On Thu, Nov 28, 2013 at 05:38:05PM -0500, Bruce Momjian wrote:
> > I wonder if we ought to mark each page as all-visible in
> > raw_heap_insert() when we first initialize it, and then clear the flag
> > when we come across a tuple that isn't all-visible. We could try to
> > set hint bits on the tuple before placing it on the page, too, though
> > I'm not sure of the details.
>
> I went with the per-page approach because I wanted to re-use the vacuum
> lazy function. Is there some other code that does this already? I am
> trying to avoid yet-another set of routines that would need to be
> maintained or could be buggy. This hit bit setting is tricky.
>
> And thanks much for the review!
So, should I put this in the next commit fest? I still have an unknown
about the buffer number to use here:
! /* XXX use 0 or real offset? */
! ItemPointerSet(&(tuple.t_self), BufferIsValid(buf) ?
! BufferGetBlockNumber(buf) : 0, offnum);
Is everyone else OK with this approach? Updated patch attached.
--
Bruce Momjian <br...@momjian.us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ Everyone has their own god. +
diff --git a/src/backend/access/heap/rewriteheap.c b/src/backend/access/heap/rewriteheap.c
new file mode 100644
index 951894c..44ae5d8
*** a/src/backend/access/heap/rewriteheap.c
--- b/src/backend/access/heap/rewriteheap.c
***************
*** 107,112 ****
--- 107,114 ----
#include "access/rewriteheap.h"
#include "access/transam.h"
#include "access/tuptoaster.h"
+ #include "access/visibilitymap.h"
+ #include "commands/vacuum.h"
#include "storage/bufmgr.h"
#include "storage/smgr.h"
#include "utils/memutils.h"
*************** typedef OldToNewMappingData *OldToNewMap
*** 172,177 ****
--- 174,180 ----
/* prototypes for internal functions */
static void raw_heap_insert(RewriteState state, HeapTuple tup);
+ static void update_page_vm(Relation relation, Page page, BlockNumber blkno);
/*
*************** end_heap_rewrite(RewriteState state)
*** 280,285 ****
--- 283,289 ----
state->rs_buffer);
RelationOpenSmgr(state->rs_new_rel);
+ update_page_vm(state->rs_new_rel, state->rs_buffer, state->rs_blockno);
PageSetChecksumInplace(state->rs_buffer, state->rs_blockno);
smgrextend(state->rs_new_rel->rd_smgr, MAIN_FORKNUM, state->rs_blockno,
*************** raw_heap_insert(RewriteState state, Heap
*** 632,637 ****
--- 636,642 ----
*/
RelationOpenSmgr(state->rs_new_rel);
+ update_page_vm(state->rs_new_rel, page, state->rs_blockno);
PageSetChecksumInplace(page, state->rs_blockno);
smgrextend(state->rs_new_rel->rd_smgr, MAIN_FORKNUM,
*************** raw_heap_insert(RewriteState state, Heap
*** 677,679 ****
--- 682,704 ----
if (heaptup != tup)
heap_freetuple(heaptup);
}
+
+ static void
+ update_page_vm(Relation relation, Page page, BlockNumber blkno)
+ {
+ Buffer vmbuffer = InvalidBuffer;
+ TransactionId visibility_cutoff_xid;
+
+ visibilitymap_pin(relation, blkno, &vmbuffer);
+ Assert(BufferIsValid(vmbuffer));
+
+ if (!visibilitymap_test(relation, blkno, &vmbuffer) &&
+ heap_page_is_all_visible(relation, InvalidBuffer, page,
+ &visibility_cutoff_xid))
+ {
+ PageSetAllVisible(page);
+ visibilitymap_set(relation, blkno, InvalidBlockNumber,
+ InvalidXLogRecPtr, vmbuffer, visibility_cutoff_xid);
+ }
+ ReleaseBuffer(vmbuffer);
+ }
diff --git a/src/backend/access/heap/visibilitymap.c b/src/backend/access/heap/visibilitymap.c
new file mode 100644
index 7f40d89..a42511b
*** a/src/backend/access/heap/visibilitymap.c
--- b/src/backend/access/heap/visibilitymap.c
*************** visibilitymap_set(Relation rel, BlockNum
*** 278,284 ****
map[mapByte] |= (1 << mapBit);
MarkBufferDirty(vmBuf);
! if (RelationNeedsWAL(rel))
{
if (XLogRecPtrIsInvalid(recptr))
{
--- 278,284 ----
map[mapByte] |= (1 << mapBit);
MarkBufferDirty(vmBuf);
! if (RelationNeedsWAL(rel) && BufferIsValid(heapBuf))
{
if (XLogRecPtrIsInvalid(recptr))
{
diff --git a/src/backend/commands/vacuumlazy.c b/src/backend/commands/vacuumlazy.c
new file mode 100644
index fe2d9e7..4f6578f
*** a/src/backend/commands/vacuumlazy.c
--- b/src/backend/commands/vacuumlazy.c
*************** static void lazy_record_dead_tuple(LVRel
*** 151,158 ****
ItemPointer itemptr);
static bool lazy_tid_reaped(ItemPointer itemptr, void *state);
static int vac_cmp_itemptr(const void *left, const void *right);
- static bool heap_page_is_all_visible(Relation rel, Buffer buf,
- TransactionId *visibility_cutoff_xid);
/*
--- 151,156 ----
*************** lazy_vacuum_page(Relation onerel, BlockN
*** 1197,1203 ****
* check if the page has become all-visible.
*/
if (!visibilitymap_test(onerel, blkno, vmbuffer) &&
! heap_page_is_all_visible(onerel, buffer, &visibility_cutoff_xid))
{
Assert(BufferIsValid(*vmbuffer));
PageSetAllVisible(page);
--- 1195,1201 ----
* check if the page has become all-visible.
*/
if (!visibilitymap_test(onerel, blkno, vmbuffer) &&
! heap_page_is_all_visible(onerel, buffer, NULL, &visibility_cutoff_xid))
{
Assert(BufferIsValid(*vmbuffer));
PageSetAllVisible(page);
*************** vac_cmp_itemptr(const void *left, const
*** 1704,1717 ****
* transactions. Also return the visibility_cutoff_xid which is the highest
* xmin amongst the visible tuples.
*/
! static bool
! heap_page_is_all_visible(Relation rel, Buffer buf, TransactionId *visibility_cutoff_xid)
{
- Page page = BufferGetPage(buf);
OffsetNumber offnum,
maxoff;
bool all_visible = true;
*visibility_cutoff_xid = InvalidTransactionId;
/*
--- 1702,1718 ----
* transactions. Also return the visibility_cutoff_xid which is the highest
* xmin amongst the visible tuples.
*/
! bool
! heap_page_is_all_visible(Relation rel, Buffer buf, Page page,
! TransactionId *visibility_cutoff_xid)
{
OffsetNumber offnum,
maxoff;
bool all_visible = true;
+ if (BufferIsValid(buf))
+ page = BufferGetPage(buf);
+
*visibility_cutoff_xid = InvalidTransactionId;
/*
*************** heap_page_is_all_visible(Relation rel, B
*** 1732,1738 ****
if (!ItemIdIsUsed(itemid) || ItemIdIsRedirected(itemid))
continue;
! ItemPointerSet(&(tuple.t_self), BufferGetBlockNumber(buf), offnum);
/*
* Dead line pointers can have index pointers pointing to them. So
--- 1733,1741 ----
if (!ItemIdIsUsed(itemid) || ItemIdIsRedirected(itemid))
continue;
! /* XXX use 0 or real offset? */
! ItemPointerSet(&(tuple.t_self), BufferIsValid(buf) ?
! BufferGetBlockNumber(buf) : 0, offnum);
/*
* Dead line pointers can have index pointers pointing to them. So
diff --git a/src/backend/utils/time/tqual.c b/src/backend/utils/time/tqual.c
new file mode 100644
index 1ebc5ff..c53e2fb
*** a/src/backend/utils/time/tqual.c
--- b/src/backend/utils/time/tqual.c
*************** static inline void
*** 108,113 ****
--- 108,117 ----
SetHintBits(HeapTupleHeader tuple, Buffer buffer,
uint16 infomask, TransactionId xid)
{
+ /* we might not have a buffer if we are doing raw_heap_insert() */
+ if (!BufferIsValid(buffer))
+ return;
+
if (TransactionIdIsValid(xid))
{
/* NB: xid must be known committed here! */
diff --git a/src/include/commands/vacuum.h b/src/include/commands/vacuum.h
new file mode 100644
index 44a3c3b..7e3ff9c
*** a/src/include/commands/vacuum.h
--- b/src/include/commands/vacuum.h
***************
*** 19,24 ****
--- 19,25 ----
#include "catalog/pg_type.h"
#include "nodes/parsenodes.h"
#include "storage/buf.h"
+ #include "storage/bufpage.h"
#include "storage/lock.h"
#include "utils/relcache.h"
*************** extern void vacuum_delay_point(void);
*** 168,173 ****
--- 169,176 ----
/* in commands/vacuumlazy.c */
extern void lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt,
BufferAccessStrategy bstrategy);
+ extern bool heap_page_is_all_visible(Relation rel, Buffer buf, Page page,
+ TransactionId *visibility_cutoff_xid);
/* in commands/analyze.c */
extern void analyze_rel(Oid relid, VacuumStmt *vacstmt,
--
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