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First non-stub implementation of shared free space map. It's not super

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useful as yet, since its primary source of information is (full) VACUUM,
which makes a concerted effort to get rid of free space before telling
the map about it ... next stop is concurrent VACUUM ...
This commit is contained in:
Tom Lane
2001-07-02 20:50:46 +00:00
parent 755e367cb2
commit 42748087c1
6 changed files with 994 additions and 39 deletions
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55
src/backend/commands/vacuum.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.200 2001/06/29 20:14:27 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.201 2001/07/02 20:50:46 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -37,6 +37,7 @@
#include "commands/vacuum.h"
#include "miscadmin.h"
#include "nodes/execnodes.h"
#include "storage/freespace.h"
#include "storage/sinval.h"
#include "storage/smgr.h"
#include "tcop/tcopprot.h"
@@ -146,6 +147,8 @@ static void vacuum_index(VacPageList vacpagelist, Relation indrel,
double num_tuples, int keep_tuples);
static void scan_index(Relation indrel, double num_tuples);
static VacPage tid_reaped(ItemPointer itemptr, VacPageList vacpagelist);
static void vac_update_fsm(Relation onerel, VacPageList fraged_pages,
BlockNumber rel_pages);
static VacPage copy_vac_page(VacPage vacpage);
static void vpage_insert(VacPageList vacpagelist, VacPage vpnew);
static void get_indices(Relation relation, int *nindices, Relation **Irel);
@@ -579,6 +582,9 @@ vacuum_rel(Oid relid)
activate_indexes_of_a_table(relid, true);
#endif /* NOT_USED */
/* update shared free space map with final free space info */
vac_update_fsm(onerel, &fraged_pages, vacrelstats->rel_pages);
/* all done with this class, but hold lock until commit */
heap_close(onerel, NoLock);
@@ -1157,6 +1163,10 @@ repair_frag(VRelStats *vacrelstats, Relation onerel,
* useful as move targets, since we only want to move down. Note
* that since we stop the outer loop at last_move_dest_block, pages
* removed here cannot have had anything moved onto them already.
*
* Also note that we don't change the stored fraged_pages list,
* only our local variable num_fraged_pages; so the forgotten pages
* are still available to be loaded into the free space map later.
*/
while (num_fraged_pages > 0 &&
fraged_pages->pagedesc[num_fraged_pages-1]->blkno >= blkno)
@@ -2080,6 +2090,8 @@ repair_frag(VRelStats *vacrelstats, Relation onerel,
if (blkno < nblocks)
{
blkno = smgrtruncate(DEFAULT_SMGR, onerel, blkno);
onerel->rd_nblocks = blkno; /* update relcache immediately */
onerel->rd_targblock = InvalidBlockNumber;
vacrelstats->rel_pages = blkno; /* set new number of blocks */
}
@@ -2145,6 +2157,8 @@ vacuum_heap(VRelStats *vacrelstats, Relation onerel, VacPageList vacuum_pages)
RelationGetRelationName(onerel),
vacrelstats->rel_pages, relblocks);
relblocks = smgrtruncate(DEFAULT_SMGR, onerel, relblocks);
onerel->rd_nblocks = relblocks; /* update relcache immediately */
onerel->rd_targblock = InvalidBlockNumber;
vacrelstats->rel_pages = relblocks; /* set new number of
* blocks */
}
@@ -2414,6 +2428,45 @@ vac_update_relstats(Oid relid, BlockNumber num_pages, double num_tuples,
heap_close(rd, RowExclusiveLock);
}
/*
* Update the shared Free Space Map with the info we now have about
* free space in the relation, discarding any old info the map may have.
*/
static void
vac_update_fsm(Relation onerel, VacPageList fraged_pages,
BlockNumber rel_pages)
{
int nPages = fraged_pages->num_pages;
int i;
BlockNumber *pages;
Size *spaceAvail;
/* +1 to avoid palloc(0) */
pages = (BlockNumber *) palloc((nPages + 1) * sizeof(BlockNumber));
spaceAvail = (Size *) palloc((nPages + 1) * sizeof(Size));
for (i = 0; i < nPages; i++)
{
pages[i] = fraged_pages->pagedesc[i]->blkno;
spaceAvail[i] = fraged_pages->pagedesc[i]->free;
/*
* fraged_pages may contain entries for pages that we later decided
* to truncate from the relation; don't enter them into the map!
*/
if (pages[i] >= rel_pages)
{
nPages = i;
break;
}
}
MultiRecordFreeSpace(&onerel->rd_node,
0, MaxBlockNumber,
nPages, pages, spaceAvail);
pfree(pages);
pfree(spaceAvail);
}
/* Copy a VacPage structure */
static VacPage
copy_vac_page(VacPage vacpage)