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Document WAL rules related to PD_ALL_VISIBLE in README.

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Also improve comments.

Discussion: https://postgr.es/m/a50005c1c537f89bb359057fd70e66bb83bce969.camel@j-davis.com
Reviewed-by: Peter Geoghegan
This commit is contained in:
Jeff Davis
2022-11-12 08:37:50 -08:00
parent d6a3dbe14f
commit 97c61f70d1
3 changed files with 32 additions and 8 deletions
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6
src/backend/access/heap/heapam.c
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@ -8193,8 +8193,10 @@ log_heap_freeze(Relation reln, Buffer buffer, TransactionId cutoff_xid,
* corresponding visibility map block. Both should have already been modified
* and dirtied.
*
* If checksums are enabled, we also generate a full-page image of
* heap_buffer, if necessary.
* If checksums or wal_log_hints are enabled, we may also generate a full-page
* image of heap_buffer. Otherwise, we optimize away the FPI (by specifying
* REGBUF_NO_IMAGE for the heap buffer), in which case the caller should *not*
* update the heap page's LSN.
*/
XLogRecPtr
log_heap_visible(RelFileLocator rlocator, Buffer heap_buffer, Buffer vm_buffer,