Hi Thomas,
While I was working on adding the page headers to SLRU pages on your patch, I
came across this code where it seems like "MultiXactIdToMemberPage" is
mistakenly being used instead of MultiXactIdToOffsetPage in the TrimMultiXact
function.
Below is the area of concern in the patch:
@@ -2045,14 +1977,7 @@ TrimMultiXact(void)
oldestMXactDB = MultiXactState->oldestMultiXactDB;
LWLockRelease(MultiXactGenLock);
- /* Clean up offsets state */
- LWLockAcquire(MultiXactOffsetSLRULock, LW_EXCLUSIVE);
-
- /*
- * (Re-)Initialize our idea of the latest page number for offsets.
- */
- pageno = MultiXactIdToOffsetPage(nextMXact);
- MultiXactOffsetCtl->shared->latest_page_number = pag0eno;
+ pageno = MXOffsetToMemberPage(offset);
Let us know if I am missing something here or if it is an error.
Sincerely,
Rishu Bagga (Amazon Web Services)
On 9/16/22, 5:37 PM, "Thomas Munro" <thomas.mu...@gmail.com> wrote:
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Rebased, debugged and fleshed out a tiny bit more, but still with
plenty of TODO notes and questions. I will talk about this idea at
PGCon, so I figured it'd help to have a patch that actually applies,
even if it doesn't work quite right yet. It's quite a large patch but
that's partly because it removes a lot of lines...
