From: Mike Snitzer <snitzer@kernel.org>
Date: Thu, 16 Feb 2023 20:29:44 +0000 (-0500)
Subject: dm thin: add cond_resched() to various workqueue loops
X-Git-Tag: v4.14.308~99
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=341c77bbed7cf76465ea9d2db9a4ef37fd8c95ec;p=thirdparty%2Fkernel%2Fstable.git

dm thin: add cond_resched() to various workqueue loops

[ Upstream commit e4f80303c2353952e6e980b23914e4214487f2a6 ]

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-thin.c b/drivers/md/dm-thin.c
index 6c7fa790c8ae6..fcf1eaafec72d 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -2233,6 +2233,7 @@ static void process_thin_deferred_bios(struct thin_c *tc)
 			throttle_work_update(&pool->throttle);
 			dm_pool_issue_prefetches(pool->pmd);
 		}
+		cond_resched();
 	}
 	blk_finish_plug(&plug);
 }
@@ -2316,6 +2317,7 @@ static void process_thin_deferred_cells(struct thin_c *tc)
 			else
 				pool->process_cell(tc, cell);
 		}
+		cond_resched();
 	} while (!list_empty(&cells));
 }