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Marginal hack to merge adjacent ReleaseBuffer/ReadBuffer calls into 

ReleaseAndReadBuffer during GIST index searches.  We already did this
in btree and rtree, might as well do it here too.
This commit is contained in:
Tom Lane 2005-02-05 19:38:58 +00:00
parent 11635c3f6f
commit 12179c99b1
1 changed files with 24 additions and 18 deletions
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42
src/backend/access/gist/gistget.c
View File

@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/gist/gistget.c,v 1.43 2004/12/31 21:59:10 pgsql Exp $
* $PostgreSQL: pgsql/src/backend/access/gist/gistget.c,v 1.44 2005/02/05 19:38:58 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -60,10 +60,11 @@ gistfirst(IndexScanDesc s, ScanDirection dir)
BlockNumber blk;
IndexTuple it;
so = (GISTScanOpaque) s->opaque;
b = ReadBuffer(s->indexRelation, GISTP_ROOT);
p = BufferGetPage(b);
po = (GISTPageOpaque) PageGetSpecialPointer(p);
so = (GISTScanOpaque) s->opaque;
for (;;)
{
@ -75,12 +76,14 @@ gistfirst(IndexScanDesc s, ScanDirection dir)
while (n < FirstOffsetNumber || n > maxoff)
{
ReleaseBuffer(b);
if (so->s_stack == NULL)
return false;
stk = so->s_stack;
b = ReadBuffer(s->indexRelation, stk->gs_blk);
if (stk == NULL)
{
ReleaseBuffer(b);
return false;
}
b = ReleaseAndReadBuffer(b, s->indexRelation, stk->gs_blk);
p = BufferGetPage(b);
po = (GISTPageOpaque) PageGetSpecialPointer(p);
maxoff = PageGetMaxOffsetNumber(p);
@ -89,6 +92,7 @@ gistfirst(IndexScanDesc s, ScanDirection dir)
n = OffsetNumberPrev(stk->gs_child);
else
n = OffsetNumberNext(stk->gs_child);
so->s_stack = stk->gs_parent;
pfree(stk);
@ -116,8 +120,7 @@ gistfirst(IndexScanDesc s, ScanDirection dir)
it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
blk = ItemPointerGetBlockNumber(&(it->t_tid));
ReleaseBuffer(b);
b = ReadBuffer(s->indexRelation, blk);
b = ReleaseAndReadBuffer(b, s->indexRelation, blk);
p = BufferGetPage(b);
po = (GISTPageOpaque) PageGetSpecialPointer(p);
}
@ -137,6 +140,8 @@ gistnext(IndexScanDesc s, ScanDirection dir)
BlockNumber blk;
IndexTuple it;
so = (GISTScanOpaque) s->opaque;
blk = ItemPointerGetBlockNumber(&(s->currentItemData));
n = ItemPointerGetOffsetNumber(&(s->currentItemData));
@ -148,7 +153,6 @@ gistnext(IndexScanDesc s, ScanDirection dir)
b = ReadBuffer(s->indexRelation, blk);
p = BufferGetPage(b);
po = (GISTPageOpaque) PageGetSpecialPointer(p);
so = (GISTScanOpaque) s->opaque;
for (;;)
{
@ -157,20 +161,23 @@ gistnext(IndexScanDesc s, ScanDirection dir)
while (n < FirstOffsetNumber || n > maxoff)
{
ReleaseBuffer(b);
if (so->s_stack == NULL)
return false;
stk = so->s_stack;
b = ReadBuffer(s->indexRelation, stk->gs_blk);
if (stk == NULL)
{
ReleaseBuffer(b);
return false;
}
b = ReleaseAndReadBuffer(b, s->indexRelation, stk->gs_blk);
p = BufferGetPage(b);
maxoff = PageGetMaxOffsetNumber(p);
po = (GISTPageOpaque) PageGetSpecialPointer(p);
maxoff = PageGetMaxOffsetNumber(p);
if (ScanDirectionIsBackward(dir))
n = OffsetNumberPrev(stk->gs_child);
else
n = OffsetNumberNext(stk->gs_child);
so->s_stack = stk->gs_parent;
pfree(stk);
@ -198,8 +205,7 @@ gistnext(IndexScanDesc s, ScanDirection dir)
it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
blk = ItemPointerGetBlockNumber(&(it->t_tid));
ReleaseBuffer(b);
b = ReadBuffer(s->indexRelation, blk);
b = ReleaseAndReadBuffer(b, s->indexRelation, blk);
p = BufferGetPage(b);
po = (GISTPageOpaque) PageGetSpecialPointer(p);