On Tue 02-02-16 19:21:01, Kirill A. Shutemov wrote:
> Calling isolate_lru_page() is wrong and shouldn't happen, but it not
> nessesary fatal: the page just will not be isolated if it's not on LRU.
>
> Let's downgrade the VM_BUG_ON_PAGE() to WARN_RATELIMIT().
This will trigger for !CONFIG_DEBUG_VM as well which I am not sure is
necessary. I guess isolate_lru_page is not such a hot path so this would
be acceptable.
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Anyway
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
> ---
> mm/vmscan.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index eb3dd37ccd7c..71b1c29948db 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1443,7 +1443,7 @@ int isolate_lru_page(struct page *page)
> int ret = -EBUSY;
>
> VM_BUG_ON_PAGE(!page_count(page), page);
> - VM_BUG_ON_PAGE(PageTail(page), page);
> + WARN_RATELIMIT(PageTail(page), "trying to isolate tail page");
>
> if (PageLRU(page)) {
> struct zone *zone = page_zone(page);
> --
> 2.7.0
>
--
Michal Hocko
SUSE Labs
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