database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-07 19:06:32 +03:00
Code Activity

Predicate locking in GIN index

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

12
src/backend/access/gin/ginvacuum.c
View File

@@ -22,6 +22,7 @@
#include "postmaster/autovacuum.h"
#include "storage/indexfsm.h"
#include "storage/lmgr.h"
#include "storage/predicate.h"
#include "utils/memutils.h"
struct GinVacuumState
@@ -153,11 +154,18 @@ ginDeletePage(GinVacuumState *gvs, BlockNumber deleteBlkno, BlockNumber leftBlkn
LockBuffer(lBuffer, GIN_EXCLUSIVE);
page = BufferGetPage(dBuffer);
rightlink = GinPageGetOpaque(page)->rightlink;
/*
* Any insert which would have gone on the leaf block will now go to its
* right sibling.
*/
PredicateLockPageCombine(gvs->index, deleteBlkno, rightlink);
START_CRIT_SECTION();
/* Unlink the page by changing left sibling's rightlink */
page = BufferGetPage(dBuffer);
rightlink = GinPageGetOpaque(page)->rightlink;
page = BufferGetPage(lBuffer);
GinPageGetOpaque(page)->rightlink = rightlink;