From: Mike Snitzer <snitzer@kernel.org>
Date: Thu, 16 Feb 2023 20:31:08 +0000 (-0500)
Subject: dm cache: add cond_resched() to various workqueue loops
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=8c5f6c6992412d9c4ae97fd33d266698313703a7;p=linux.git

dm cache: add cond_resched() to various workqueue loops

[ 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>
---

diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index abfe7e37b76f4..24cd28ea2c595 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -1813,6 +1813,7 @@ static void process_deferred_bios(struct work_struct *ws)
 
 		else
 			commit_needed = process_bio(cache, bio) || commit_needed;
+		cond_resched();
 	}
 
 	if (commit_needed)
@@ -1835,6 +1836,7 @@ 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();
 	}
 }
 
@@ -1875,6 +1877,8 @@ static void check_migrations(struct work_struct *ws)
 		r = mg_start(cache, op, NULL);
 		if (r)
 			break;
+
+		cond_resched();
 	}
 }