Clarify some comments in vacuumlazy.c

Author: Justin Pryzby
Discussion: https://postgr.es/m/20200113004542.GA26045@telsasoft.com
This commit is contained in:
Michael Paquier 2020-01-23 15:56:56 +09:00
parent 611ce856f5
commit f942dfb952
1 changed files with 5 additions and 5 deletions

View File

@ -1507,8 +1507,8 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats,
/*
* It should never be the case that the visibility map page is set
* while the page-level bit is clear, but the reverse is allowed
* (if checksums are not enabled). Regardless, set the both bits
* so that we get back in sync.
* (if checksums are not enabled). Regardless, set both bits so
* that we get back in sync.
*
* NB: If the heap page is all-visible but the VM bit is not set,
* we don't need to dirty the heap page. However, if checksums
@ -1563,9 +1563,9 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats,
}
/*
* If the all-visible page is turned out to be all-frozen but not
* marked, we should so mark it. Note that all_frozen is only valid
* if all_visible is true, so we must check both.
* If the all-visible page is all-frozen but not marked as such yet,
* mark it as all-frozen. Note that all_frozen is only valid if
* all_visible is true, so we must check both.
*/
else if (all_visible_according_to_vm && all_visible && all_frozen &&
!VM_ALL_FROZEN(onerel, blkno, &vmbuffer))