[PATCH AUTOSEL 6.2 56/60] dm cache: add cond_resched() to various workqueue loops

Sasha Levin
2023-02-27T03:08:43Z

From: Mike Snitzer <snitzer@kernel.org>

[ Upstream commit 76227f6dc805e9e960128bcc6276647361e0827c ]

Otherwise on resource constrained systems these workqueues may be too
greedy.

Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/md/dm-cache-target.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index 5e92fac90b675..17fde3e5a1f7b 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -1805,6 +1805,7 @@ static void process_deferred_bios(struct work_struct *ws)

else
commit_needed = process_bio(cache, bio) || commit_needed;
+ cond_resched();
}

if (commit_needed)
@@ -1827,6 +1828,7 @@ static void requeue_deferred_bios(struct cache *cache)
while ((bio = bio_list_pop(&bios))) {
bio->bi_status = BLK_STS_DM_REQUEUE;
bio_endio(bio);
+ cond_resched();
}
}

@@ -1867,6 +1869,8 @@ static void check_migrations(struct work_struct *ws)
r = mg_start(cache, op, NULL);
if (r)
break;
+
+ cond_resched();
}
}

--
2.39.0