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From: Peter Smith <smithpb2250@gmail.com>
Date: Wed, 15 Mar 2023 10:54:26 +1100
Message-ID: <CAHut+PtrD4xU4OPUB64ZK+DPDhfKn3zph=nDpEWUFFzUvMKo2w@mail.gmail.com>
Subject: Re: Add macros for ReorderBufferTXN toptxn
To: Amit Kapila <amit.kapila16@gmail.com>
Cc: vignesh C <vignesh21@gmail.com>, 
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
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On Tue, Mar 14, 2023 at 10:43=E2=80=AFPM Amit Kapila <amit.kapila16@gmail.c=
om> wrote:
>
> On Tue, Mar 14, 2023 at 12:37=E2=80=AFPM Peter Smith <smithpb2250@gmail.c=
om> wrote:
> >
> > Thanks for the review!
> >
> > On Mon, Mar 13, 2023 at 6:19=E2=80=AFPM vignesh C <vignesh21@gmail.com>=
 wrote:
> > ...
> >
> > > 4) We check if txn->toptxn is not null twice here both in if conditio=
n
> > > and in the assignment, we could retain the assignment operation as
> > > earlier to remove the 2nd check:
> > > -       if (txn->toptxn)
> > > -               txn =3D txn->toptxn;
> > > +       if (isa_subtxn(txn))
> > > +               txn =3D get_toptxn(txn);
> > >
> > > We could avoid one check again by:
> > > +       if (isa_subtxn(txn))
> > > +               txn =3D txn->toptxn;
> > >
> >
> > Yeah, that is true, but I chose not to keep the original assignment in
> > this case mainly because then it is consistent with the other changed
> > code ---  e.g. Every other direct member assignment/access of the
> > 'toptxn' member now hides behind the macros so I did not want this
> > single place to be the odd one out. TBH, I don't think 1 extra check
> > is of any significance, but it is not a problem to change like you
> > suggested if other people also want it done that way.
> >
>
> Can't we directly use rbtxn_get_toptxn() for this case? I think that
> way code will look neat. I see that it is not exactly matching the
> existing check so you might be worried but I feel the new code will
> achieve the same purpose and will be easy to follow.
>

OK. Done as suggested.

PSA v3.

------
Kind Regards,
Peter Smith.
Fujitsu Australia

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