From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f176.google.com (mail-pd0-f176.google.com [209.85.192.176]) by kanga.kvack.org (Postfix) with ESMTP id 29E616B003D for ; Fri, 6 Dec 2013 04:06:26 -0500 (EST) Received: by mail-pd0-f176.google.com with SMTP id w10so681236pde.35 for ; Fri, 06 Dec 2013 01:06:25 -0800 (PST) Received: from song.cn.fujitsu.com ([222.73.24.84]) by mx.google.com with ESMTP id sj5si35145055pab.226.2013.12.06.01.06.23 for ; Fri, 06 Dec 2013 01:06:24 -0800 (PST) Message-ID: <52A191D3.5050507@cn.fujitsu.com> Date: Fri, 06 Dec 2013 16:58:59 +0800 From: Zhang Yanfei MIME-Version: 1.0 Subject: Re: [PATCH 3/4] mm/migrate: remove putback_lru_pages, fix comment on putback_movable_pages References: <1386319310-28016-1-git-send-email-iamjoonsoo.kim@lge.com> <1386319310-28016-3-git-send-email-iamjoonsoo.kim@lge.com> In-Reply-To: <1386319310-28016-3-git-send-email-iamjoonsoo.kim@lge.com> Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=UTF-8 Sender: owner-linux-mm@kvack.org List-ID: To: Joonsoo Kim Cc: Andrew Morton , Mel Gorman , Rik van Riel , Rafael Aquini , Naoya Horiguchi , Christoph Lameter , Joonsoo Kim , linux-kernel@vger.kernel.org, linux-mm@kvack.org 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 > > 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org