From a1c3a19446a440c68e80e9c34c5f308ff58aac88 Mon Sep 17 00:00:00 2001 From: Filipe Manana Date: Mon, 9 Dec 2024 16:43:44 +0000 Subject: [PATCH] btrfs: avoid monopolizing a core when activating a swap file commit 2c8507c63f5498d4ee4af404a8e44ceae4345056 upstream. 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: Qu Wenruo Signed-off-by: Filipe Manana Signed-off-by: David Sterba Signed-off-by: Greg Kroah-Hartman --- fs/btrfs/inode.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index eba87f2936d2c..b9dfa1d2de254 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -7128,6 +7128,8 @@ noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len, ret = -EAGAIN; goto out; } + + cond_resched(); } btrfs_release_path(path); -- 2.47.3