[v2,04/11] btrfs: avoid monopolizing a core when activating a swap file

Commit Message

Filipe Manana Dec. 11, 2024, 3:05 p.m. UTC

From: Filipe Manana <[e-mail]>

During swap activation we iterate over the extents of a file and we can
have many thounsands of them, so we can end up in a busy loop monopolizing
a core. Avoid this by doing a voluntary reschedule after processing each
extent.

Signed-off-by: Filipe Manana <[e-mail]>
---
 fs/btrfs/inode.c | 2 ++
 1 file changed, 2 insertions(+)

Patch

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 5edc151c640d..283199d11642 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -10078,6 +10078,8 @@  static int btrfs_swap_activate(struct swap_info_struct *sis, struct file *file,
 			ret = -EINTR;
 			goto out;
 		}
+
+		cond_resched();
 	}
 
 	if (bsi.block_len)