linux-kernel - Re: [PATCH v7 02/11] rcu: Make call

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Date:   Tue, 11 Oct 2022 13:44:59 -0400
From:   Joel Fernandes <joel@...lfernandes.org>
To:     paulmck@...nel.org
Cc:     rcu@...r.kernel.org, linux-kernel@...r.kernel.org,
        rushikesh.s.kadam@...el.com, urezki@...il.com,
        neeraj.iitr10@...il.com, frederic@...nel.org, rostedt@...dmis.org,
        youssefesmat@...gle.com, surenb@...gle.com
Subject: Re: [PATCH v7 02/11] rcu: Make call_rcu() lazy to save power

On Thu, Oct 6, 2022 at 3:11 PM Paul E. McKenney <paulmck@...nel.org> wrote:
[..]
> >  static bool rcu_nocb_try_bypass(struct rcu_data *rdp, struct rcu_head *rhp,
> > -                             bool *was_alldone, unsigned long flags)
> > +                             bool *was_alldone, unsigned long flags,
> > +                             bool lazy)
> >  {
> >       unsigned long c;
> >       unsigned long cur_gp_seq;
> >       unsigned long j = jiffies;
> >       long ncbs = rcu_cblist_n_cbs(&rdp->nocb_bypass);
> > +     bool bypass_is_lazy = (ncbs == READ_ONCE(rdp->lazy_len));
>
> In the alphabet, "b" comes before "c".  Picky, but it does make these
> things easier to find.  Which can be important when you are searching
> for all occurrences of something -- nice to be able to find the variable
> in alpha order without interrupting your search.

For this comment, I cannot reorder it because it will break as ncbs
needs to be defined before it is used. I will leave this one alone if
it is Ok with you.

I am OK with all the other comments.

Thanks.