OK, this is the way to fix for 8.0 and earlier. It is up to you about
8.1. I think we can handle the larger patch if we do another RC.
---------------------------------------------------------------------------
Tom Lane wrote:
> I wrote:
> > I think it would be possible to fix it in a less invasive way by taking
> > and releasing the ControlLock an extra time in SimpleLruReadPage and
> > SimpleLruWritePage. What's indeterminate about that is the performance
> > cost.
>
> Attached is an alternative patch that does it this way. I realized that
> we could use LWLockConditionalAcquire to usually avoid any extra lock
> traffic, so the performance cost may be negligible except under the very
> heaviest of loads. I still like the bigger patch for 8.2 and forward,
> because it's a lot cleaner, but this seems like a credible alternative
> for 8.1 and back branches.
>
> Comments?
>
> regards, tom lane
>
Content-Description: slru-race-2.patch
[ Type application/octet-stream treated as attachment, skipping... ]
--
Bruce Momjian | http://candle.pha.pa.us
pgman@candle.pha.pa.us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073
