database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-08-21 10:42:50 +03:00
Code Activity

Revert no-op changes to BufferGetPage()

Browse Source 
The reverted changes were intended to force a choice of whether any
newly-added BufferGetPage() calls needed to be accompanied by a
test of the snapshot age, to support the "snapshot too old"
feature.  Such an accompanying test is needed in about 7% of the
cases, where the page is being used as part of a scan rather than
positioning for other purposes (such as DML or vacuuming).  The
additional effort required for back-patching, and the doubt whether
the intended benefit would really be there, have indicated it is
best just to rely on developers to do the right thing based on
comments and existing usage, as we do with many other conventions.

This change should have little or no effect on generated executable
code.

Motivated by the back-patching pain of Tom Lane and Robert Haas
This commit is contained in:
Kevin Grittner
2016-04-20 08:31:19 -05:00
parent 4db0d2d2fe
commit a343e223a5
65 changed files with 550 additions and 736 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
src/backend/access/gin/ginentrypage.c
View File

@@ -274,8 +274,7 @@ entryLocateEntry(GinBtree btree, GinBtreeStack *stack)
maxoff;
IndexTuple itup = NULL;
int result;
Page page = BufferGetPage(stack->buffer, NULL, NULL,
BGP_NO_SNAPSHOT_TEST);
Page page = BufferGetPage(stack->buffer);
Assert(!GinPageIsLeaf(page));
Assert(!GinPageIsData(page));
@@ -346,8 +345,7 @@ entryLocateEntry(GinBtree btree, GinBtreeStack *stack)
static bool
entryLocateLeafEntry(GinBtree btree, GinBtreeStack *stack)
{
Page page = BufferGetPage(stack->buffer, NULL, NULL,
BGP_NO_SNAPSHOT_TEST);
Page page = BufferGetPage(stack->buffer);
OffsetNumber low,
high;
@@ -463,7 +461,7 @@ entryIsEnoughSpace(GinBtree btree, Buffer buf, OffsetNumber off,
{
Size releasedsz = 0;
Size addedsz;
Page page = BufferGetPage(buf, NULL, NULL, BGP_NO_SNAPSHOT_TEST);
Page page = BufferGetPage(buf);
Assert(insertData->entry);
Assert(!GinPageIsData(page));
@@ -527,7 +525,7 @@ entryPlaceToPage(GinBtree btree, Buffer buf, GinBtreeStack *stack,
Page *newlpage, Page *newrpage)
{
GinBtreeEntryInsertData *insertData = insertPayload;
Page page = BufferGetPage(buf, NULL, NULL, BGP_NO_SNAPSHOT_TEST);
Page page = BufferGetPage(buf);
OffsetNumber off = stack->off;
OffsetNumber placed;
@@ -594,10 +592,8 @@ entrySplitPage(GinBtree btree, Buffer origbuf,
char *ptr;
IndexTuple itup;
Page page;
Page lpage = PageGetTempPageCopy(BufferGetPage(origbuf, NULL, NULL,
BGP_NO_SNAPSHOT_TEST));
Page rpage = PageGetTempPageCopy(BufferGetPage(origbuf, NULL, NULL,
BGP_NO_SNAPSHOT_TEST));
Page lpage = PageGetTempPageCopy(BufferGetPage(origbuf));
Page rpage = PageGetTempPageCopy(BufferGetPage(origbuf));
Size pageSize = PageGetPageSize(lpage);
char tupstore[2 * BLCKSZ];
@@ -678,7 +674,7 @@ static void *
entryPrepareDownlink(GinBtree btree, Buffer lbuf)
{
GinBtreeEntryInsertData *insertData;
Page lpage = BufferGetPage(lbuf, NULL, NULL, BGP_NO_SNAPSHOT_TEST);
Page lpage = BufferGetPage(lbuf);
BlockNumber lblkno = BufferGetBlockNumber(lbuf);
IndexTuple itup;