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btrfs: avoid monopolizing a core when activating a swap file

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commit 2c8507c63f5498d4ee4af404a8e44ceae4345056 upstream.

This commit re-attempts the backport of the change to the linux-5.4.y
branch. Commit 3d770d44dd ("btrfs: avoid monopolizing a core when
activating a swap file") on this branch was reverted.

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 <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Filipe Manana 2025-02-07 01:18:25 +09:00 • committed by Greg Kroah-Hartman
commit 41d3c605bf
1 changed files with 2 additions and 0 deletions
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2
fs/btrfs/inode.c
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@ -11079,6 +11079,8 @@ static int btrfs_swap_activate(struct swap_info_struct *sis, struct file *file,
}
start += len;
cond_resched();
}
if (bsi.block_len)