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Change the format of the VM fork to add a second bit per page.

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The new bit indicates whether every tuple on the page is already frozen.
It is cleared only when the all-visible bit is cleared, and it can be
set only when we vacuum a page and find that every tuple on that page is
both visible to every transaction and in no need of any future
vacuuming.

A future commit will use this new bit to optimize away full-table scans
that would otherwise be triggered by XID wraparound considerations.  A
page which is merely all-visible must still be scanned in that case, but
a page which is all-frozen need not be.  This commit does not attempt
that optimization, although that optimization is the goal here.  It
seems better to get the basic infrastructure in place first.

Per discussion, it's very desirable for pg_upgrade to automatically
migrate existing VM forks from the old format to the new format.  That,
too, will be handled in a follow-on patch.

Masahiko Sawada, reviewed by Kyotaro Horiguchi, Fujii Masao, Amit
Kapila, Simon Riggs, Andres Freund, and others, and substantially
revised by me.
This commit is contained in:
Robert Haas
2016-03-01 21:49:41 -05:00
parent 68c521eb92
commit a892234f83
14 changed files with 308 additions and 125 deletions
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5
src/include/access/heapam_xlog.h
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@ -320,9 +320,10 @@ typedef struct xl_heap_freeze_page
typedef struct xl_heap_visible
{
TransactionId cutoff_xid;
uint8 flags;
} xl_heap_visible;
#define SizeOfHeapVisible (offsetof(xl_heap_visible, cutoff_xid) + sizeof(TransactionId))
#define SizeOfHeapVisible (offsetof(xl_heap_visible, flags) + sizeof(uint8))
typedef struct xl_heap_new_cid
{
@ -389,6 +390,6 @@ extern bool heap_prepare_freeze_tuple(HeapTupleHeader tuple,
extern void heap_execute_freeze_tuple(HeapTupleHeader tuple,
xl_heap_freeze_tuple *xlrec_tp);
extern XLogRecPtr log_heap_visible(RelFileNode rnode, Buffer heap_buffer,
Buffer vm_buffer, TransactionId cutoff_xid);
Buffer vm_buffer, TransactionId cutoff_xid, uint8 flags);
#endif /* HEAPAM_XLOG_H */