Messages in this thread | | | Date | Thu, 22 Mar 2012 14:36:10 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH] memcg: change behavior of moving charges at task move |
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On Wed, 21 Mar 2012 18:52:04 +0900 KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:
> static struct page *mc_handle_swap_pte(struct vm_area_struct *vma, > unsigned long addr, pte_t ptent, swp_entry_t *entry) > { > - int usage_count; > struct page *page = NULL; > swp_entry_t ent = pte_to_swp_entry(ptent); > > if (!move_anon() || non_swap_entry(ent)) > return NULL; > - usage_count = mem_cgroup_count_swap_user(ent, &page); > - if (usage_count > 1) { /* we don't move shared anon */ > - if (page) > - put_page(page); > - return NULL; > - } > +#ifdef CONFIG_SWAP > + /* > + * Avoid lookup_swap_cache() not to update statistics. > + */
I don't understand this comment - what is it trying to tell us?
> + page = find_get_page(&swapper_space, ent.val);
The code won't even compile if CONFIG_SWAP=n?
> +#endif > if (do_swap_account) > entry->val = ent.val; >
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