[dm-devel] [PATCH AUTOSEL 4.19 10/10] dm cache: add cond_resched() to various workqueue loops

[Sasha Levin]

From: Mike Snitzer <snit...@kernel.org>

[ Upstream commit 76227f6dc805e9e960128bcc6276647361e0827c ]

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

Signed-off-by: Mike Snitzer <snit...@kernel.org>
Signed-off-by: Sasha Levin <sas...@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 df7bc45bc0ced..b3371812a2158 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -1905,6 +1905,7 @@ static void process_deferred_bios(struct work_struct *ws)
 
                else
                        commit_needed = process_bio(cache, bio) || 
commit_needed;
+               cond_resched();
        }
 
        if (commit_needed)
@@ -1927,6 +1928,7 @@ 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();
        }
 }
 
@@ -1967,6 +1969,8 @@ static void check_migrations(struct work_struct *ws)
                r = mg_start(cache, op, NULL);
                if (r)
                        break;
+
+               cond_resched();
        }
 }
 
-- 
2.39.0

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