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FROMLIST: mm: replace migrate_prep with lru_add_drain_all

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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
This commit is contained in:
Minchan Kim
2021-03-11 15:14:15 -08:00
committed by Minchan Kim
parent a71a3e1ce6
commit 134ac2d4dc
6 changed files with 11 additions and 32 deletions
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2
mm/page_alloc.c
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@@ -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)) {