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mdbx: add shared cache for oldest reader's txnid.

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Change-Id: I48cbc778b873445dffa8ecef1fc3633e0193131f
This commit is contained in:
Leo Yuriev
2017-06-14 23:33:13 +03:00
parent c01aeb5c68
commit 81661ff952
2 changed files with 78 additions and 64 deletions
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80
src/bits.h
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@@ -365,18 +365,35 @@ typedef struct MDBX_lockinfo {
/* Flags which environment was opened. */
volatile uint32_t mti_envmode;
union {
#ifdef MDBX_OSAL_LOCK
MDBX_OSAL_LOCK mti_wmutex;
MDBX_OSAL_LOCK mti_wmutex;
#endif
uint64_t align_wmutex;
};
/* The number of slots that have been used in the reader table.
* This always records the maximum count, it is not decremented
* when readers release their slots. */
volatile unsigned __cache_aligned mti_numreaders;
union {
/* The number of slots that have been used in the reader table.
* This always records the maximum count, it is not decremented
* when readers release their slots. */
volatile unsigned __cache_aligned mti_numreaders;
uint64_t align_numreaders;
};
union {
#ifdef MDBX_OSAL_LOCK
/* Mutex protecting access to this table. */
MDBX_OSAL_LOCK mti_rmutex;
/* Mutex protecting access to this table. */
MDBX_OSAL_LOCK mti_rmutex;
#endif
uint64_t align_rmutex;
};
union {
volatile txnid_t mti_oldest;
uint64_t align_oldest;
};
uint8_t pad_align[MDBX_CACHELINE_SIZE - sizeof(uint64_t) * 6];
MDBX_reader __cache_aligned mti_readers[1];
} MDBX_lockinfo;
@@ -635,23 +652,23 @@ struct MDBX_env {
/* Max MDBX_lockinfo.mti_numreaders of interest to mdbx_env_close() */
unsigned me_close_readers;
mdbx_fastmutex_t me_dbi_lock;
MDBX_dbi me_numdbs; /* number of DBs opened */
MDBX_dbi me_maxdbs; /* size of the DB table */
mdbx_pid_t me_pid; /* process ID of this env */
char *me_path; /* path to the DB files */
char *me_map; /* the memory map of the data file */
MDBX_lockinfo *me_lck; /* the memory map of the lock file, never NULL */
void *me_pbuf; /* scratch area for DUPSORT put() */
MDBX_txn *me_txn; /* current write transaction */
MDBX_txn *me_txn0; /* prealloc'd write transaction */
size_t me_mapsize; /* size of the data memory map */
pgno_t me_maxpg; /* me_mapsize / me_psize */
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_thread_key_t me_txkey; /* thread-key for readers */
txnid_t me_pgoldest; /* ID of oldest reader last time we looked */
MDBX_pgstate me_pgstate; /* state of old pages from freeDB */
MDBX_dbi me_numdbs; /* number of DBs opened */
MDBX_dbi me_maxdbs; /* size of the DB table */
mdbx_pid_t me_pid; /* process ID of this env */
char *me_path; /* path to the DB files */
char *me_map; /* the memory map of the data file */
MDBX_lockinfo *me_lck; /* the memory map of the lock file, never NULL */
void *me_pbuf; /* scratch area for DUPSORT put() */
MDBX_txn *me_txn; /* current write transaction */
MDBX_txn *me_txn0; /* prealloc'd write transaction */
size_t me_mapsize; /* size of the data memory map */
pgno_t me_maxpg; /* me_mapsize / me_psize */
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_thread_key_t me_txkey; /* thread-key for readers */
volatile txnid_t *me_oldest; /* ID of oldest reader last time we looked */
MDBX_pgstate me_pgstate; /* state of old pages from freeDB */
#define me_pglast me_pgstate.mf_pglast
#define me_pghead me_pgstate.mf_pghead
MDBX_page *me_dpages; /* list of malloc'd blocks for re-use */
@@ -663,16 +680,17 @@ struct MDBX_env {
unsigned me_maxfree_1pg;
/* Max size of a node on a page */
unsigned me_nodemax;
unsigned me_maxkey_limit; /* max size of a key */
mdbx_pid_t me_live_reader; /* have liveness lock in reader table */
void *me_userctx; /* User-settable context */
unsigned me_maxkey_limit; /* max size of a key */
mdbx_pid_t me_live_reader; /* have liveness lock in reader table */
void *me_userctx; /* User-settable context */
size_t me_sync_pending; /* Total dirty/non-sync'ed bytes
* since the last mdbx_env_sync() */
size_t me_sync_threshold; /* Treshold of above to force synchronous flush */
MDBX_oom_func *me_oom_func; /* Callback for kicking laggard readers */
txnid_t me_oldest_stub;
#if MDBX_DEBUG
MDBX_assert_func *me_assert_func; /* Callback for assertion failures */
#endif
size_t me_sync_pending; /* Total dirty/non-sync'ed bytes
* since the last mdbx_env_sync() */
size_t me_sync_threshold; /* Treshold of above to force synchronous flush */
MDBX_oom_func *me_oom_func; /* Callback for kicking laggard readers */
#ifdef USE_VALGRIND
int me_valgrind_handle;
#endif