FROMLIST: mm: replace migrate_prep with lru_add_drain_all
Currently, migrate_prep is merely a wrapper of lru_cache_add_all.
There is not much to gain from having additional abstraction.
Use lru_add_drain_all instead of migrate_prep, which would be more
descriptive.
note: migrate_prep_local in compaction.c changed into lru_add_drain
to avoid CPU schedule cost with involving many other CPUs to keep
keep old behavior.
Bug: 180018981
Link: https://lore.kernel.org/linux-mm/20210310161429.399432-1-minchan@kernel.org/
Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Minchan Kim <minchan@google.com>
Change-Id: I1bd3fcb13993e8a7a7961ceec817ac17304364cb
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ad392b9..1dca2d2 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8519,7 +8519,7 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
if (cc->alloc_contig && cc->mode == MIGRATE_ASYNC)
max_tries = 1;
- migrate_prep();
+ lru_add_drain_all();
while (pfn < end || !list_empty(&cc->migratepages)) {
if (fatal_signal_pending(current)) {