[Linux-cachefs] Re: [PATCH 7/7] FS-Cache: CacheFiles: A cache that backs onto a mounted filesystem

[Andrew Morton]

David Howells <dhowells at redhat.com> wrote:
>
> +		/* let keventd have some air occasionally */
>  +		max--;
>  +		if (max < 0 || need_resched()) {
>  +			if (!list_empty(&object->read_list))
>  +				schedule_work(&object->read_work);
>  +			_leave(" [maxed out]");
>  +			return;
>  +		}

That's perhaps not a terribly effective way of multiplexing keventd cycles.
If someone has done a schedule_work(), that will stick an entry onto
keventd's worklist, but it won't necessarily set need_resched().

We'd need to extend the workqueue API to be able to determine whether
there's other work pending.