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mdbx: новый код обновления GC.

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Леонид Юрьев (Leonid Yuriev)
2025-04-26 00:15:41 +03:00
parent 011c3072da
commit 2b36fd5974
24 changed files with 1493 additions and 905 deletions
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36
src/internals.h
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@@ -214,10 +214,9 @@ struct MDBX_txn {
troika_t troika;
pnl_t __restrict repnl; /* Reclaimed GC pages */
struct {
/* The list of reclaimed txn-ids from GC */
txl_t __restrict retxl;
txnid_t last_reclaimed; /* ID of last used record */
uint64_t time_acc;
rkl_t reclaimed; /* The list of reclaimed txn-ids from GC */
uint64_t spent; /* Time spent reading and searching GC */
rkl_t comeback; /* The list of ids of records returned into GC during commit, etc */
} gc;
bool prefault_write_activated;
#if MDBX_ENABLE_REFUND
@@ -287,13 +286,14 @@ struct MDBX_cursor {
};
/* флаги проверки, в том числе биты для проверки типа листовых страниц. */
uint8_t checking;
uint8_t pad;
/* Указывает на txn->dbi_state[] для DBI этого курсора.
* Модификатор __restrict тут полезен и безопасен в текущем понимании,
* так как пересечение возможно только с dbi_state транзакции,
* и происходит по-чтению до последующего изменения/записи. */
uint8_t *__restrict dbi_state;
/* Связь списка отслеживания курсоров в транзакции */
/* Связь списка отслеживания курсоров в транзакции. */
MDBX_txn *txn;
/* Указывает на tree->dbs[] для DBI этого курсора. */
tree_t *tree;
@@ -362,15 +362,14 @@ struct MDBX_env {
uint16_t subpage_reserve_prereq;
uint16_t subpage_reserve_limit;
atomic_pgno_t mlocked_pgno;
uint8_t ps2ln; /* log2 of DB page size */
int8_t stuck_meta; /* recovery-only: target meta page or less that zero */
uint16_t merge_threshold, merge_threshold_gc; /* pages emptier than this are
candidates for merging */
unsigned max_readers; /* size of the reader table */
MDBX_dbi max_dbi; /* size of the DB table */
uint32_t pid; /* process ID of this env */
osal_thread_key_t me_txkey; /* thread-key for readers */
struct { /* path to the DB files */
uint8_t ps2ln; /* log2 of DB page size */
int8_t stuck_meta; /* recovery-only: target meta page or less that zero */
uint16_t merge_threshold; /* pages emptier than this are candidates for merging */
unsigned max_readers; /* size of the reader table */
MDBX_dbi max_dbi; /* size of the DB table */
uint32_t pid; /* process ID of this env */
osal_thread_key_t me_txkey; /* thread-key for readers */
struct { /* path to the DB files */
pathchar_t *lck, *dxb, *specified;
void *buffer;
} pathname;
@@ -467,6 +466,9 @@ struct MDBX_env {
/* --------------------------------------------------- mostly volatile part */
MDBX_txn *txn; /* current write transaction */
struct {
txnid_t detent;
} gc;
osal_fastmutex_t dbi_lock;
unsigned n_dbi; /* number of DBs opened */
@@ -549,11 +551,7 @@ MDBX_MAYBE_UNUSED static void static_checks(void) {
STATIC_ASSERT(sizeof(clc_t) == 3 * sizeof(void *));
STATIC_ASSERT(sizeof(kvx_t) == 8 * sizeof(void *));
#if MDBX_WORDBITS == 64
#define KVX_SIZE_LN2 6
#else
#define KVX_SIZE_LN2 5
#endif
#define KVX_SIZE_LN2 MDBX_WORDBITS_LN2
STATIC_ASSERT(sizeof(kvx_t) == (1u << KVX_SIZE_LN2));
}
#endif /* Disabled for MSVC 19.0 (VisualStudio 2015) */