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btrfs: voluntarily relinquish cpu when doing a full fsync 

Doing a full fsync may require processing many leaves of metadata, which
can take some time and result in a task monopolizing a cpu for too long.
So add a cond_resched() after processing a leaf when doing a full fsync,
while not holding any locks on any tree (a subvolume or a log tree).

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2022-02-17 12:12:05 +00:00 committed by David Sterba
parent 5b7ce5e287
commit 96acb3753e
1 changed files with 7 additions and 0 deletions
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7
fs/btrfs/tree-log.c
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@ -5712,6 +5712,13 @@ next_key:
} else { } else {
break; break;
} }
/*
* We may process many leaves full of items for our inode, so
* avoid monopolizing a cpu for too long by rescheduling while
* not holding locks on any tree.
*/
cond_resched();
} }
if (ins_nr) { if (ins_nr) {
ret = copy_items(trans, inode, dst_path, path, ins_start_slot, ret = copy_items(trans, inode, dst_path, path, ins_start_slot,