On Tue, Dec 03, 2013 at 01:23:01PM +0400, Vladimir Davydov wrote:
> Actually, I'm not going to modify the list_lru structure, because I
> think it's good as it is. I'd like to substitute it with a new
> structure, memcg_list_lru, only in those places where this functionality
> (per-memcg scanning) is really needed. This new structure would look
> like this:
>
> struct memcg_list_lru {
> struct list_lru global_lru;
> struct list_lru **memcg_lrus;
> struct list_head list;
> void *old_lrus;
> }
>
> Since old_lrus and memcg_lrus can be NULL under normal operation, in
> memcg_list_lru_destroy() I'd have to check either the list or the
> global_lru field, i.e. it would look like:
>
> if (!list.next)
> /* has not been initialized */
> return;
>
> or
... or just use hlist_head.
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