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mdbx: reduce number of memory fences in the hot paths.

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This commit is contained in:
Леонид Юрьев (Leonid Yuriev)
2022-08-11 17:09:13 +03:00
parent 34a4e7e102
commit 1c5ef060c5
2 changed files with 97 additions and 47 deletions
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16
src/internals.h
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@@ -337,8 +337,8 @@ atomic_store32(MDBX_atomic_uint32_t *p, const uint32_t value,
#endif /* atomic_store32 */
#ifndef atomic_load32
MDBX_MAYBE_UNUSED static __always_inline uint32_t
atomic_load32(const MDBX_atomic_uint32_t *p, enum MDBX_memory_order order) {
MDBX_MAYBE_UNUSED static __always_inline uint32_t atomic_load32(
const volatile MDBX_atomic_uint32_t *p, enum MDBX_memory_order order) {
STATIC_ASSERT(sizeof(MDBX_atomic_uint32_t) == 4);
#ifdef MDBX_HAVE_C11ATOMICS
assert(atomic_is_lock_free(MDBX_c11a_ro(uint32_t, p)));
@@ -455,7 +455,7 @@ typedef struct MDBX_meta {
uint32_t mm_magic_and_version[2];
/* txnid that committed this page, the first of a two-phase-update pair */
uint32_t mm_txnid_a[2];
MDBX_atomic_uint32_t mm_txnid_a[2];
uint16_t mm_extra_flags; /* extra DB flags, zero (nothing) for now */
uint8_t mm_validator_id; /* ID of checksum and page validation method,
@@ -478,7 +478,7 @@ typedef struct MDBX_meta {
uint32_t mm_datasync_sign[2];
/* txnid that committed this page, the second of a two-phase-update pair */
uint32_t mm_txnid_b[2];
MDBX_atomic_uint32_t mm_txnid_b[2];
/* Number of non-meta pages which were put in GC after COW. May be 0 in case
* DB was previously handled by libmdbx without corresponding feature.
@@ -959,7 +959,7 @@ struct MDBX_txn {
/* Array of MDBX_db records for each known DB */
MDBX_db *mt_dbs;
/* Array of sequence numbers for each DB handle */
unsigned *mt_dbiseqs;
MDBX_atomic_uint32_t *mt_dbiseqs;
/* Transaction DBI Flags */
#define DBI_DIRTY MDBX_DBI_DIRTY /* DB was written in this txn */
@@ -1147,9 +1147,9 @@ struct MDBX_env {
void *me_pbuf; /* scratch area for DUPSORT put() */
MDBX_txn *me_txn0; /* preallocated write transaction */
MDBX_dbx *me_dbxs; /* array of static DB info */
uint16_t *me_dbflags; /* array of flags from MDBX_db.md_flags */
unsigned *me_dbiseqs; /* array of dbi sequence numbers */
MDBX_dbx *me_dbxs; /* array of static DB info */
uint16_t *me_dbflags; /* array of flags from MDBX_db.md_flags */
MDBX_atomic_uint32_t *me_dbiseqs; /* array of dbi sequence numbers */
unsigned
me_maxgc_ov1page; /* Number of pgno_t fit in a single overflow page */
uint32_t me_live_reader; /* have liveness lock in reader table */