v19-0009-Unset-all_visible-sooner-if-not-freezing.patch
text/x-patch
Filename: v19-0009-Unset-all_visible-sooner-if-not-freezing.patch
Type: text/x-patch
Part: 8
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Format: format-patch
Series: patch v19-0009
Subject: Unset all_visible sooner if not freezing
| File | + | − |
|---|---|---|
| src/backend/access/heap/pruneheap.c | 8 | 2 |
From 675c8aa69fd456dfee011d40c913f33cd866cab6 Mon Sep 17 00:00:00 2001 From: Melanie Plageman <melanieplageman@gmail.com> Date: Tue, 14 Oct 2025 15:22:35 -0400 Subject: [PATCH v19 09/12] Unset all_visible sooner if not freezing MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit In the prune/freeze path, we currently delay clearing all_visible and all_frozen in the presence of dead items to allow opportunistic freezing. However, if no freezing will be attempted, there’s no need to delay. Clearing the flags earlier avoids extra bookkeeping in heap_prune_record_unchanged_lp_normal(). This currently has no runtime effect because all callers that consider setting the VM also prepare freeze plans, but upcoming changes will allow on-access pruning to set the VM without freezing. The extra bookkeeping was noticeable in a profile of on-access VM setting. --- src/backend/access/heap/pruneheap.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/src/backend/access/heap/pruneheap.c b/src/backend/access/heap/pruneheap.c index d3c57eedfe3..7f457abf8e1 100644 --- a/src/backend/access/heap/pruneheap.c +++ b/src/backend/access/heap/pruneheap.c @@ -1483,8 +1483,11 @@ heap_prune_record_dead(PruneState *prstate, OffsetNumber offnum, /* * Deliberately delay unsetting all_visible until later during pruning. - * Removable dead tuples shouldn't preclude freezing the page. + * Removable dead tuples shouldn't preclude freezing the page. If we won't + * attempt freezing, just unset all-visible now, though. */ + if (!prstate->attempt_freeze) + prstate->all_visible = prstate->all_frozen = false; /* Record the dead offset for vacuum */ prstate->deadoffsets[prstate->lpdead_items++] = offnum; @@ -1739,8 +1742,11 @@ heap_prune_record_unchanged_lp_dead(Page page, PruneState *prstate, OffsetNumber * Similarly, don't unset all_visible until later, at the end of * heap_page_prune_and_freeze(). This will allow us to attempt to freeze * the page after pruning. As long as we unset it before updating the - * visibility map, this will be correct. + * visibility map, this will be correct. If we won't attempt freezing, + * though, just unset all-visible now. */ + if (!prstate->attempt_freeze) + prstate->all_visible = prstate->all_frozen = false; /* Record the dead offset for vacuum */ prstate->deadoffsets[prstate->lpdead_items++] = offnum; -- 2.43.0