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mdbx: statistics of page operations.

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Related to https://github.com/erthink/libmdbx/issues/186

Change-Id: Ia00e6e0df9a65f880517ca33e7f444a0526b96e1
This commit is contained in:
Leonid Yuriev
2021-04-27 18:02:11 +03:00
parent 3bbf5d03e2
commit f95a277ac5
5 changed files with 156 additions and 15 deletions
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44
src/internals.h
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@@ -331,8 +331,13 @@ atomic_store64(MDBX_atomic_uint64_t *p, const uint64_t value,
return value;
}
static __maybe_unused __always_inline uint64_t
atomic_load64(const MDBX_atomic_uint64_t *p, enum MDBX_memory_order order) {
static __maybe_unused
#if MDBX_64BIT_ATOMIC
__always_inline
#endif /* MDBX_64BIT_ATOMIC */
uint64_t
atomic_load64(const MDBX_atomic_uint64_t *p,
enum MDBX_memory_order order) {
STATIC_ASSERT(sizeof(MDBX_atomic_uint64_t) == 8);
#if MDBX_64BIT_ATOMIC
#ifdef MDBX_HAVE_C11ATOMICS
@@ -376,10 +381,10 @@ atomic_load64(const MDBX_atomic_uint64_t *p, enum MDBX_memory_order order) {
* recognizable, and it will reflect any byte order mismatches. */
#define MDBX_MAGIC UINT64_C(/* 56-bit prime */ 0x59659DBDEF4C11)
/* The version number for a database's datafile format. */
/* FROZEN: The version number for a database's datafile format. */
#define MDBX_DATA_VERSION 2
/* The version number for a database's lockfile format. */
#define MDBX_LOCK_VERSION 3
#define MDBX_LOCK_VERSION 4
/* handle for the DB used to track free pages. */
#define FREE_DBI 0
@@ -571,6 +576,23 @@ typedef struct MDBX_page {
#pragma pack(pop)
#if MDBX_ENABLE_PGOP_STAT
/* Statistics of page operations overall of all (running, completed and aborted)
* transactions */
typedef struct {
MDBX_atomic_uint64_t newly; /* Quantity of a new pages added */
MDBX_atomic_uint64_t cow; /* Quantity of pages copied for update */
MDBX_atomic_uint64_t clone; /* Quantity of parent's dirty pages clones
for nested transactions */
MDBX_atomic_uint64_t split; /* Page splits */
MDBX_atomic_uint64_t merge; /* Page merges */
MDBX_atomic_uint64_t spill; /* Quantity of spilled dirty pages */
MDBX_atomic_uint64_t unspill; /* Quantity of unspilled/reloaded pages */
MDBX_atomic_uint64_t
wops; /* Number of explicit write operations (not a pages) to a disk */
} MDBX_pgop_stat_t;
#endif /* MDBX_ENABLE_PGOP_STAT */
#if MDBX_LOCKING == MDBX_LOCKING_WIN32FILES
#define MDBX_CLOCK_SIGN UINT32_C(0xF10C)
typedef void mdbx_ipclock_t;
@@ -702,6 +724,14 @@ typedef struct MDBX_lockinfo {
alignas(MDBX_CACHELINE_SIZE) /* cacheline ---------------------------------*/
#if MDBX_ENABLE_PGOP_STAT
/* Statistics of costly ops of all (running, completed and aborted)
* transactions */
MDBX_pgop_stat_t mti_pgop_stat;
#endif /* MDBX_ENABLE_PGOP_STAT*/
alignas(MDBX_CACHELINE_SIZE) /* cacheline ---------------------------------*/
/* Write transaction lock. */
#if MDBX_LOCKING > 0
mdbx_ipclock_t mti_wlock;
@@ -1134,6 +1164,9 @@ struct MDBX_env {
atomic_pgno_t *me_discarded_tail;
pgno_t *me_readahead_anchor;
MDBX_atomic_uint32_t *me_meta_sync_txnid;
#if MDBX_ENABLE_PGOP_STAT
MDBX_pgop_stat_t *me_pgop_stat;
#endif /* MDBX_ENABLE_PGOP_STAT*/
MDBX_hsr_func *me_hsr_callback; /* Callback for kicking laggard readers */
struct {
unsigned dp_reserve_limit;
@@ -1202,6 +1235,9 @@ struct MDBX_env {
atomic_pgno_t discarded_tail;
pgno_t readahead_anchor;
MDBX_atomic_uint32_t meta_sync_txnid;
#if MDBX_ENABLE_PGOP_STAT
MDBX_pgop_stat_t pgop_stat;
#endif /* MDBX_ENABLE_PGOP_STAT*/
} me_lckless_stub;
/* -------------------------------------------------------------- debugging */