Since commit cf66f0700c8f ("mm, compaction: do not consider a need to
reschedule as contention"), async compaction won't abort when scheduling
is needed. Correct the relevant comment accordingly.
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
---
mm/compaction.c | 11 ++++-------
mm/internal.h | 2 +-
2 files changed, 5 insertions(+), 8 deletions(-)
diff --git a/mm/compaction.c b/mm/compaction.c
index ee2ddf77191f..e839b26fb3d8 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -513,15 +513,12 @@ static bool compact_lock_irqsave(spinlock_t *lock, unsigned long *flags,
* very heavily contended. The lock should be periodically unlocked to avoid
* having disabled IRQs for a long time, even when there is nobody waiting on
* the lock. It might also be that allowing the IRQs will result in
- * need_resched() becoming true. If scheduling is needed, async compaction
- * aborts. Sync compaction schedules.
+ * need_resched() becoming true. If scheduling is needed, compaction schedules.
* Either compaction type will also abort if a fatal signal is pending.
* In either case if the lock was locked, it is dropped and not regained.
*
- * Returns true if compaction should abort due to fatal signal pending, or
- * async compaction due to need_resched()
- * Returns false when compaction can continue (sync compaction might have
- * scheduled)
+ * Returns true if compaction should abort due to fatal signal pending.
+ * Returns false when compaction can continue.
*/
static bool compact_unlock_should_abort(spinlock_t *lock,
unsigned long flags, bool *locked, struct compact_control *cc)
@@ -574,7 +571,7 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
/*
* Periodically drop the lock (if held) regardless of its
* contention, to give chance to IRQs. Abort if fatal signal
- * pending or async compaction detects need_resched()
+ * pending.
*/
if (!(blockpfn % SWAP_CLUSTER_MAX)
&& compact_unlock_should_abort(&cc->zone->lock, flags,
diff --git a/mm/internal.h b/mm/internal.h
index 48eb2d24fcd2..70cc61af06de 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -403,7 +403,7 @@ struct compact_control {
bool direct_compaction; /* False from kcompactd or /proc/... */
bool proactive_compaction; /* kcompactd proactive compaction */
bool whole_zone; /* Whole zone should/has been scanned */
- bool contended; /* Signal lock or sched contention */
+ bool contended; /* Signal lock contention */
bool rescan; /* Rescanning the same pageblock */
bool alloc_contig; /* alloc_contig_range allocation */
};
--
2.23.0
