diff options
authorOscar Salvador <>2019-02-01 14:19:57 -0800
committerLinus Torvalds <>2019-02-01 15:46:22 -0800
commit1723058eab19de741b80ac8ad25bfe2a00e02987 (patch)
parent5eeb63359b1ec4914d9898e24aa357ff930e6ee1 (diff)
mm, memory_hotplug: don't bail out in do_migrate_range() prematurely
do_migrate_range() takes a memory range and tries to isolate the pages to put them into a list. This list will be later on used in migrate_pages() to know the pages we need to migrate. Currently, if we fail to isolate a single page, we put all already isolated pages back to their LRU and we bail out from the function. This is quite suboptimal, as this will force us to start over again because scan_movable_pages will give us the same range. If there is no chance that we can isolate that page, we will loop here forever. Issue debugged in [1] has proved that. During the debugging of that issue, it was noticed that if do_migrate_ranges() fails to isolate a single page, we will just discard the work we have done so far and bail out, which means that scan_movable_pages() will find again the same set of pages. Instead, we can just skip the error, keep isolating as much pages as possible and then proceed with the call to migrate_pages(). This will allow us to do as much work as possible at once. [1] Michal said: : I still think that this doesn't give us a whole picture. Looping for : ever is a bug. Failing the isolation is quite possible and it should : be a ephemeral condition (e.g. a race with freeing the page or : somebody else isolating the page for whatever reason). And here comes : the disadvantage of the current implementation. We simply throw : everything on the floor just because of a ephemeral condition. The : racy page_count check is quite dubious to prevent from that. Link: Signed-off-by: Oscar Salvador <> Acked-by: Michal Hocko <> Cc: David Hildenbrand <> Cc: Dan Williams <> Cc: Jan Kara <> Cc: Kirill A. Shutemov <> Cc: William Kucharski <> Cc: Pavel Tatashin <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
1 files changed, 2 insertions, 16 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index b9a667d36c55..d7b7d221c284 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1344,7 +1344,6 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
unsigned long pfn;
struct page *page;
- int not_managed = 0;
int ret = 0;
@@ -1392,7 +1391,6 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
ret = isolate_movable_page(page, ISOLATE_UNEVICTABLE);
if (!ret) { /* Success */
- put_page(page);
list_add_tail(&page->lru, &source);
if (!__PageMovable(page))
inc_node_page_state(page, NR_ISOLATED_ANON +
@@ -1401,22 +1399,10 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
} else {
pr_warn("failed to isolate pfn %lx\n", pfn);
dump_page(page, "isolation failed");
- put_page(page);
- /* Because we don't have big zone->lock. we should
- check this again here. */
- if (page_count(page)) {
- not_managed++;
- ret = -EBUSY;
- break;
- }
+ put_page(page);
if (!list_empty(&source)) {
- if (not_managed) {
- putback_movable_pages(&source);
- goto out;
- }
/* Allocate a new page from the nearest neighbor node */
ret = migrate_pages(&source, new_node_page, NULL, 0,
@@ -1429,7 +1415,7 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
return ret;