| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Cc: | Pg Hackers <pgsql-hackers(at)postgresql(dot)org>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
| Subject: | Re: btvacuumpage useless "orig_blkno" |
| Date: | 2011-11-21 22:19:13 |
| Message-ID: | 1321913906-sup-7098@alvh.no-ip.org |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
Excerpts from Simon Riggs's message of lun nov 21 19:11:21 -0300 2011:
> On Mon, Nov 21, 2011 at 10:03 PM, Alvaro Herrera
> <alvherre(at)alvh(dot)no-ip(dot)org> wrote:
> > I just noticed that btvacuumpage has two BlockNumber parameters -- blkno
> > and orig_blkno. The only caller passes them as the same value; the
> > header comments state that blkno would be different when recursing, but
> > actually the function implements recursion internally by way of a cute
> > "goto" trick. So it seems to me that the orig_blkno parameter is
> > useless -- we could just remove it.
> >
> > Unless I'm completely missing something?
>
> tail recursion - read comments at bottom of the function
Right, but we don't need to pass the value as a parameter, we can just
save it at the start of the function, as my proposed patch does, right?
--
Álvaro Herrera <alvherre(at)commandprompt(dot)com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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