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more tdb

This commit is contained in:
Hongze Cheng 2022-01-21 09:35:33 +00:00
parent e9984c992d
commit daa29bca42
2 changed files with 39 additions and 8 deletions
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36
source/libs/tdb/src/db/tdb_mpool.c
View File

@ -21,6 +21,7 @@ static void tdbMPoolUnregFile(TDB_MPOOL *mp, TDB_MPFILE *mpf);
static TDB_MPFILE *tdbMPoolGetFile(TDB_MPOOL *mp, uint8_t *fileid);
static int tdbMPoolFileReadPage(TDB_MPFILE *mpf, pgno_t pgno, void *p);
static int tdbMPoolFileWritePage(TDB_MPFILE *mpf, pgno_t pgno, const void *p);
static void tdbMPoolClockEvictPage(TDB_MPOOL *mp, pg_t **pagepp);
int tdbMPoolOpen(TDB_MPOOL **mpp, uint64_t cachesize, pgsize_t pgsize) {
TDB_MPOOL *mp = NULL;
@ -44,6 +45,7 @@ int tdbMPoolOpen(TDB_MPOOL **mpp, uint64_t cachesize, pgsize_t pgsize) {
mp->cachesize = cachesize;
mp->pgsize = pgsize;
mp->npages = cachesize / pgsize;
mp->clockHand = 0;
TD_DLIST_INIT(&mp->freeList);
@ -193,10 +195,11 @@ int tdbMPoolFileGetPage(TDB_MPFILE *mpf, pgno_t pgno, void *addr) {
TD_DLIST_POP_WITH_FIELD(&(mp->freeList), pagep, free);
} else {
// no free page available
// pagep = tdbMpoolEvict(mp);
tdbMPoolClockEvictPage(mp, &pagep);
if (pagep) {
} else {
// TODO: Cannot find a page to evict
if (pagep->dirty) {
// TODO: Handle dirty page eviction
}
}
}
@ -346,4 +349,31 @@ static int tdbMPoolFileWritePage(TDB_MPFILE *mpf, pgno_t pgno, const void *p) {
// TODO: handle error
return 0;
}
static void tdbMPoolClockEvictPage(TDB_MPOOL *mp, pg_t **pagepp) {
pg_t * pagep;
frame_id_t och;
*pagepp = NULL;
och = mp->clockHand;
do {
pagep = mp->pages + mp->clockHand;
mp->clockHand = (mp->clockHand + 1) % mp->npages;
if (pagep->pinRef == 0) {
if (pagep->rbit == 1) {
pagep->rbit = 0;
} else {
break;
}
}
if (mp->clockHand == och) {
return;
}
} while (1);
*pagepp = pagep;
}

11
source/libs/tdb/src/inc/tdb_mpool.h
View File

@ -45,11 +45,12 @@ typedef struct {
TD_DLIST(TDB_MPFILE);
} mpf_bucket_t;
struct TDB_MPOOL {
int64_t cachesize;
pgsize_t pgsize;
int32_t npages;
pg_t * pages;
pg_list_t freeList;
int64_t cachesize;
pgsize_t pgsize;
int32_t npages;
pg_t * pages;
pg_list_t freeList;
frame_id_t clockHand;
struct {
int32_t nbucket;
pg_list_t *hashtab;