Commit 2c8507c6 authored by Filipe Manana's avatar Filipe Manana Committed by David Sterba
Browse files

btrfs: avoid monopolizing a core when activating a swap file 



During swap activation we iterate over the extents of a file and we can
have many thousands 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.

CC: stable@vger.kernel.org # 5.4+
Reviewed-by: default avatarQu Wenruo <wqu@suse.com>
Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 9a45022a

fs/btrfs/inode.c

+2 −0
Original line number Diff line number Diff line
@@ -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)