mirror of
https://github.com/postgres/postgres.git
synced 2025-07-17 06:41:09 +03:00
Restructure local-buffer handling per recent pghackers discussion.
The local buffer manager is no longer used for newly-created relations (unless they are TEMP); a new non-TEMP relation goes through the shared bufmgr and thus will participate normally in checkpoints. But TEMP relations use the local buffer manager throughout their lifespan. Also, operations in TEMP relations are not logged in WAL, thus improving performance. Since it's no longer necessary to fsync relations as they move out of the local buffers into shared buffers, quite a lot of smgr.c/md.c/fd.c code is no longer needed and has been removed: there's no concept of a dirty relation anymore in md.c/fd.c, and we never fsync anything but WAL. Still TODO: improve local buffer management algorithms so that it would be reasonable to increase NLocBuffer.
This commit is contained in:
Tom Lane
@ -8,7 +8,7 @@
|
||||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $Header: /cvsroot/pgsql/src/backend/commands/sequence.c,v 1.83 2002/07/16 22:12:19 tgl Exp $
|
||||
* $Header: /cvsroot/pgsql/src/backend/commands/sequence.c,v 1.84 2002/08/06 02:36:34 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -237,6 +237,7 @@ DefineSequence(CreateSeqStmt *seq)
|
||||
* means two log records instead of one :-(
|
||||
*/
|
||||
LockBuffer(buf, BUFFER_LOCK_EXCLUSIVE);
|
||||
|
||||
START_CRIT_SECTION();
|
||||
|
||||
{
|
||||
@ -260,6 +261,8 @@ DefineSequence(CreateSeqStmt *seq)
|
||||
tuple->t_data->t_infomask |= HEAP_XMIN_COMMITTED;
|
||||
}
|
||||
|
||||
/* XLOG stuff */
|
||||
if (!rel->rd_istemp)
|
||||
{
|
||||
xl_seq_rec xlrec;
|
||||
XLogRecPtr recptr;
|
||||
@ -287,6 +290,7 @@ DefineSequence(CreateSeqStmt *seq)
|
||||
PageSetLSN(page, recptr);
|
||||
PageSetSUI(page, ThisStartUpID);
|
||||
}
|
||||
|
||||
END_CRIT_SECTION();
|
||||
|
||||
LockBuffer(buf, BUFFER_LOCK_UNLOCK);
|
||||
@ -437,7 +441,9 @@ nextval(PG_FUNCTION_ARGS)
|
||||
elm->cached = last; /* last fetched number */
|
||||
|
||||
START_CRIT_SECTION();
|
||||
if (logit)
|
||||
|
||||
/* XLOG stuff */
|
||||
if (logit && !seqrel->rd_istemp)
|
||||
{
|
||||
xl_seq_rec xlrec;
|
||||
XLogRecPtr recptr;
|
||||
@ -449,9 +455,11 @@ nextval(PG_FUNCTION_ARGS)
|
||||
rdata[0].len = sizeof(xl_seq_rec);
|
||||
rdata[0].next = &(rdata[1]);
|
||||
|
||||
/* set values that will be saved in xlog */
|
||||
seq->last_value = next;
|
||||
seq->is_called = true;
|
||||
seq->log_cnt = 0;
|
||||
|
||||
rdata[1].buffer = InvalidBuffer;
|
||||
rdata[1].data = (char *) page + ((PageHeader) page)->pd_upper;
|
||||
rdata[1].len = ((PageHeader) page)->pd_special -
|
||||
@ -468,6 +476,7 @@ nextval(PG_FUNCTION_ARGS)
|
||||
seq->last_value = last; /* last fetched number */
|
||||
seq->is_called = true;
|
||||
seq->log_cnt = log; /* how much is logged */
|
||||
|
||||
END_CRIT_SECTION();
|
||||
|
||||
LockBuffer(buf, BUFFER_LOCK_UNLOCK);
|
||||
@ -550,6 +559,9 @@ do_setval(RangeVar *sequence, int64 next, bool iscalled)
|
||||
* values) */
|
||||
|
||||
START_CRIT_SECTION();
|
||||
|
||||
/* XLOG stuff */
|
||||
if (!seqrel->rd_istemp)
|
||||
{
|
||||
xl_seq_rec xlrec;
|
||||
XLogRecPtr recptr;
|
||||
@ -562,9 +574,11 @@ do_setval(RangeVar *sequence, int64 next, bool iscalled)
|
||||
rdata[0].len = sizeof(xl_seq_rec);
|
||||
rdata[0].next = &(rdata[1]);
|
||||
|
||||
/* set values that will be saved in xlog */
|
||||
seq->last_value = next;
|
||||
seq->is_called = true;
|
||||
seq->log_cnt = 0;
|
||||
|
||||
rdata[1].buffer = InvalidBuffer;
|
||||
rdata[1].data = (char *) page + ((PageHeader) page)->pd_upper;
|
||||
rdata[1].len = ((PageHeader) page)->pd_special -
|
||||
@ -576,10 +590,12 @@ do_setval(RangeVar *sequence, int64 next, bool iscalled)
|
||||
PageSetLSN(page, recptr);
|
||||
PageSetSUI(page, ThisStartUpID);
|
||||
}
|
||||
|
||||
/* save info in sequence relation */
|
||||
seq->last_value = next; /* last fetched number */
|
||||
seq->is_called = iscalled;
|
||||
seq->log_cnt = (iscalled) ? 0 : 1;
|
||||
|
||||
END_CRIT_SECTION();
|
||||
|
||||
LockBuffer(buf, BUFFER_LOCK_UNLOCK);
|
||||
|
||||
@ -13,7 +13,7 @@
|
||||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.232 2002/07/20 05:16:57 momjian Exp $
|
||||
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.233 2002/08/06 02:36:34 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -1899,6 +1899,8 @@ repair_frag(VRelStats *vacrelstats, Relation onerel,
|
||||
newtup.t_data = (HeapTupleHeader) PageGetItem(ToPage, newitemid);
|
||||
ItemPointerSet(&(newtup.t_self), destvacpage->blkno, newoff);
|
||||
|
||||
/* XLOG stuff */
|
||||
if (!onerel->rd_istemp)
|
||||
{
|
||||
XLogRecPtr recptr =
|
||||
log_heap_move(onerel, Cbuf, tuple.t_self,
|
||||
@ -1912,6 +1914,12 @@ repair_frag(VRelStats *vacrelstats, Relation onerel,
|
||||
PageSetLSN(ToPage, recptr);
|
||||
PageSetSUI(ToPage, ThisStartUpID);
|
||||
}
|
||||
else
|
||||
{
|
||||
/* No XLOG record, but still need to flag that XID exists on disk */
|
||||
MyXactMadeTempRelUpdate = true;
|
||||
}
|
||||
|
||||
END_CRIT_SECTION();
|
||||
|
||||
if (destvacpage->blkno > last_move_dest_block)
|
||||
@ -2042,6 +2050,8 @@ repair_frag(VRelStats *vacrelstats, Relation onerel,
|
||||
tuple.t_data->t_infomask |= HEAP_MOVED_OFF;
|
||||
HeapTupleHeaderSetXvac(tuple.t_data, myXID);
|
||||
|
||||
/* XLOG stuff */
|
||||
if (!onerel->rd_istemp)
|
||||
{
|
||||
XLogRecPtr recptr =
|
||||
log_heap_move(onerel, buf, tuple.t_self,
|
||||
@ -2052,6 +2062,12 @@ repair_frag(VRelStats *vacrelstats, Relation onerel,
|
||||
PageSetLSN(ToPage, recptr);
|
||||
PageSetSUI(ToPage, ThisStartUpID);
|
||||
}
|
||||
else
|
||||
{
|
||||
/* No XLOG record, but still need to flag that XID exists on disk */
|
||||
MyXactMadeTempRelUpdate = true;
|
||||
}
|
||||
|
||||
END_CRIT_SECTION();
|
||||
|
||||
cur_page->offsets_used++;
|
||||
@ -2321,8 +2337,13 @@ repair_frag(VRelStats *vacrelstats, Relation onerel,
|
||||
|
||||
}
|
||||
Assert(vacpage->offsets_free == num_tuples);
|
||||
|
||||
START_CRIT_SECTION();
|
||||
|
||||
uncnt = PageRepairFragmentation(page, unused);
|
||||
|
||||
/* XLOG stuff */
|
||||
if (!onerel->rd_istemp)
|
||||
{
|
||||
XLogRecPtr recptr;
|
||||
|
||||
@ -2331,7 +2352,14 @@ repair_frag(VRelStats *vacrelstats, Relation onerel,
|
||||
PageSetLSN(page, recptr);
|
||||
PageSetSUI(page, ThisStartUpID);
|
||||
}
|
||||
else
|
||||
{
|
||||
/* No XLOG record, but still need to flag that XID exists on disk */
|
||||
MyXactMadeTempRelUpdate = true;
|
||||
}
|
||||
|
||||
END_CRIT_SECTION();
|
||||
|
||||
LockBuffer(buf, BUFFER_LOCK_UNLOCK);
|
||||
WriteBuffer(buf);
|
||||
}
|
||||
@ -2450,12 +2478,17 @@ vacuum_page(Relation onerel, Buffer buffer, VacPage vacpage)
|
||||
Assert(vacpage->offsets_used == 0);
|
||||
|
||||
START_CRIT_SECTION();
|
||||
|
||||
for (i = 0; i < vacpage->offsets_free; i++)
|
||||
{
|
||||
itemid = PageGetItemId(page, vacpage->offsets[i]);
|
||||
itemid->lp_flags &= ~LP_USED;
|
||||
}
|
||||
|
||||
uncnt = PageRepairFragmentation(page, unused);
|
||||
|
||||
/* XLOG stuff */
|
||||
if (!onerel->rd_istemp)
|
||||
{
|
||||
XLogRecPtr recptr;
|
||||
|
||||
@ -2464,6 +2497,12 @@ vacuum_page(Relation onerel, Buffer buffer, VacPage vacpage)
|
||||
PageSetLSN(page, recptr);
|
||||
PageSetSUI(page, ThisStartUpID);
|
||||
}
|
||||
else
|
||||
{
|
||||
/* No XLOG record, but still need to flag that XID exists on disk */
|
||||
MyXactMadeTempRelUpdate = true;
|
||||
}
|
||||
|
||||
END_CRIT_SECTION();
|
||||
}
|
||||
|
||||
|
||||
@ -31,7 +31,7 @@
|
||||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $Header: /cvsroot/pgsql/src/backend/commands/vacuumlazy.c,v 1.17 2002/07/20 05:16:57 momjian Exp $
|
||||
* $Header: /cvsroot/pgsql/src/backend/commands/vacuumlazy.c,v 1.18 2002/08/06 02:36:34 tgl Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -523,6 +523,8 @@ lazy_vacuum_page(Relation onerel, BlockNumber blkno, Buffer buffer,
|
||||
|
||||
uncnt = PageRepairFragmentation(page, unused);
|
||||
|
||||
/* XLOG stuff */
|
||||
if (!onerel->rd_istemp)
|
||||
{
|
||||
XLogRecPtr recptr;
|
||||
|
||||
@ -531,6 +533,12 @@ lazy_vacuum_page(Relation onerel, BlockNumber blkno, Buffer buffer,
|
||||
PageSetLSN(page, recptr);
|
||||
PageSetSUI(page, ThisStartUpID);
|
||||
}
|
||||
else
|
||||
{
|
||||
/* No XLOG record, but still need to flag that XID exists on disk */
|
||||
MyXactMadeTempRelUpdate = true;
|
||||
}
|
||||
|
||||
END_CRIT_SECTION();
|
||||
|
||||
return tupindex;
|
||||
|
||||
Reference in New Issue
Block a user