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Reduce size of critial section during vacuum full, critical
sections now isn't nested. All user-defined functions now is called outside critsections. Small improvements in WAL protocol. TODO: improve XLOG replay
This commit is contained in:
Teodor Sigaev
@ -8,7 +8,7 @@
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/access/gist/gistvacuum.c,v 1.20 2006/05/10 09:19:54 teodor Exp $
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* $PostgreSQL: pgsql/src/backend/access/gist/gistvacuum.c,v 1.21 2006/05/17 16:34:59 teodor Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -47,23 +47,235 @@ typedef struct
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bool emptypage;
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} ArrayTuple;
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/*
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* Make union of keys on page
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*/
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static IndexTuple
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PageMakeUnionKey(GistVacuum *gv, Buffer buffer) {
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Page page = BufferGetPage( buffer );
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IndexTuple *vec,
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tmp, res;
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int veclen = 0;
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MemoryContext oldCtx = MemoryContextSwitchTo(gv->opCtx);
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vec = gistextractpage(page, &veclen);
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/* we call gistunion() in temprorary context because user-defined functions called in gistunion()
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may do not free all memory */
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tmp = gistunion(gv->index, vec, veclen, &(gv->giststate));
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MemoryContextSwitchTo(oldCtx);
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res = (IndexTuple) palloc(IndexTupleSize(tmp));
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memcpy(res, tmp, IndexTupleSize(tmp));
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ItemPointerSetBlockNumber(&(res->t_tid), BufferGetBlockNumber(buffer));
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GistTupleSetValid(res);
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MemoryContextReset(gv->opCtx);
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return res;
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}
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static void
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gistDeleteSubtree( GistVacuum *gv, BlockNumber blkno ) {
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Buffer buffer;
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Page page;
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buffer = ReadBuffer(gv->index, blkno);
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LockBuffer(buffer, GIST_EXCLUSIVE);
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page = (Page) BufferGetPage(buffer);
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if ( !GistPageIsLeaf(page) ) {
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int i;
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for (i = FirstOffsetNumber; i <= PageGetMaxOffsetNumber(page); i = OffsetNumberNext(i)) {
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ItemId iid = PageGetItemId(page, i);
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IndexTuple idxtuple = (IndexTuple) PageGetItem(page, iid);
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gistDeleteSubtree(gv, ItemPointerGetBlockNumber(&(idxtuple->t_tid)));
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}
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}
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START_CRIT_SECTION();
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MarkBufferDirty(buffer);
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page = (Page) BufferGetPage(buffer);
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GistPageSetDeleted(page);
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gv->result->std.pages_deleted++;
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if (!gv->index->rd_istemp)
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{
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XLogRecData rdata;
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XLogRecPtr recptr;
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gistxlogPageDelete xlrec;
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xlrec.node = gv->index->rd_node;
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xlrec.blkno = blkno;
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rdata.buffer = InvalidBuffer;
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rdata.data = (char *) &xlrec;
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rdata.len = sizeof(gistxlogPageDelete);
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rdata.next = NULL;
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recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_PAGE_DELETE, &rdata);
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PageSetLSN(page, recptr);
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PageSetTLI(page, ThisTimeLineID);
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}
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else
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PageSetLSN(page, XLogRecPtrForTemp);
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END_CRIT_SECTION();
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UnlockReleaseBuffer(buffer);
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}
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static Page
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GistPageGetCopyPage( Page page ) {
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Size pageSize = PageGetPageSize( page );
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Page tmppage;
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tmppage=(Page)palloc( pageSize );
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memcpy( tmppage, page, pageSize );
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return tmppage;
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}
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static ArrayTuple
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vacuumSplitPage(GistVacuum *gv, Page tempPage, Buffer buffer, IndexTuple *addon, int curlenaddon) {
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ArrayTuple res = {NULL, 0, false};
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IndexTuple *vec;
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SplitedPageLayout *dist = NULL,
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*ptr;
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int i, veclen=0;
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BlockNumber blkno = BufferGetBlockNumber(buffer);
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MemoryContext oldCtx = MemoryContextSwitchTo(gv->opCtx);
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vec = gistextractpage(tempPage, &veclen);
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vec = gistjoinvector(vec, &veclen, addon, curlenaddon);
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dist = gistSplit(gv->index, tempPage, vec, veclen, &(gv->giststate));
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MemoryContextSwitchTo(oldCtx);
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if (blkno != GIST_ROOT_BLKNO) {
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/* if non-root split then we should not allocate new buffer */
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dist->buffer = buffer;
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dist->page = tempPage;
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/* during vacuum we never split leaf page */
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GistPageGetOpaque(dist->page)->flags = 0;
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} else
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pfree(tempPage);
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res.itup = (IndexTuple *) palloc(sizeof(IndexTuple) * veclen);
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res.ituplen = 0;
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/* make new pages and fills them */
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for (ptr = dist; ptr; ptr = ptr->next) {
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char *data;
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if ( ptr->buffer == InvalidBuffer ) {
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ptr->buffer = gistNewBuffer( gv->index );
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GISTInitBuffer( ptr->buffer, 0 );
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ptr->page = BufferGetPage(ptr->buffer);
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}
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ptr->block.blkno = BufferGetBlockNumber( ptr->buffer );
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data = (char*)(ptr->list);
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for(i=0;i<ptr->block.num;i++) {
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if ( PageAddItem(ptr->page, (Item)data, IndexTupleSize((IndexTuple)data), i+FirstOffsetNumber, LP_USED) == InvalidOffsetNumber )
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elog(ERROR, "failed to add item to index page in \"%s\"", RelationGetRelationName(gv->index));
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data += IndexTupleSize((IndexTuple)data);
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}
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ItemPointerSetBlockNumber(&(ptr->itup->t_tid), ptr->block.blkno);
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res.itup[ res.ituplen ] = (IndexTuple)palloc(IndexTupleSize(ptr->itup));
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memcpy( res.itup[ res.ituplen ], ptr->itup, IndexTupleSize(ptr->itup) );
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res.ituplen++;
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}
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START_CRIT_SECTION();
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for (ptr = dist; ptr; ptr = ptr->next) {
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MarkBufferDirty(ptr->buffer);
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GistPageGetOpaque(ptr->page)->rightlink = InvalidBlockNumber;
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}
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/* restore splitted non-root page */
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if (blkno != GIST_ROOT_BLKNO) {
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PageRestoreTempPage( dist->page, BufferGetPage( dist->buffer ) );
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dist->page = BufferGetPage( dist->buffer );
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}
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if (!gv->index->rd_istemp)
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{
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XLogRecPtr recptr;
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XLogRecData *rdata;
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ItemPointerData key; /* set key for incomplete
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* insert */
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char *xlinfo;
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ItemPointerSet(&key, blkno, TUPLE_IS_VALID);
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rdata = formSplitRdata(gv->index->rd_node, blkno,
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false, &key, dist);
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xlinfo = rdata->data;
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recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_PAGE_SPLIT, rdata);
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for (ptr = dist; ptr; ptr = ptr->next)
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{
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PageSetLSN(BufferGetPage(ptr->buffer), recptr);
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PageSetTLI(BufferGetPage(ptr->buffer), ThisTimeLineID);
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}
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pfree(xlinfo);
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pfree(rdata);
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}
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else
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{
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for (ptr = dist; ptr; ptr = ptr->next)
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PageSetLSN(BufferGetPage(ptr->buffer), XLogRecPtrForTemp);
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}
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for (ptr = dist; ptr; ptr = ptr->next)
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{
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/* we must keep the buffer pin on the head page */
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if (BufferGetBlockNumber(ptr->buffer) != blkno)
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UnlockReleaseBuffer( ptr->buffer );
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}
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if (blkno == GIST_ROOT_BLKNO)
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{
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ItemPointerData key; /* set key for incomplete
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* insert */
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ItemPointerSet(&key, blkno, TUPLE_IS_VALID);
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gistnewroot(gv->index, buffer, res.itup, res.ituplen, &key);
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}
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END_CRIT_SECTION();
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MemoryContextReset(gv->opCtx);
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return res;
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}
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static ArrayTuple
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gistVacuumUpdate(GistVacuum *gv, BlockNumber blkno, bool needunion)
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{
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ArrayTuple res = {NULL, 0, false};
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Buffer buffer;
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Page page;
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Page page, tempPage = NULL;
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OffsetNumber i,
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maxoff;
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ItemId iid;
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int lenaddon = 4,
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curlenaddon = 0,
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ntodelete = 0;
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nOffToDelete = 0,
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nBlkToDelete = 0;
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IndexTuple idxtuple,
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*addon = NULL;
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bool needwrite = false;
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OffsetNumber todelete[MaxOffsetNumber];
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OffsetNumber offToDelete[MaxOffsetNumber];
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BlockNumber blkToDelete[MaxOffsetNumber];
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ItemPointerData *completed = NULL;
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int ncompleted = 0,
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lencompleted = 16;
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@ -76,12 +288,6 @@ gistVacuumUpdate(GistVacuum *gv, BlockNumber blkno, bool needunion)
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page = (Page) BufferGetPage(buffer);
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maxoff = PageGetMaxOffsetNumber(page);
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/*
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* XXX need to reduce scope of changes to page so we can make this
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* critical section less extensive
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*/
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START_CRIT_SECTION();
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if (GistPageIsLeaf(page))
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{
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if (GistTuplesDeleted(page))
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@ -92,13 +298,16 @@ gistVacuumUpdate(GistVacuum *gv, BlockNumber blkno, bool needunion)
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completed = (ItemPointerData *) palloc(sizeof(ItemPointerData) * lencompleted);
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addon = (IndexTuple *) palloc(sizeof(IndexTuple) * lenaddon);
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/* get copy of page to work */
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tempPage = GistPageGetCopyPage(page);
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for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i))
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{
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ArrayTuple chldtuple;
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bool needchildunion;
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iid = PageGetItemId(page, i);
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idxtuple = (IndexTuple) PageGetItem(page, iid);
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iid = PageGetItemId(tempPage, i);
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idxtuple = (IndexTuple) PageGetItem(tempPage, iid);
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needchildunion = (GistTupleIsInvalid(idxtuple)) ? true : false;
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if (needchildunion)
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@ -109,14 +318,19 @@ gistVacuumUpdate(GistVacuum *gv, BlockNumber blkno, bool needunion)
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needchildunion);
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if (chldtuple.ituplen || chldtuple.emptypage)
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{
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PageIndexTupleDelete(page, i);
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todelete[ntodelete++] = i;
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/* update tuple or/and inserts new */
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if ( chldtuple.emptypage )
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blkToDelete[nBlkToDelete++] = ItemPointerGetBlockNumber(&(idxtuple->t_tid));
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offToDelete[nOffToDelete++] = i;
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PageIndexTupleDelete(tempPage, i);
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i--;
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maxoff--;
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needwrite = needunion = true;
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if (chldtuple.ituplen)
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{
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Assert( chldtuple.emptypage == false );
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while (curlenaddon + chldtuple.ituplen >= lenaddon)
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{
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lenaddon *= 2;
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@ -150,200 +364,102 @@ gistVacuumUpdate(GistVacuum *gv, BlockNumber blkno, bool needunion)
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}
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}
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}
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Assert( maxoff == PageGetMaxOffsetNumber(tempPage) );
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if (curlenaddon)
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{
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/* insert updated tuples */
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if (gistnospace(page, addon, curlenaddon, InvalidOffsetNumber))
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{
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if (gistnospace(tempPage, addon, curlenaddon, InvalidOffsetNumber)) {
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/* there is no space on page to insert tuples */
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IndexTuple *vec;
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SplitedPageLayout *dist = NULL,
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*ptr;
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int i, veclen=0;
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MemoryContext oldCtx = MemoryContextSwitchTo(gv->opCtx);
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vec = gistextractbuffer(buffer, &veclen);
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vec = gistjoinvector(vec, &veclen, addon, curlenaddon);
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dist = gistSplit(gv->index, page, vec, veclen, &(gv->giststate));
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MemoryContextSwitchTo(oldCtx);
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if (blkno != GIST_ROOT_BLKNO) {
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/* if non-root split then we should not allocate new buffer */
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dist->buffer = buffer;
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dist->page = BufferGetPage(dist->buffer);
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GistPageGetOpaque(dist->page)->flags = 0;
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}
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res.itup = (IndexTuple *) palloc(sizeof(IndexTuple) * veclen);
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res.ituplen = 0;
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/* make new pages and fills them */
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for (ptr = dist; ptr; ptr = ptr->next) {
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char *data;
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if ( ptr->buffer == InvalidBuffer ) {
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ptr->buffer = gistNewBuffer( gv->index );
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GISTInitBuffer( ptr->buffer, 0 );
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ptr->page = BufferGetPage(ptr->buffer);
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}
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ptr->block.blkno = BufferGetBlockNumber( ptr->buffer );
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data = (char*)(ptr->list);
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for(i=0;i<ptr->block.num;i++) {
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if ( PageAddItem(ptr->page, (Item)data, IndexTupleSize((IndexTuple)data), i+FirstOffsetNumber, LP_USED) == InvalidOffsetNumber )
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elog(ERROR, "failed to add item to index page in \"%s\"", RelationGetRelationName(gv->index));
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data += IndexTupleSize((IndexTuple)data);
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}
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ItemPointerSetBlockNumber(&(ptr->itup->t_tid), ptr->block.blkno);
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res.itup[ res.ituplen ] = (IndexTuple)palloc(IndexTupleSize(ptr->itup));
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memcpy( res.itup[ res.ituplen ], ptr->itup, IndexTupleSize(ptr->itup) );
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res.ituplen++;
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MarkBufferDirty(ptr->buffer);
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}
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if (!gv->index->rd_istemp)
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{
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XLogRecPtr recptr;
|
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XLogRecData *rdata;
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ItemPointerData key; /* set key for incomplete
|
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* insert */
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char *xlinfo;
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ItemPointerSet(&key, blkno, TUPLE_IS_VALID);
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rdata = formSplitRdata(gv->index->rd_node, blkno,
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false, &key, dist);
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xlinfo = rdata->data;
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recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_PAGE_SPLIT, rdata);
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for (ptr = dist; ptr; ptr = ptr->next)
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{
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PageSetLSN(BufferGetPage(ptr->buffer), recptr);
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PageSetTLI(BufferGetPage(ptr->buffer), ThisTimeLineID);
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}
|
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pfree(xlinfo);
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pfree(rdata);
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}
|
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else
|
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{
|
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for (ptr = dist; ptr; ptr = ptr->next)
|
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{
|
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PageSetLSN(BufferGetPage(ptr->buffer), XLogRecPtrForTemp);
|
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}
|
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}
|
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|
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for (ptr = dist; ptr; ptr = ptr->next)
|
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{
|
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/* we must keep the buffer pin on the head page */
|
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if (BufferGetBlockNumber(ptr->buffer) != blkno)
|
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UnlockReleaseBuffer( ptr->buffer );
|
||||
}
|
||||
|
||||
if (blkno == GIST_ROOT_BLKNO)
|
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{
|
||||
ItemPointerData key; /* set key for incomplete
|
||||
* insert */
|
||||
|
||||
ItemPointerSet(&key, blkno, TUPLE_IS_VALID);
|
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|
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oldCtx = MemoryContextSwitchTo(gv->opCtx);
|
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gistnewroot(gv->index, buffer, res.itup, res.ituplen, &key);
|
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MemoryContextSwitchTo(oldCtx);
|
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}
|
||||
|
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needwrite = false;
|
||||
|
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MemoryContextReset(gv->opCtx);
|
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|
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needunion = false; /* gistSplit already forms unions */
|
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}
|
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else
|
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{
|
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res = vacuumSplitPage(gv, tempPage, buffer, addon, curlenaddon);
|
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tempPage=NULL; /* vacuumSplitPage() free tempPage */
|
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needwrite = needunion = false; /* gistSplit already forms unions and writes pages */
|
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} else
|
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/* enough free space */
|
||||
gistfillbuffer(gv->index, page, addon, curlenaddon, InvalidOffsetNumber);
|
||||
}
|
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gistfillbuffer(gv->index, tempPage, addon, curlenaddon, InvalidOffsetNumber);
|
||||
}
|
||||
}
|
||||
|
||||
if (needunion)
|
||||
{
|
||||
/* forms union for page or check empty */
|
||||
if (PageIsEmpty(page))
|
||||
/*
|
||||
* If page is empty, we should remove pointer to it before
|
||||
* deleting page (except root)
|
||||
*/
|
||||
|
||||
if ( blkno != GIST_ROOT_BLKNO && ( PageIsEmpty(page) || (tempPage && PageIsEmpty(tempPage)) ) ) {
|
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/*
|
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* New version of page is empty, so leave it unchanged,
|
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* upper call will mark our page as deleted.
|
||||
* In case of page split we never will be here...
|
||||
*
|
||||
* If page was empty it can't become non-empty during processing
|
||||
*/
|
||||
res.emptypage = true;
|
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UnlockReleaseBuffer(buffer);
|
||||
} else {
|
||||
/* write page and remove its childs if it need */
|
||||
|
||||
START_CRIT_SECTION();
|
||||
|
||||
if ( tempPage && needwrite ) {
|
||||
PageRestoreTempPage(tempPage, page);
|
||||
tempPage = NULL;
|
||||
}
|
||||
|
||||
/* Empty index */
|
||||
if (PageIsEmpty(page) && blkno == GIST_ROOT_BLKNO )
|
||||
{
|
||||
if (blkno == GIST_ROOT_BLKNO)
|
||||
needwrite = true;
|
||||
GistPageSetLeaf(page);
|
||||
}
|
||||
|
||||
|
||||
if (needwrite)
|
||||
{
|
||||
MarkBufferDirty(buffer);
|
||||
GistClearTuplesDeleted(page);
|
||||
|
||||
if (!gv->index->rd_istemp)
|
||||
{
|
||||
needwrite = true;
|
||||
GistPageSetLeaf(page);
|
||||
XLogRecData *rdata;
|
||||
XLogRecPtr recptr;
|
||||
char *xlinfo;
|
||||
|
||||
rdata = formUpdateRdata(gv->index->rd_node, buffer,
|
||||
offToDelete, nOffToDelete,
|
||||
addon, curlenaddon, NULL);
|
||||
xlinfo = rdata->next->data;
|
||||
|
||||
recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_PAGE_UPDATE, rdata);
|
||||
PageSetLSN(page, recptr);
|
||||
PageSetTLI(page, ThisTimeLineID);
|
||||
|
||||
pfree(xlinfo);
|
||||
pfree(rdata);
|
||||
}
|
||||
else
|
||||
{
|
||||
needwrite = true;
|
||||
res.emptypage = true;
|
||||
GistPageSetDeleted(page);
|
||||
gv->result->std.pages_deleted++;
|
||||
}
|
||||
PageSetLSN(page, XLogRecPtrForTemp);
|
||||
}
|
||||
else
|
||||
|
||||
END_CRIT_SECTION();
|
||||
|
||||
if ( needunion && !PageIsEmpty(page) )
|
||||
{
|
||||
IndexTuple *vec,
|
||||
tmp;
|
||||
int veclen = 0;
|
||||
MemoryContext oldCtx = MemoryContextSwitchTo(gv->opCtx);
|
||||
|
||||
vec = gistextractbuffer(buffer, &veclen);
|
||||
tmp = gistunion(gv->index, vec, veclen, &(gv->giststate));
|
||||
MemoryContextSwitchTo(oldCtx);
|
||||
|
||||
res.itup = (IndexTuple *) palloc(sizeof(IndexTuple));
|
||||
res.ituplen = 1;
|
||||
res.itup[0] = (IndexTuple) palloc(IndexTupleSize(tmp));
|
||||
memcpy(res.itup[0], tmp, IndexTupleSize(tmp));
|
||||
|
||||
ItemPointerSetBlockNumber(&(res.itup[0]->t_tid), blkno);
|
||||
GistTupleSetValid(res.itup[0]);
|
||||
|
||||
MemoryContextReset(gv->opCtx);
|
||||
res.itup[0] = PageMakeUnionKey(gv, buffer);
|
||||
}
|
||||
|
||||
UnlockReleaseBuffer(buffer);
|
||||
|
||||
/* delete empty children, now we havn't any links to pointed subtrees */
|
||||
for(i=0;i<nBlkToDelete;i++)
|
||||
gistDeleteSubtree(gv, blkToDelete[i]);
|
||||
|
||||
if (ncompleted && !gv->index->rd_istemp)
|
||||
gistxlogInsertCompletion(gv->index->rd_node, completed, ncompleted);
|
||||
}
|
||||
|
||||
if (needwrite)
|
||||
{
|
||||
MarkBufferDirty(buffer);
|
||||
GistClearTuplesDeleted(page);
|
||||
|
||||
if (!gv->index->rd_istemp)
|
||||
{
|
||||
XLogRecData *rdata;
|
||||
XLogRecPtr recptr;
|
||||
char *xlinfo;
|
||||
|
||||
rdata = formUpdateRdata(gv->index->rd_node, buffer,
|
||||
todelete, ntodelete, res.emptypage,
|
||||
addon, curlenaddon, NULL);
|
||||
xlinfo = rdata->data;
|
||||
|
||||
recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_PAGE_UPDATE, rdata);
|
||||
PageSetLSN(page, recptr);
|
||||
PageSetTLI(page, ThisTimeLineID);
|
||||
|
||||
pfree(xlinfo);
|
||||
pfree(rdata);
|
||||
}
|
||||
else
|
||||
PageSetLSN(page, XLogRecPtrForTemp);
|
||||
}
|
||||
|
||||
END_CRIT_SECTION();
|
||||
|
||||
UnlockReleaseBuffer(buffer);
|
||||
|
||||
if (ncompleted && !gv->index->rd_istemp)
|
||||
gistxlogInsertCompletion(gv->index->rd_node, completed, ncompleted);
|
||||
|
||||
for (i = 0; i < curlenaddon; i++)
|
||||
pfree(addon[i]);
|
||||
@ -351,6 +467,9 @@ gistVacuumUpdate(GistVacuum *gv, BlockNumber blkno, bool needunion)
|
||||
pfree(addon);
|
||||
if (completed)
|
||||
pfree(completed);
|
||||
if (tempPage)
|
||||
pfree(tempPage);
|
||||
|
||||
return res;
|
||||
}
|
||||
|
||||
@ -627,10 +746,10 @@ gistbulkdelete(PG_FUNCTION_ARGS)
|
||||
gistxlogPageUpdate *xlinfo;
|
||||
|
||||
rdata = formUpdateRdata(rel->rd_node, buffer,
|
||||
todelete, ntodelete, false,
|
||||
todelete, ntodelete,
|
||||
NULL, 0,
|
||||
NULL);
|
||||
xlinfo = (gistxlogPageUpdate *) rdata->data;
|
||||
xlinfo = (gistxlogPageUpdate *) rdata->next->data;
|
||||
|
||||
recptr = XLogInsert(RM_GIST_ID, XLOG_GIST_PAGE_UPDATE, rdata);
|
||||
PageSetLSN(page, recptr);
|
||||
|
||||
Reference in New Issue
Block a user