Hello
On 12/06/2013 04:41 PM, Joonsoo Kim wrote:
> Some part of putback_lru_pages() and putback_movable_pages() is
> duplicated, so it could confuse us what we should use.
> We can remove putback_lru_pages() since it is not really needed now.
> This makes us undestand and maintain the code more easily.
>
> And comment on putback_movable_pages() is stale now, so fix it.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo....@lge.com>
>
> diff --git a/include/linux/migrate.h b/include/linux/migrate.h
> index f5096b5..7782b74 100644
> --- a/include/linux/migrate.h
> +++ b/include/linux/migrate.h
> @@ -35,7 +35,6 @@ enum migrate_reason {
>
> #ifdef CONFIG_MIGRATION
>
> -extern void putback_lru_pages(struct list_head *l);
> extern void putback_movable_pages(struct list_head *l);
> extern int migrate_page(struct address_space *,
> struct page *, struct page *, enum migrate_mode);
> @@ -59,7 +58,6 @@ extern int migrate_page_move_mapping(struct address_space
> *mapping,
> #else
>
> static inline void putback_lru_pages(struct list_head *l) {}
If you want to remove the function, this should be removed, right?
> -static inline void putback_movable_pages(struct list_head *l) {}
> static inline int migrate_pages(struct list_head *l, new_page_t x,
> unsigned long private, enum migrate_mode mode, int reason)
> { return -ENOSYS; }
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index b7c1716..1debdea 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -1569,7 +1569,13 @@ static int __soft_offline_page(struct page *page, int
> flags)
> ret = migrate_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL,
> MIGRATE_SYNC, MR_MEMORY_FAILURE);
> if (ret) {
> - putback_lru_pages(&pagelist);
> + if (!list_empty(&pagelist)) {
> + list_del(&page->lru);
> + dec_zone_page_state(page, NR_ISOLATED_ANON +
> + page_is_file_cache(page));
> + putback_lru_page(page);
> + }
> +
> pr_info("soft offline: %#lx: migration failed %d, type
> %lx\n",
> pfn, ret, page->flags);
> if (ret > 0)
> diff --git a/mm/migrate.c b/mm/migrate.c
> index 1f59ccc..8392de4 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -71,28 +71,12 @@ int migrate_prep_local(void)
> }
>
> /*
> - * Add isolated pages on the list back to the LRU under page lock
> - * to avoid leaking evictable pages back onto unevictable list.
> - */
> -void putback_lru_pages(struct list_head *l)
> -{
> - struct page *page;
> - struct page *page2;
> -
> - list_for_each_entry_safe(page, page2, l, lru) {
> - list_del(&page->lru);
> - dec_zone_page_state(page, NR_ISOLATED_ANON +
> - page_is_file_cache(page));
> - putback_lru_page(page);
> - }
> -}
> -
> -/*
> * Put previously isolated pages back onto the appropriate lists
> * from where they were once taken off for compaction/migration.
> *
> - * This function shall be used instead of putback_lru_pages(),
> - * whenever the isolated pageset has been built by
> isolate_migratepages_range()
> + * This function shall be used whenever the isolated pageset has been
> + * built from lru, balloon, hugetlbfs page. See isolate_migratepages_range()
> + * and isolate_huge_page().
> */
> void putback_movable_pages(struct list_head *l)
> {
> @@ -1697,6 +1681,12 @@ int migrate_misplaced_page(struct page *page, struct
> vm_area_struct *vma,
> nr_remaining = migrate_pages(&migratepages, alloc_misplaced_dst_page,
> node, MIGRATE_ASYNC, MR_NUMA_MISPLACED);
> if (nr_remaining) {
> + if (!list_empty(&migratepages)) {
> + list_del(&page->lru);
> + dec_zone_page_state(page, NR_ISOLATED_ANON +
> + page_is_file_cache(page));
> + putback_lru_page(page);
> + }
> putback_lru_pages(&migratepages);
> isolated = 0;
> } else
>
--
Thanks.
Zhang Yanfei
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