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Date: Tue, 10 Dec 2013 18:00:13 +0900
From: Joonsoo Kim <iamjoonsoo.kim@....com>
To: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
Rafael Aquini <aquini@...hat.com>,
Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
Christoph Lameter <cl@...ux.com>, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, Vlastimil Babka <vbabka@...e.cz>,
Zhang Yanfei <zhangyanfei@...fujitsu.com>
Subject: Re: [PATCH v2 4/7] mm/migrate: remove putback_lru_pages, fix comment
on putback_movable_pages
On Tue, Dec 10, 2013 at 05:51:47PM +0900, Joonsoo Kim wrote:
> > >@@ -1704,6 +1688,12 @@ 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);
> >
> > You should remove this line. Otherwise,
>
> Yes, you are right. I will send next version. T_T
Here is the next version.
Thanks.
-----------8<------------------------
>From 5495abbe8ed8a39712d733b08110dcf97e0b53f5 Mon Sep 17 00:00:00 2001
From: Joonsoo Kim <iamjoonsoo.kim@....com>
Date: Fri, 6 Dec 2013 16:58:18 +0900
Subject: [PATCH v2-fix 4/7] mm/migrate: remove putback_lru_pages, fix comment
on putback_movable_pages
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.
Reviewed-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index f5096b5..e4671f9 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);
@@ -58,7 +57,6 @@ extern int migrate_page_move_mapping(struct address_space *mapping,
struct buffer_head *head, enum migrate_mode mode);
#else
-static inline void putback_lru_pages(struct list_head *l) {}
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)
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 b1cfd01..fa73ee3 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)
{
@@ -1704,7 +1688,12 @@ 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) {
- putback_lru_pages(&migratepages);
+ 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);
+ }
isolated = 0;
} else
count_vm_numa_event(NUMA_PAGE_MIGRATE);
--
1.7.9.5
--
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