X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=servers%2Fslapd%2Fzn_malloc.c;h=7f8694763fb94b9130787712341ad46ba5cd9aa5;hb=4317c7ce54ceb41d57e6ec83f547edfaeedb574b;hp=e276583a851224871938e30556de231548af381d;hpb=670e4180644616d922a496cf86000916443adfbc;p=openldap
diff --git a/servers/slapd/zn_malloc.c b/servers/slapd/zn_malloc.c
index e276583a85..7f8694763f 100644
--- a/servers/slapd/zn_malloc.c
+++ b/servers/slapd/zn_malloc.c
@@ -2,7 +2,7 @@
/* $OpenLDAP$*/
/* This work is part of OpenLDAP Software .
*
- * Copyright 2003-2004 The OpenLDAP Foundation.
+ * Copyright 2003-2012 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -13,15 +13,15 @@
* top-level directory of the distribution or, alternatively, at
* .
*/
-/* Copyright 2004 IBM Corporation
+/* Portions Copyright 2004 IBM Corporation
* All rights reserved.
- * Redisribution and use in source and binary forms, with or without
- * modification, are permitted only as authorizd by the OpenLADP
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
* Public License.
*/
/* ACKNOWLEDGEMENTS
- * This work originally developed by Jong-Hyuk Choi
- * 2004/12/09 jongchoi@OpenLDAP.org
+ * This work originally developed by Jong-Hyuk Choi for inclusion in
+ * OpenLDAP Software.
*/
#include "portable.h"
@@ -29,13 +29,14 @@
#include
#include
#include
-#include
#include
#include "slap.h"
#ifdef SLAP_ZONE_ALLOC
+#include
+
static int slap_zone_cmp(const void *v1, const void *v2);
void * slap_replenish_zopool(void *ctx);
@@ -62,26 +63,29 @@ slap_zn_mem_destroy(
} while (pad_shift >>= 1);
ldap_pvt_thread_mutex_lock( &zh->zh_mutex );
- for (i = 0; i <= zh->zh_zoneorder - order_start; i++) {
+ for (i = 0; i < zh->zh_zoneorder - order_start + 1; i++) {
zo = LDAP_LIST_FIRST(&zh->zh_free[i]);
while (zo) {
struct zone_object *zo_tmp = zo;
zo = LDAP_LIST_NEXT(zo, zo_link);
+ LDAP_LIST_REMOVE(zo_tmp, zo_link);
LDAP_LIST_INSERT_HEAD(&zh->zh_zopool, zo_tmp, zo_link);
}
}
ch_free(zh->zh_free);
for (i = 0; i < zh->zh_numzones; i++) {
- for (j = 0; j < zh->zh_zoneorder - order_start; j++) {
+ for (j = 0; j < zh->zh_zoneorder - order_start + 1; j++) {
ch_free(zh->zh_maps[i][j]);
}
ch_free(zh->zh_maps[i]);
munmap(zh->zh_zones[i], zh->zh_zonesize);
+ ldap_pvt_thread_rdwr_destroy(&zh->zh_znlock[i]);
}
ch_free(zh->zh_maps);
ch_free(zh->zh_zones);
ch_free(zh->zh_seqno);
+ ch_free(zh->zh_znlock);
avl_free(zh->zh_zonetree, slap_zo_release);
@@ -99,8 +103,9 @@ slap_zn_mem_destroy(
zo = LDAP_LIST_NEXT(zo, zo_link);
ch_free(zo_tmp);
}
- ldap_pvt_thread_mutex_unlock( &zh->zh_mutex );
- ldap_pvt_thread_mutex_destroy( &zh->zh_mutex );
+ ldap_pvt_thread_mutex_unlock(&zh->zh_mutex);
+ ldap_pvt_thread_rdwr_destroy(&zh->zh_lock);
+ ldap_pvt_thread_mutex_destroy(&zh->zh_mutex);
ch_free(zh);
}
@@ -120,6 +125,13 @@ slap_zn_mem_create(
int i, j;
struct zone_object *zo;
+ Debug(LDAP_DEBUG_NONE,
+ "--> slap_zn_mem_create: initsize=%d, maxsize=%d\n",
+ initsize, maxsize, 0);
+ Debug(LDAP_DEBUG_NONE,
+ "++> slap_zn_mem_create: deltasize=%d, zonesize=%d\n",
+ deltasize, zonesize, 0);
+
zh = (struct zone_heap *)ch_calloc(1, sizeof(struct zone_heap));
zh->zh_fd = open("/dev/zero", O_RDWR);
@@ -158,6 +170,8 @@ slap_zn_mem_create(
order = order_end - order_start + 1;
zh->zh_zones = (void **)ch_malloc(zh->zh_maxzones * sizeof(void*));
+ zh->zh_znlock = (ldap_pvt_thread_rdwr_t *)ch_malloc(
+ zh->zh_maxzones * sizeof(ldap_pvt_thread_rdwr_t *));
zh->zh_maps = (unsigned char ***)ch_malloc(
zh->zh_maxzones * sizeof(unsigned char**));
@@ -180,7 +194,7 @@ slap_zn_mem_create(
int shiftamt = order_start + 1 + j;
int nummaps = zh->zh_zonesize >> shiftamt;
assert(nummaps);
- nummaps /= 8;
+ nummaps >>= 3;
if (!nummaps) nummaps = 1;
zh->zh_maps[i][j] = (unsigned char *)ch_malloc(nummaps);
memset(zh->zh_maps[i][j], 0, nummaps);
@@ -200,12 +214,16 @@ slap_zn_mem_create(
}
zo = LDAP_LIST_FIRST(&zh->zh_zopool);
LDAP_LIST_REMOVE(zo, zo_link);
- zo->zo_ptr = (void*)((unsigned long)zh->zh_zones[i]>>zh->zh_zoneorder);
+ zo->zo_ptr = zh->zh_zones[i];
+ zo->zo_siz = zh->zh_zonesize;
zo->zo_idx = i;
avl_insert(&zh->zh_zonetree, zo, slap_zone_cmp, avl_dup_error);
+ ldap_pvt_thread_rdwr_init(&zh->zh_znlock[i]);
}
+ LDAP_STAILQ_INIT(&zh->zh_latency_history_queue);
ldap_pvt_thread_mutex_init(&zh->zh_mutex);
+ ldap_pvt_thread_rdwr_init(&zh->zh_lock);
return zh;
}
@@ -226,6 +244,9 @@ slap_zn_malloc(
unsigned long diff;
int i, j, k;
+ Debug(LDAP_DEBUG_NONE,
+ "--> slap_zn_malloc: size=%d\n", size, 0, 0);
+
if (!zh) return ber_memalloc_x(size, NULL);
/* round up to doubleword boundary */
@@ -262,6 +283,8 @@ retry:
zo_new->zo_idx = -1;
LDAP_LIST_INSERT_HEAD(&zh->zh_zopool, zo_new, zo_link);
ldap_pvt_thread_mutex_unlock( &zh->zh_mutex );
+ Debug(LDAP_DEBUG_NONE, "slap_zn_malloc: returning 0x%x, 0x%x\n",
+ ptr, (int)ptr>>(zh->zh_zoneorder+1), 0);
return((void*)ptr);
} else if (i <= zh->zh_zoneorder) {
for (j = i; j > order; j--) {
@@ -274,6 +297,9 @@ retry:
LDAP_LIST_REMOVE(zo_right, zo_link);
zo_right->zo_ptr = zo_left->zo_ptr + (1 << j);
zo_right->zo_idx = zo_left->zo_idx;
+ Debug(LDAP_DEBUG_NONE,
+ "slap_zn_malloc: split (left=0x%x, right=0x%x)\n",
+ zo_left->zo_ptr, zo_right->zo_ptr, 0);
if (j == order + 1) {
ptr = zo_left->zo_ptr;
diff = (unsigned long)((char*)ptr -
@@ -286,6 +312,9 @@ retry:
&zh->zh_free[j-1-order_start], zo_right, zo_link);
LDAP_LIST_INSERT_HEAD(&zh->zh_zopool, zo_left, zo_link);
ldap_pvt_thread_mutex_unlock( &zh->zh_mutex );
+ Debug(LDAP_DEBUG_NONE,
+ "slap_zn_malloc: returning 0x%x, 0x%x\n",
+ ptr, (int)ptr>>(zh->zh_zoneorder+1), 0);
return((void*)ptr);
} else {
LDAP_LIST_INSERT_HEAD(
@@ -300,8 +329,11 @@ retry:
if ( zh->zh_maxzones < zh->zh_numzones + zh->zh_deltazones ) {
ldap_pvt_thread_mutex_unlock( &zh->zh_mutex );
Debug( LDAP_DEBUG_TRACE,
- "slap_zn_malloc of %lu bytes failed, using ch_malloc\n",
+ "zn_malloc %lu: ch_malloc\n",
(long)size, 0, 0);
+ Debug(LDAP_DEBUG_NONE,
+ "slap_zn_malloc: returning 0x%x, 0x%x\n",
+ ptr, (int)ptr>>(zh->zh_zoneorder+1), 0);
return (void*)ch_malloc(size);
}
@@ -309,13 +341,13 @@ retry:
zh->zh_zones[i] = mmap(0, zh->zh_zonesize, PROT_READ | PROT_WRITE,
MAP_PRIVATE, zh->zh_fd, 0);
zh->zh_maps[i] = (unsigned char **)
- ch_malloc((zh->zh_zoneorder - order_start +1) *
+ ch_malloc((zh->zh_zoneorder - order_start + 1) *
sizeof(unsigned char *));
- for (j = 0; j < order; j++) {
+ for (j = 0; j < zh->zh_zoneorder-order_start+1; j++) {
int shiftamt = order_start + 1 + j;
int nummaps = zh->zh_zonesize >> shiftamt;
assert(nummaps);
- nummaps /= 8;
+ nummaps >>= 3;
if (!nummaps) nummaps = 1;
zh->zh_maps[i][j] = (unsigned char *)ch_malloc(nummaps);
memset(zh->zh_maps[i][j], 0, nummaps);
@@ -336,10 +368,11 @@ retry:
}
zo = LDAP_LIST_FIRST(&zh->zh_zopool);
LDAP_LIST_REMOVE(zo, zo_link);
- zo->zo_ptr = (void*)((unsigned long)zh->zh_zones[i]>>
- zh->zh_zoneorder);
+ zo->zo_ptr = zh->zh_zones[i];
+ zo->zo_siz = zh->zh_zonesize;
zo->zo_idx = i;
avl_insert(&zh->zh_zonetree, zo, slap_zone_cmp, avl_dup_error);
+ ldap_pvt_thread_rdwr_init(&zh->zh_znlock[i]);
}
zh->zh_numzones += zh->zh_deltazones;
ldap_pvt_thread_mutex_unlock( &zh->zh_mutex );
@@ -372,10 +405,13 @@ slap_zn_realloc(void *ptr, ber_len_t size, void *ctx)
void *newptr = NULL;
struct zone_heap *zone = NULL;
+ Debug(LDAP_DEBUG_NONE,
+ "--> slap_zn_realloc: ptr=0x%x, size=%d\n", ptr, size, 0);
+
if (ptr == NULL)
return slap_zn_malloc(size, zh);
- zoi.zo_ptr = (void*)((unsigned long)p >> zh->zh_zoneorder);
+ zoi.zo_ptr = p;
zoi.zo_idx = -1;
if (zh) {
@@ -429,9 +465,11 @@ slap_zn_free(void *ptr, void *ctx)
int i, k, inserted = 0, idx;
struct zone_heap *zone = NULL;
- zoi.zo_ptr = (void*)((unsigned long)p >> zh->zh_zoneorder);
+ zoi.zo_ptr = p;
zoi.zo_idx = -1;
+ Debug(LDAP_DEBUG_NONE, "--> slap_zn_free: ptr=0x%x\n", ptr, 0, 0);
+
if (zh) {
ldap_pvt_thread_mutex_lock( &zh->zh_mutex );
zoo = avl_find(zh->zh_zonetree, &zoi, slap_zone_cmp);
@@ -479,6 +517,9 @@ slap_zn_free(void *ptr, void *ctx)
if (i < zh->zh_zoneorder) {
inserted = 1;
zo->zo_ptr = tmpp;
+ Debug(LDAP_DEBUG_NONE,
+ "slap_zn_free: merging 0x%x\n",
+ zo->zo_ptr, 0, 0);
LDAP_LIST_INSERT_HEAD(&zh->zh_free[i-order_start+1],
zo, zo_link);
}
@@ -490,6 +531,10 @@ slap_zn_free(void *ptr, void *ctx)
zo = LDAP_LIST_FIRST(&zh->zh_zopool);
LDAP_LIST_REMOVE(zo, zo_link);
zo->zo_ptr = tmpp;
+ zo->zo_idx = idx;
+ Debug(LDAP_DEBUG_NONE,
+ "slap_zn_free: merging 0x%x\n",
+ zo->zo_ptr, 0, 0);
LDAP_LIST_INSERT_HEAD(&zh->zh_free[i-order_start],
zo, zo_link);
break;
@@ -497,7 +542,7 @@ slap_zn_free(void *ptr, void *ctx)
Debug(LDAP_DEBUG_ANY, "slap_zn_free: "
"free object not found while bit is clear.\n",
0, 0, 0);
- assert(zo);
+ assert(zo != NULL);
}
} else {
@@ -508,6 +553,10 @@ slap_zn_free(void *ptr, void *ctx)
zo = LDAP_LIST_FIRST(&zh->zh_zopool);
LDAP_LIST_REMOVE(zo, zo_link);
zo->zo_ptr = tmpp;
+ zo->zo_idx = idx;
+ Debug(LDAP_DEBUG_NONE,
+ "slap_zn_free: merging 0x%x\n",
+ zo->zo_ptr, 0, 0);
LDAP_LIST_INSERT_HEAD(&zh->zh_free[i-order_start],
zo, zo_link);
}
@@ -530,6 +579,9 @@ slap_zn_free(void *ptr, void *ctx)
if (zo) {
if (i < zh->zh_zoneorder) {
inserted = 1;
+ Debug(LDAP_DEBUG_NONE,
+ "slap_zn_free: merging 0x%x\n",
+ zo->zo_ptr, 0, 0);
LDAP_LIST_INSERT_HEAD(&zh->zh_free[i-order_start+1],
zo, zo_link);
continue;
@@ -541,6 +593,10 @@ slap_zn_free(void *ptr, void *ctx)
zo = LDAP_LIST_FIRST(&zh->zh_zopool);
LDAP_LIST_REMOVE(zo, zo_link);
zo->zo_ptr = tmpp;
+ zo->zo_idx = idx;
+ Debug(LDAP_DEBUG_NONE,
+ "slap_zn_free: merging 0x%x\n",
+ zo->zo_ptr, 0, 0);
LDAP_LIST_INSERT_HEAD(&zh->zh_free[i-order_start],
zo, zo_link);
break;
@@ -548,7 +604,7 @@ slap_zn_free(void *ptr, void *ctx)
Debug(LDAP_DEBUG_ANY, "slap_zn_free: "
"free object not found while bit is clear.\n",
0, 0, 0 );
- assert( zo );
+ assert(zo != NULL);
}
} else {
@@ -559,6 +615,10 @@ slap_zn_free(void *ptr, void *ctx)
zo = LDAP_LIST_FIRST(&zh->zh_zopool);
LDAP_LIST_REMOVE(zo, zo_link);
zo->zo_ptr = tmpp;
+ zo->zo_idx = idx;
+ Debug(LDAP_DEBUG_NONE,
+ "slap_zn_free: merging 0x%x\n",
+ zo->zo_ptr, 0, 0);
LDAP_LIST_INSERT_HEAD(&zh->zh_free[i-order_start],
zo, zo_link);
}
@@ -575,8 +635,15 @@ slap_zone_cmp(const void *v1, const void *v2)
{
const struct zone_object *zo1 = v1;
const struct zone_object *zo2 = v2;
+ char *ptr1;
+ char *ptr2;
+ ber_len_t zpad;
- return zo1->zo_ptr - zo2->zo_ptr;
+ zpad = zo2->zo_siz - 1;
+ ptr1 = (char*)(((unsigned long)zo1->zo_ptr + zpad) & ~zpad);
+ ptr2 = (char*)zo2->zo_ptr + ((char*)ptr1 - (char*)zo1->zo_ptr);
+ ptr2 = (char*)(((unsigned long)ptr2 + zpad) & ~zpad);
+ return (int)((char*)ptr1 - (char*)ptr2);
}
void *
@@ -604,4 +671,302 @@ slap_replenish_zopool(
return zo_block;
}
+
+int
+slap_zn_invalidate(
+ void *ctx,
+ void *ptr
+)
+{
+ struct zone_heap* zh = ctx;
+ struct zone_object zoi, *zoo;
+ struct zone_heap *zone = NULL;
+ int seqno = *((ber_len_t*)ptr - 2);
+ int idx = -1, rc = 0;
+ int pad = 2*sizeof(int)-1, pad_shift;
+ int order_start = -1, i;
+ struct zone_object *zo;
+
+ pad_shift = pad - 1;
+ do {
+ order_start++;
+ } while (pad_shift >>= 1);
+
+ zoi.zo_ptr = ptr;
+ zoi.zo_idx = -1;
+
+ ldap_pvt_thread_mutex_lock( &zh->zh_mutex );
+ zoo = avl_find(zh->zh_zonetree, &zoi, slap_zone_cmp);
+
+ if (zoo) {
+ idx = zoo->zo_idx;
+ assert(idx != -1);
+ madvise(zh->zh_zones[idx], zh->zh_zonesize, MADV_DONTNEED);
+ for (i = 0; i < zh->zh_zoneorder - order_start + 1; i++) {
+ int shiftamt = order_start + 1 + i;
+ int nummaps = zh->zh_zonesize >> shiftamt;
+ assert(nummaps);
+ nummaps >>= 3;
+ if (!nummaps) nummaps = 1;
+ memset(zh->zh_maps[idx][i], 0, nummaps);
+ zo = LDAP_LIST_FIRST(&zh->zh_free[i]);
+ while (zo) {
+ struct zone_object *zo_tmp = zo;
+ zo = LDAP_LIST_NEXT(zo, zo_link);
+ if (zo_tmp && zo_tmp->zo_idx == idx) {
+ LDAP_LIST_REMOVE(zo_tmp, zo_link);
+ LDAP_LIST_INSERT_HEAD(&zh->zh_zopool, zo_tmp, zo_link);
+ }
+ }
+ }
+ if (LDAP_LIST_EMPTY(&zh->zh_zopool)) {
+ slap_replenish_zopool(zh);
+ }
+ zo = LDAP_LIST_FIRST(&zh->zh_zopool);
+ LDAP_LIST_REMOVE(zo, zo_link);
+ zo->zo_ptr = zh->zh_zones[idx];
+ zo->zo_idx = idx;
+ LDAP_LIST_INSERT_HEAD(&zh->zh_free[zh->zh_zoneorder-order_start],
+ zo, zo_link);
+ zh->zh_seqno[idx]++;
+ } else {
+ Debug(LDAP_DEBUG_NONE, "zone not found for (ctx=0x%x, ptr=0x%x) !\n",
+ ctx, ptr, 0);
+ }
+
+ ldap_pvt_thread_mutex_unlock( &zh->zh_mutex );
+ Debug(LDAP_DEBUG_NONE, "zone %d invalidate\n", idx, 0, 0);
+ return rc;
+}
+
+int
+slap_zn_validate(
+ void *ctx,
+ void *ptr,
+ int seqno
+)
+{
+ struct zone_heap* zh = ctx;
+ struct zone_object zoi, *zoo;
+ struct zone_heap *zone = NULL;
+ int idx, rc = 0;
+
+ zoi.zo_ptr = ptr;
+ zoi.zo_idx = -1;
+
+ zoo = avl_find(zh->zh_zonetree, &zoi, slap_zone_cmp);
+
+ if (zoo) {
+ idx = zoo->zo_idx;
+ assert(idx != -1);
+ assert(seqno <= zh->zh_seqno[idx]);
+ rc = (seqno == zh->zh_seqno[idx]);
+ }
+
+ return rc;
+}
+
+int slap_zh_rlock(
+ void *ctx
+)
+{
+ struct zone_heap* zh = ctx;
+ ldap_pvt_thread_rdwr_rlock(&zh->zh_lock);
+}
+
+int slap_zh_runlock(
+ void *ctx
+)
+{
+ struct zone_heap* zh = ctx;
+ ldap_pvt_thread_rdwr_runlock(&zh->zh_lock);
+}
+
+int slap_zh_wlock(
+ void *ctx
+)
+{
+ struct zone_heap* zh = ctx;
+ ldap_pvt_thread_rdwr_wlock(&zh->zh_lock);
+}
+
+int slap_zh_wunlock(
+ void *ctx
+)
+{
+ struct zone_heap* zh = ctx;
+ ldap_pvt_thread_rdwr_wunlock(&zh->zh_lock);
+}
+
+int slap_zn_rlock(
+ void *ctx,
+ void *ptr
+)
+{
+ struct zone_heap* zh = ctx;
+ struct zone_object zoi, *zoo;
+ struct zone_heap *zone = NULL;
+ int idx;
+
+ zoi.zo_ptr = ptr;
+ zoi.zo_idx = -1;
+
+ ldap_pvt_thread_mutex_lock( &zh->zh_mutex );
+ zoo = avl_find(zh->zh_zonetree, &zoi, slap_zone_cmp);
+ ldap_pvt_thread_mutex_unlock( &zh->zh_mutex );
+
+ if (zoo) {
+ idx = zoo->zo_idx;
+ assert(idx != -1);
+ ldap_pvt_thread_rdwr_rlock(&zh->zh_znlock[idx]);
+ }
+}
+
+int slap_zn_runlock(
+ void *ctx,
+ void *ptr
+)
+{
+ struct zone_heap* zh = ctx;
+ struct zone_object zoi, *zoo;
+ struct zone_heap *zone = NULL;
+ int idx;
+
+ zoi.zo_ptr = ptr;
+ zoi.zo_idx = -1;
+
+ ldap_pvt_thread_mutex_lock( &zh->zh_mutex );
+ zoo = avl_find(zh->zh_zonetree, &zoi, slap_zone_cmp);
+ ldap_pvt_thread_mutex_unlock( &zh->zh_mutex );
+
+ if (zoo) {
+ idx = zoo->zo_idx;
+ assert(idx != -1);
+ ldap_pvt_thread_rdwr_runlock(&zh->zh_znlock[idx]);
+ }
+}
+
+int slap_zn_wlock(
+ void *ctx,
+ void *ptr
+)
+{
+ struct zone_heap* zh = ctx;
+ struct zone_object zoi, *zoo;
+ struct zone_heap *zone = NULL;
+ int idx;
+
+ zoi.zo_ptr = ptr;
+ zoi.zo_idx = -1;
+
+ ldap_pvt_thread_mutex_lock( &zh->zh_mutex );
+ zoo = avl_find(zh->zh_zonetree, &zoi, slap_zone_cmp);
+ ldap_pvt_thread_mutex_unlock( &zh->zh_mutex );
+
+ if (zoo) {
+ idx = zoo->zo_idx;
+ assert(idx != -1);
+ ldap_pvt_thread_rdwr_wlock(&zh->zh_znlock[idx]);
+ }
+}
+
+int slap_zn_wunlock(
+ void *ctx,
+ void *ptr
+)
+{
+ struct zone_heap* zh = ctx;
+ struct zone_object zoi, *zoo;
+ struct zone_heap *zone = NULL;
+ int idx;
+
+ zoi.zo_ptr = ptr;
+ zoi.zo_idx = -1;
+
+ ldap_pvt_thread_mutex_lock( &zh->zh_mutex );
+ zoo = avl_find(zh->zh_zonetree, &zoi, slap_zone_cmp);
+ ldap_pvt_thread_mutex_unlock( &zh->zh_mutex );
+
+ if (zoo) {
+ idx = zoo->zo_idx;
+ assert(idx != -1);
+ ldap_pvt_thread_rdwr_wunlock(&zh->zh_znlock[idx]);
+ }
+}
+
+#define T_SEC_IN_USEC 1000000
+
+static int
+slap_timediff(struct timeval *tv_begin, struct timeval *tv_end)
+{
+ uint64_t t_begin, t_end, t_diff;
+
+ t_begin = T_SEC_IN_USEC * tv_begin->tv_sec + tv_begin->tv_usec;
+ t_end = T_SEC_IN_USEC * tv_end->tv_sec + tv_end->tv_usec;
+ t_diff = t_end - t_begin;
+
+ if ( t_diff < 0 )
+ t_diff = 0;
+
+ return (int)t_diff;
+}
+
+void
+slap_set_timing(struct timeval *tv_set)
+{
+ gettimeofday(tv_set, (struct timezone *)NULL);
+}
+
+int
+slap_measure_timing(struct timeval *tv_set, struct timeval *tv_measure)
+{
+ gettimeofday(tv_measure, (struct timezone *)NULL);
+ return(slap_timediff(tv_set, tv_measure));
+}
+
+#define EMA_WEIGHT 0.999000
+#define SLAP_ZN_LATENCY_HISTORY_QLEN 500
+int
+slap_zn_latency_history(void* ctx, int ea_latency)
+{
+/* TODO: monitor /proc/stat (swap) as well */
+ struct zone_heap* zh = ctx;
+ double t_diff = 0.0;
+
+ zh->zh_ema_latency = (double)ea_latency * (1.0 - EMA_WEIGHT)
+ + zh->zh_ema_latency * EMA_WEIGHT;
+ if (!zh->zh_swapping && zh->zh_ema_samples++ % 100 == 99) {
+ struct zone_latency_history *zlh_entry;
+ zlh_entry = ch_calloc(1, sizeof(struct zone_latency_history));
+ zlh_entry->zlh_latency = zh->zh_ema_latency;
+ LDAP_STAILQ_INSERT_TAIL(
+ &zh->zh_latency_history_queue, zlh_entry, zlh_next);
+ zh->zh_latency_history_qlen++;
+ while (zh->zh_latency_history_qlen > SLAP_ZN_LATENCY_HISTORY_QLEN) {
+ struct zone_latency_history *zlh;
+ zlh = LDAP_STAILQ_FIRST(&zh->zh_latency_history_queue);
+ LDAP_STAILQ_REMOVE_HEAD(
+ &zh->zh_latency_history_queue, zlh_next);
+ zh->zh_latency_history_qlen--;
+ ch_free(zlh);
+ }
+ if (zh->zh_latency_history_qlen == SLAP_ZN_LATENCY_HISTORY_QLEN) {
+ struct zone_latency_history *zlh_first, *zlh_last;
+ zlh_first = LDAP_STAILQ_FIRST(&zh->zh_latency_history_queue);
+ zlh_last = LDAP_STAILQ_LAST(&zh->zh_latency_history_queue,
+ zone_latency_history, zlh_next);
+ t_diff = zlh_last->zlh_latency - zlh_first->zlh_latency;
+ }
+ if (t_diff >= 2000) {
+ zh->zh_latency_jump++;
+ } else {
+ zh->zh_latency_jump = 0;
+ }
+ if (zh->zh_latency_jump > 3) {
+ zh->zh_latency_jump = 0;
+ zh->zh_swapping = 1;
+ }
+ }
+ return zh->zh_swapping;
+}
#endif /* SLAP_ZONE_ALLOC */