Re: [PATCH 3/3] Revert "task_work: remove fifo ordering guarantee"

[Oleg Nesterov]

On 09/09, Linus Torvalds wrote:
>
> On Wed, Sep 9, 2015 at 6:16 AM, Oleg Nesterov <oleg@xxxxxxxxxx> wrote:
> >
> > Again, rightly or not I believe that FIFO makes task_work_add() more useful.
> > Perhaps I am wrong, so far I can only provide the artificial examples...
>
> I'd rather wait until somebody has a real use case. I hate adding
> infrastructure for "what if.." scenarios. We're better off if we can
> make do with minimal semantics (ie "there are no guarantees except
> that the work will be done before returning to user space") than with
> stronger semantics that people then perhaps start depending on even if
> they didn't really need them.

OK, I see. Thanks.

At least you seem to agree with 1-2, so if Al takes these changes we
can easily reconsider 3/3 later, if/when we have the new user which
needs FIFO.

Oleg.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/