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Predicate locking in GIN index

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Predicate locks are used on per page basis only if fastupdate = off, in
opposite case predicate lock on pending list will effectively lock whole index,
to reduce locking overhead, just lock a relation. Entry and posting trees are
essentially B-tree, so locks are acquired on leaf pages only.

Author: Shubham Barai with some editorization by me and Dmitry Ivanov
Review by: Alexander Korotkov, Dmitry Ivanov, Fedor Sigaev
Discussion: https://www.postgresql.org/message-id/flat/CALxAEPt5sWW+EwTaKUGFL5_XFcZ0MuGBcyJ70oqbWqr42YKR8Q@mail.gmail.com
This commit is contained in:
Teodor Sigaev
2018-03-30 14:23:17 +03:00
parent 019fa576ca
commit 43d1ed60fd
11 changed files with 1054 additions and 18 deletions
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22
src/backend/access/gin/ginbtree.c
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@ -17,6 +17,7 @@
#include "access/gin_private.h"
#include "access/ginxlog.h"
#include "access/xloginsert.h"
#include "storage/predicate.h"
#include "miscadmin.h"
#include "utils/memutils.h"
#include "utils/rel.h"
@ -515,6 +516,19 @@ ginPlaceToPage(GinBtree btree, GinBtreeStack *stack,
btree->fillRoot(btree, newrootpg,
BufferGetBlockNumber(lbuffer), newlpage,
BufferGetBlockNumber(rbuffer), newrpage);
if (GinPageIsLeaf(BufferGetPage(stack->buffer)))
{
PredicateLockPageSplit(btree->index,
BufferGetBlockNumber(stack->buffer),
BufferGetBlockNumber(lbuffer));
PredicateLockPageSplit(btree->index,
BufferGetBlockNumber(stack->buffer),
BufferGetBlockNumber(rbuffer));
}
}
else
{
@ -524,6 +538,14 @@ ginPlaceToPage(GinBtree btree, GinBtreeStack *stack,
GinPageGetOpaque(newrpage)->rightlink = savedRightLink;
GinPageGetOpaque(newlpage)->flags |= GIN_INCOMPLETE_SPLIT;
GinPageGetOpaque(newlpage)->rightlink = BufferGetBlockNumber(rbuffer);
if (GinPageIsLeaf(BufferGetPage(stack->buffer)))
{
PredicateLockPageSplit(btree->index,
BufferGetBlockNumber(stack->buffer),
BufferGetBlockNumber(rbuffer));
}
}
/*