Re: [PATCH RFC] srcu: Yet more detail for srcu_readers_active_idx_check() comments

[Joel Fernandes]

On Wed, Dec 14, 2022 at 11:10 PM Joel Fernandes <joel@xxxxxxxxxxxxxxxxx> wrote:
>
> On Wed, Dec 14, 2022 at 11:07 PM Joel Fernandes <joel@xxxxxxxxxxxxxxxxx> wrote:
> >
> > On Wed, Dec 14, 2022 at 9:24 PM Paul E. McKenney <paulmck@xxxxxxxxxx> wrote:
> > > > I also did not get why you care about readers that come and ago (you
> > > > mentioned the first reader seeing incorrect idx and the second reader
> > > > seeing the right flipped one, etc). Those readers are irrelevant
> > > > AFAICS since they came and went, and need not be waited on , right?.
> > >
> > > The comment is attempting to show (among other things) that we don't
> > > need to care about readers that come and go more than twice during that
> > > critical interval of time during the counter scans.
> >
> > Why do we need to care about readers that come and go even once? Once
> > they are gone, they have already done an unlock() and their RSCS is
> > over, so they need to be considered AFAICS.
> >
>
> Aargh, I meant: "so they need to be considered AFAICS".

Trying again: "so they need not be considered AFAICS".

Anyway, my 1 year old son is sick so signing off for now. Thanks.


 - Joel