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btrfs: avoid monopolizing a core when activating a swap file

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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>
This commit is contained in:
Filipe Manana 2024-12-09 16:43:44 +00:00 committed by David Sterba
parent 9a45022a0e
commit 2c8507c63f
1 changed files with 2 additions and 0 deletions
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fs/btrfs/inode.c
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@ -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)