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Rename LVRelState->frozen_pages

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Rename frozen_pages to new_frozen_tuple_pages in LVRelState, the struct
used for tracking state during vacuuming of a heap relation.
frozen_pages sounds like it tracks pages set all-frozen. That is a
misnomer. It only includes pages with at least one newly frozen tuple.
It also includes pages that are not all-frozen.

Author: Melanie Plageman
Reviewed-by: Andres Freund, Masahiko Sawada, Nitin Jadhav, Bilal Yavuz

Discussion: https://postgr.es/m/ctdjzroezaxmiyah3gwbwm67defsrwj2b5fpfs4ku6msfpxeia%40mwjyqlhwr2wu
This commit is contained in:
Melanie Plageman 2024-12-17 14:13:00 -05:00
parent 21fb39cb07
commit f020baa066
1 changed files with 10 additions and 8 deletions
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18
src/backend/access/heap/vacuumlazy.c
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@ -188,7 +188,7 @@ typedef struct LVRelState
BlockNumber rel_pages; /* total number of pages */
BlockNumber scanned_pages; /* # pages examined (not skipped via VM) */
BlockNumber removed_pages; /* # pages removed by relation truncation */
BlockNumber frozen_pages; /* # pages with newly frozen tuples */
BlockNumber new_frozen_tuple_pages; /* # pages with newly frozen tuples */
BlockNumber lpdead_item_pages; /* # pages with LP_DEAD items */
BlockNumber missed_dead_pages; /* # pages with missed dead tuples */
BlockNumber nonempty_pages; /* actually, last nonempty page + 1 */
@ -407,7 +407,7 @@ heap_vacuum_rel(Relation rel, VacuumParams *params,
/* Initialize page counters explicitly (be tidy) */
vacrel->scanned_pages = 0;
vacrel->removed_pages = 0;
vacrel->frozen_pages = 0;
vacrel->new_frozen_tuple_pages = 0;
vacrel->lpdead_item_pages = 0;
vacrel->missed_dead_pages = 0;
vacrel->nonempty_pages = 0;
@ -696,9 +696,10 @@ heap_vacuum_rel(Relation rel, VacuumParams *params,
vacrel->NewRelminMxid, diff);
}
appendStringInfo(&buf, _("frozen: %u pages from table (%.2f%% of total) had %lld tuples frozen\n"),
vacrel->frozen_pages,
vacrel->new_frozen_tuple_pages,
orig_rel_pages == 0 ? 100.0 :
100.0 * vacrel->frozen_pages / orig_rel_pages,
100.0 * vacrel->new_frozen_tuple_pages /
orig_rel_pages,
(long long) vacrel->tuples_frozen);
if (vacrel->do_index_vacuuming)
{
@ -1453,11 +1454,12 @@ lazy_scan_prune(LVRelState *vacrel,
if (presult.nfrozen > 0)
{
/*
* We don't increment the frozen_pages instrumentation counter when
* nfrozen == 0, since it only counts pages with newly frozen tuples
* (don't confuse that with pages newly set all-frozen in VM).
* We don't increment the new_frozen_tuple_pages instrumentation
* counter when nfrozen == 0, since it only counts pages with newly
* frozen tuples (don't confuse that with pages newly set all-frozen
* in VM).
*/
vacrel->frozen_pages++;
vacrel->new_frozen_tuple_pages++;
}
/*