_list,
> - dst, scanned, zone);
> - else
> - ret = isolate_container_pages(nr_to_scan, &rss->inactive_list,
> - dst, scanned, zone);
> + ret = isolate_container_pages(nr_to_scan, rss, dst, scanned, zone,
> + active);
> spin_unlock(&rss->res.lock);
> return ret;
> }
> diff -puN include/linux/rss_container.h~rss-fix-free-of-active-pages
> include/linux/rss_container.h
> _
-
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