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mdbx: add MDBX_opt_spill_parent4child_denominator runtime option.

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More for https://github.com/erthink/libmdbx/issues/128

Change-Id: If1549c3855eb59c107eb115e6dbca515e81644f9
This commit is contained in:
Leonid Yuriev
2021-01-22 18:18:52 +03:00
parent 56aaad03bc
commit b82d1d5063
3 changed files with 42 additions and 0 deletions
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18
src/core.c
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@@ -6893,6 +6893,15 @@ int mdbx_txn_begin_ex(MDBX_env *env, MDBX_txn *parent, MDBX_txn_flags_t flags,
MDBX_TXN_RDONLY | MDBX_WRITEMAP | MDBX_TXN_BLOCKED);
if (unlikely(rc != MDBX_SUCCESS))
return rc;
if (env->me_options.spill_parent4child_denominator) {
/* Spill dirty-pages of parent to provide dirtyroom for child txn */
rc = mdbx_txn_spill(parent, nullptr,
parent->tw.dirtylist->length /
env->me_options.spill_parent4child_denominator);
if (unlikely(rc != MDBX_SUCCESS))
return rc;
}
mdbx_tassert(parent, mdbx_audit_ex(parent, 0, false) == 0);
flags |= parent->mt_flags & (MDBX_TXN_RW_BEGIN_FLAGS | MDBX_TXN_SPILLS);
@@ -9922,6 +9931,7 @@ __cold int mdbx_env_create(MDBX_env **penv) {
env->me_options.dp_initial = env->me_options.dp_limit;
env->me_options.spill_max_denominator = 8;
env->me_options.spill_min_denominator = 8;
env->me_options.spill_parent4child_denominator = 0;
int rc;
const size_t os_psize = mdbx_syspagesize();
@@ -20462,6 +20472,11 @@ __cold int mdbx_env_set_option(MDBX_env *env, const MDBX_option_t option,
return MDBX_EINVAL;
env->me_options.spill_min_denominator = (uint8_t)value;
break;
case MDBX_opt_spill_parent4child_denominator:
if (unlikely(value > 255))
return MDBX_EINVAL;
env->me_options.spill_parent4child_denominator = (uint8_t)value;
break;
default:
return MDBX_EINVAL;
@@ -20522,6 +20537,9 @@ __cold int mdbx_env_get_option(const MDBX_env *env, const MDBX_option_t option,
case MDBX_opt_spill_min_denominator:
*value = env->me_options.spill_min_denominator;
break;
case MDBX_opt_spill_parent4child_denominator:
*value = env->me_options.spill_parent4child_denominator;
break;
default:
return MDBX_EINVAL;

1
src/internals.h
View File

@@ -985,6 +985,7 @@ struct MDBX_env {
unsigned dp_initial;
uint8_t spill_max_denominator;
uint8_t spill_min_denominator;
uint8_t spill_parent4child_denominator;
} me_options;
struct {
#if MDBX_LOCKING > 0