summaryrefslogtreecommitdiff
path: root/mm/compaction.c
diff options
context:
space:
mode:
authorOscar Salvador <osalvador@suse.de>2021-05-05 04:35:29 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-05-05 21:27:22 +0300
commitae37c7ff79f1f030e28ec76c46ee032f8fd07607 (patch)
treeb6a0aea4192aabff779eb3e8b891372480cfb009 /mm/compaction.c
parent369fa227c21949b22fd7374506c4992a0d7bb580 (diff)
downloadlinux-ae37c7ff79f1f030e28ec76c46ee032f8fd07607.tar.xz
mm: make alloc_contig_range handle in-use hugetlb pages
alloc_contig_range() will fail if it finds a HugeTLB page within the range, without a chance to handle them. Since HugeTLB pages can be migrated as any LRU or Movable page, it does not make sense to bail out without trying. Enable the interface to recognize in-use HugeTLB pages so we can migrate them, and have much better chances to succeed the call. Link: https://lkml.kernel.org/r/20210419075413.1064-7-osalvador@suse.de Signed-off-by: Oscar Salvador <osalvador@suse.de> Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: David Hildenbrand <david@redhat.com> Cc: Muchun Song <songmuchun@bytedance.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/compaction.c')
-rw-r--r--mm/compaction.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/mm/compaction.c b/mm/compaction.c
index b77e1382307f..335862f1661c 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -907,7 +907,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
}
if (PageHuge(page) && cc->alloc_contig) {
- ret = isolate_or_dissolve_huge_page(page);
+ ret = isolate_or_dissolve_huge_page(page, &cc->migratepages);
/*
* Fail isolation in case isolate_or_dissolve_huge_page()
@@ -921,6 +921,15 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
goto isolate_fail;
}
+ if (PageHuge(page)) {
+ /*
+ * Hugepage was successfully isolated and placed
+ * on the cc->migratepages list.
+ */
+ low_pfn += compound_nr(page) - 1;
+ goto isolate_success_no_list;
+ }
+
/*
* Ok, the hugepage was dissolved. Now these pages are
* Buddy and cannot be re-allocated because they are
@@ -1062,6 +1071,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
isolate_success:
list_add(&page->lru, &cc->migratepages);
+isolate_success_no_list:
cc->nr_migratepages += compound_nr(page);
nr_isolated += compound_nr(page);