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Code Issues Releases Wiki Activity

Improve performance for delegation heavy answers and also general query performance (#44029)

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This commit is contained in:
Mukund Sivaraman
2017-04-22 08:25:10 +05:30
parent 4c31eda5e1
commit 03be5a6b4e
134 changed files with 1619 additions and 4420 deletions
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61
lib/isc/hash.c
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@@ -397,6 +397,7 @@ isc__hash_setvec(const isc_uint16_t *vec) {
static isc_uint32_t fnv_offset_basis;
static isc_once_t fnv_once = ISC_ONCE_INIT;
static isc_boolean_t fnv_initialized = ISC_FALSE;
static void
fnv_initialize(void) {
@@ -408,11 +409,14 @@ fnv_initialize(void) {
while (fnv_offset_basis == 0) {
isc_random_get(&fnv_offset_basis);
}
fnv_initialized = ISC_TRUE;
}
const void *
isc_hash_get_initializer(void) {
RUNTIME_CHECK(isc_once_do(&fnv_once, fnv_initialize) == ISC_R_SUCCESS);
if (ISC_UNLIKELY(!fnv_initialized))
RUNTIME_CHECK(isc_once_do(&fnv_once, fnv_initialize) == ISC_R_SUCCESS);
return (&fnv_offset_basis);
}
@@ -425,7 +429,8 @@ isc_hash_set_initializer(const void *initializer) {
* Ensure that fnv_initialize() is not called after
* isc_hash_set_initializer() is called.
*/
RUNTIME_CHECK(isc_once_do(&fnv_once, fnv_initialize) == ISC_R_SUCCESS);
if (ISC_UNLIKELY(!fnv_initialized))
RUNTIME_CHECK(isc_once_do(&fnv_once, fnv_initialize) == ISC_R_SUCCESS);
fnv_offset_basis = *((const unsigned int *) initializer);
}
@@ -440,7 +445,9 @@ isc_hash_function(const void *data, size_t length,
const unsigned char *be;
REQUIRE(length == 0 || data != NULL);
RUNTIME_CHECK(isc_once_do(&fnv_once, fnv_initialize) == ISC_R_SUCCESS);
if (ISC_UNLIKELY(!fnv_initialized))
RUNTIME_CHECK(isc_once_do(&fnv_once, fnv_initialize) == ISC_R_SUCCESS);
hval = ISC_UNLIKELY(previous_hashp != NULL) ?
*previous_hashp : fnv_offset_basis;
@@ -461,35 +468,35 @@ isc_hash_function(const void *data, size_t length,
*/
if (case_sensitive) {
while (bp < be - 4) {
hval ^= (isc_uint32_t) bp[0];
while (bp <= be - 4) {
hval ^= bp[0];
hval *= 16777619;
hval ^= (isc_uint32_t) bp[1];
hval ^= bp[1];
hval *= 16777619;
hval ^= (isc_uint32_t) bp[2];
hval ^= bp[2];
hval *= 16777619;
hval ^= (isc_uint32_t) bp[3];
hval ^= bp[3];
hval *= 16777619;
bp += 4;
}
while (bp < be) {
hval ^= (isc_uint32_t) *bp++;
hval ^= *bp++;
hval *= 16777619;
}
} else {
while (bp < be - 4) {
hval ^= (isc_uint32_t) maptolower[bp[0]];
while (bp <= be - 4) {
hval ^= maptolower[bp[0]];
hval *= 16777619;
hval ^= (isc_uint32_t) maptolower[bp[1]];
hval ^= maptolower[bp[1]];
hval *= 16777619;
hval ^= (isc_uint32_t) maptolower[bp[2]];
hval ^= maptolower[bp[2]];
hval *= 16777619;
hval ^= (isc_uint32_t) maptolower[bp[3]];
hval ^= maptolower[bp[3]];
hval *= 16777619;
bp += 4;
}
while (bp < be) {
hval ^= (isc_uint32_t) maptolower[*bp++];
hval ^= maptolower[*bp++];
hval *= 16777619;
}
}
@@ -507,7 +514,9 @@ isc_hash_function_reverse(const void *data, size_t length,
const unsigned char *be;
REQUIRE(length == 0 || data != NULL);
RUNTIME_CHECK(isc_once_do(&fnv_once, fnv_initialize) == ISC_R_SUCCESS);
if (ISC_UNLIKELY(!fnv_initialized))
RUNTIME_CHECK(isc_once_do(&fnv_once, fnv_initialize) == ISC_R_SUCCESS);
hval = ISC_UNLIKELY(previous_hashp != NULL) ?
*previous_hashp : fnv_offset_basis;
@@ -530,33 +539,33 @@ isc_hash_function_reverse(const void *data, size_t length,
if (case_sensitive) {
while (be >= bp + 4) {
be -= 4;
hval ^= (isc_uint32_t) be[3];
hval ^= be[3];
hval *= 16777619;
hval ^= (isc_uint32_t) be[2];
hval ^= be[2];
hval *= 16777619;
hval ^= (isc_uint32_t) be[1];
hval ^= be[1];
hval *= 16777619;
hval ^= (isc_uint32_t) be[0];
hval ^= be[0];
hval *= 16777619;
}
while (--be >= bp) {
hval ^= (isc_uint32_t) *be;
hval ^= *be;
hval *= 16777619;
}
} else {
while (be >= bp + 4) {
be -= 4;
hval ^= (isc_uint32_t) maptolower[be[3]];
hval ^= maptolower[be[3]];
hval *= 16777619;
hval ^= (isc_uint32_t) maptolower[be[2]];
hval ^= maptolower[be[2]];
hval *= 16777619;
hval ^= (isc_uint32_t) maptolower[be[1]];
hval ^= maptolower[be[1]];
hval *= 16777619;
hval ^= (isc_uint32_t) maptolower[be[0]];
hval ^= maptolower[be[0]];
hval *= 16777619;
}
while (--be >= bp) {
hval ^= (isc_uint32_t) maptolower[*be];
hval ^= maptolower[*be];
hval *= 16777619;
}
}