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mdbx: rework sync_timestamp.

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Change-Id: I0e9ef9722735f89055814ba7eec0610ecdea8f0a
This commit is contained in:
Leonid Yuriev 2019-10-01 15:01:33 +03:00
parent 5693fad51d
commit f0246463c0
2 changed files with 18 additions and 19 deletions
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23
src/elements/core.c
View File

@ -3491,9 +3491,10 @@ __cold int mdbx_env_sync_ex(MDBX_env *env, int force, int nonblock) {
pgno_t unsynced_pages = *env->me_unsynced_pages;
if (!META_IS_STEADY(head) || unsynced_pages) {
const pgno_t autosync_threshold = *env->me_autosync_threshold;
const uint64_t unsynced_timeout = *env->me_unsynced_timeout;
const uint64_t autosync_period = *env->me_autosync_period;
if (force || (autosync_threshold && unsynced_pages >= autosync_threshold) ||
(unsynced_timeout && mdbx_osal_monotime() >= unsynced_timeout))
(autosync_period &&
mdbx_osal_monotime() - *env->me_sync_timestamp >= autosync_period))
flags &= MDBX_WRITEMAP /* clear flags for full steady sync */;
if (outside_txn) {
@ -5999,9 +6000,10 @@ static int mdbx_sync_locked(MDBX_env *env, unsigned flags,
if (flags & (MDBX_NOSYNC | MDBX_MAPASYNC)) {
/* Check auto-sync conditions */
const pgno_t autosync_threshold = *env->me_autosync_threshold;
const uint64_t unsynced_timeout = *env->me_unsynced_timeout;
const uint64_t autosync_period = *env->me_autosync_period;
if ((autosync_threshold && *env->me_unsynced_pages >= autosync_threshold) ||
(unsynced_timeout && mdbx_osal_monotime() >= unsynced_timeout))
(autosync_period &&
mdbx_osal_monotime() - *env->me_sync_timestamp >= autosync_period))
flags &= MDBX_WRITEMAP | MDBX_SHRINK_ALLOWED; /* force steady */
}
@ -6090,12 +6092,9 @@ static int mdbx_sync_locked(MDBX_env *env, unsigned flags,
if (rc == MDBX_RESULT_FALSE /* carry steady */) {
pending->mm_datasync_sign = mdbx_meta_sign(pending);
*env->me_unsynced_pages = 0;
*env->me_unsynced_timeout = 0;
*env->me_sync_timestamp = mdbx_osal_monotime();
} else {
assert(rc == MDBX_RESULT_TRUE /* carry non-steady */);
const uint64_t autosync_period = *env->me_autosync_period;
if (autosync_period && *env->me_unsynced_timeout == 0)
*env->me_unsynced_timeout = mdbx_osal_monotime() + autosync_period;
pending->mm_datasync_sign = F_ISSET(env->me_flags, MDBX_UTTERLY_NOSYNC)
? MDBX_DATASIGN_NONE
: MDBX_DATASIGN_WEAK;
@ -7176,7 +7175,7 @@ static int __cold mdbx_setup_lck(MDBX_env *env, char *lck_pathname,
/* end of a locked section ---------------------------------------------- */
env->me_oldest = &env->me_lckless_stub.oldest;
env->me_unsynced_timeout = &env->me_lckless_stub.unsynced_timeout;
env->me_sync_timestamp = &env->me_lckless_stub.sync_timestamp;
env->me_autosync_period = &env->me_lckless_stub.autosync_period;
env->me_unsynced_pages = &env->me_lckless_stub.autosync_pending;
env->me_autosync_threshold = &env->me_lckless_stub.autosync_threshold;
@ -7328,7 +7327,7 @@ static int __cold mdbx_setup_lck(MDBX_env *env, char *lck_pathname,
mdbx_assert(env, !MDBX_IS_ERROR(lck_seize_rc));
env->me_oldest = &env->me_lck->mti_oldest_reader;
env->me_unsynced_timeout = &env->me_lck->mti_unsynced_timeout;
env->me_sync_timestamp = &env->me_lck->mti_sync_timestamp;
env->me_autosync_period = &env->me_lck->mti_autosync_period;
env->me_unsynced_pages = &env->me_lck->mti_unsynced_pages;
env->me_autosync_threshold = &env->me_lck->mti_autosync_threshold;
@ -7601,10 +7600,12 @@ static int __cold mdbx_env_close0(MDBX_env *env) {
if (env->me_lck)
mdbx_munmap(&env->me_lck_mmap);
env->me_oldest = nullptr;
env->me_unsynced_timeout = nullptr;
env->me_sync_timestamp = nullptr;
env->me_autosync_period = nullptr;
env->me_unsynced_pages = nullptr;
env->me_autosync_threshold = nullptr;
env->me_discarded_tail = nullptr;
env->me_meta_sync_txnid = nullptr;
if (env->me_lfd != INVALID_HANDLE_VALUE) {
(void)mdbx_closefile(env->me_lfd);

14
src/elements/internals.h
View File

@ -546,12 +546,10 @@ typedef struct MDBX_lockinfo {
volatile txnid_t mti_oldest_reader;
/* Timestamp for auto-sync feature, i.e. the steady checkpoint should be
* created at the first commit that will be not early this timestamp.
* The time value is represented in a suitable system-dependent form, for
* example clock_gettime(CLOCK_BOOTTIME) or clock_gettime(CLOCK_MONOTONIC).
* Zero means timed auto-sync is not pending. */
volatile uint64_t mti_unsynced_timeout;
/* Timestamp of the last steady sync. Value is represented in a suitable
* system-dependent form, for example clock_gettime(CLOCK_BOOTTIME) or
* clock_gettime(CLOCK_MONOTONIC). */
volatile uint64_t mti_sync_timestamp;
/* Number un-synced-with-disk pages for auto-sync feature. */
volatile pgno_t mti_unsynced_pages;
@ -935,7 +933,7 @@ struct MDBX_env {
unsigned me_maxkey_limit; /* max size of a key */
uint32_t me_live_reader; /* have liveness lock in reader table */
void *me_userctx; /* User-settable context */
volatile uint64_t *me_unsynced_timeout;
volatile uint64_t *me_sync_timestamp;
volatile uint64_t *me_autosync_period;
volatile pgno_t *me_unsynced_pages;
volatile pgno_t *me_autosync_threshold;
@ -947,7 +945,7 @@ struct MDBX_env {
MDBX_OSAL_LOCK wmutex;
#endif
txnid_t oldest;
uint64_t unsynced_timeout;
uint64_t sync_timestamp;
uint64_t autosync_period;
pgno_t autosync_pending;
pgno_t autosync_threshold;