new file mode 100644
--- /dev/null
+++ b/src/http/modules/ngx_http_upstream_zone_module.c
@@ -0,0 +1,213 @@
+
+/*
+ * Copyright (C) Ruslan Ermilov
+ * Copyright (C) Nginx, Inc.
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_http.h>
+
+
+static char *ngx_http_upstream_zone(ngx_conf_t *cf, ngx_command_t *cmd,
+    void *conf);
+static ngx_int_t ngx_http_upstream_init_zone(ngx_shm_zone_t *shm_zone,
+    void *data);
+
+
+static ngx_command_t  ngx_http_upstream_zone_commands[] = {
+
+    { ngx_string("zone"),
+      NGX_HTTP_UPS_CONF|NGX_CONF_TAKE2,
+      ngx_http_upstream_zone,
+      0,
+      0,
+      NULL },
+
+      ngx_null_command
+};
+
+
+static ngx_http_module_t  ngx_http_upstream_zone_module_ctx = {
+    NULL,                                  /* preconfiguration */
+    NULL,                                  /* postconfiguration */
+
+    NULL,                                  /* create main configuration */
+    NULL,                                  /* init main configuration */
+
+    NULL,                                  /* create server configuration */
+    NULL,                                  /* merge server configuration */
+
+    NULL,                                  /* create location configuration */
+    NULL                                   /* merge location configuration */
+};
+
+
+ngx_module_t  ngx_http_upstream_zone_module = {
+    NGX_MODULE_V1,
+    &ngx_http_upstream_zone_module_ctx,    /* module context */
+    ngx_http_upstream_zone_commands,       /* module directives */
+    NGX_HTTP_MODULE,                       /* module type */
+    NULL,                                  /* init master */
+    NULL,                                  /* init module */
+    NULL,                                  /* init process */
+    NULL,                                  /* init thread */
+    NULL,                                  /* exit thread */
+    NULL,                                  /* exit process */
+    NULL,                                  /* exit master */
+    NGX_MODULE_V1_PADDING
+};
+
+
+static char *
+ngx_http_upstream_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
+{
+    ngx_http_upstream_srv_conf_t  *uscf;
+    ssize_t                        size;
+    ngx_str_t                     *value;
+
+    uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module);
+
+    value = cf->args->elts;
+
+    if (!value[1].len) {
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                           "invalid zone name \"%V\"", &value[1]);
+        return NGX_CONF_ERROR;
+    }
+
+    size = ngx_parse_size(&value[2]);
+
+    if (size == NGX_ERROR) {
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                           "invalid zone size \"%V\"", &value[2]);
+        return NGX_CONF_ERROR;
+    }
+
+    if (size < (ssize_t) (8 * ngx_pagesize)) {
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                           "zone \"%V\" is too small", &value[1]);
+        return NGX_CONF_ERROR;
+    }
+
+    uscf->shm_zone = ngx_shared_memory_add(cf, &value[1], size,
+                                           &ngx_http_upstream_module);
+    if (uscf->shm_zone == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    if (uscf->shm_zone->data) {
+        uscf = uscf->shm_zone->data;
+
+        ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
+                           "upstream \"%V\" in %s:%ui "
+                           "is already bound to zone \"%V\"",
+                           &uscf->host, uscf->file_name, uscf->line,
+                           &value[1]);
+        return NGX_CONF_ERROR;
+    }
+
+    uscf->shm_zone->init = ngx_http_upstream_init_zone;
+    uscf->shm_zone->data = uscf;
+
+    uscf->shm_zone->noreuse = 1;
+
+    return NGX_CONF_OK;
+}
+
+
+static ngx_int_t
+ngx_http_upstream_init_zone(ngx_shm_zone_t *shm_zone, void *data)
+{
+    ngx_http_upstream_srv_conf_t  *ouscf = data;
+
+    size_t                          len;
+    ngx_slab_pool_t                *shpool;
+    ngx_http_upstream_rr_peer_t    *peer, **peerp;
+    ngx_http_upstream_rr_peers_t   *peers, *backup;
+    ngx_http_upstream_srv_conf_t   *uscf;
+
+    uscf = shm_zone->data;
+
+    if (ouscf) {
+        ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0,
+                      "zone \"%V\" cannot be reused", &shm_zone->shm.name);
+        return NGX_ERROR;
+    }
+
+    shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
+
+    if (shm_zone->shm.exists) {
+        return NGX_ERROR;
+    }
+
+
+    /* copy peers to shared memory */
+
+    len = sizeof(" in upstream zone \"\"") + shm_zone->shm.name.len;
+
+    shpool->log_ctx = ngx_slab_alloc(shpool, len);
+    if (shpool->log_ctx == NULL) {
+        return NGX_ERROR;
+    }
+
+    ngx_sprintf(shpool->log_ctx, " in upstream zone \"%V\"%Z",
+                &shm_zone->shm.name);
+
+    peers = ngx_slab_alloc(shpool, sizeof(ngx_http_upstream_rr_peers_t));
+    if (peers == NULL) {
+        return NGX_ERROR;
+    }
+
+    ngx_memcpy(peers, uscf->peer.data, sizeof(ngx_http_upstream_rr_peers_t));
+
+    peers->shpool = shpool;
+
+    for (peerp = &peers->peer; *peerp; peerp = &peer->next) {
+        /* pool is unlocked */
+        peer = ngx_slab_calloc_locked(shpool,
+                                      sizeof(ngx_http_upstream_rr_peer_t));
+        if (peer == NULL) {
+            return NGX_ERROR;
+        }
+
+        ngx_memcpy(peer, *peerp, sizeof(ngx_http_upstream_rr_peer_t));
+
+        *peerp = peer;
+    }
+
+    if (peers->next == NULL) {
+        goto done;
+    }
+
+    backup = ngx_slab_alloc(shpool, sizeof(ngx_http_upstream_rr_peers_t));
+    if (backup == NULL) {
+        return NGX_ERROR;
+    }
+
+    ngx_memcpy(backup, peers->next, sizeof(ngx_http_upstream_rr_peers_t));
+
+    backup->shpool = shpool;
+
+    for (peerp = &backup->peer; *peerp; peerp = &peer->next) {
+        /* pool is unlocked */
+        peer = ngx_slab_calloc_locked(shpool,
+                                      sizeof(ngx_http_upstream_rr_peer_t));
+        if (peer == NULL) {
+            return NGX_ERROR;
+        }
+
+        ngx_memcpy(peer, *peerp, sizeof(ngx_http_upstream_rr_peer_t));
+
+        *peerp = peer;
+    }
+
+    peers->next = backup;
+
+done:
+
+    uscf->peer.data = peers;
+
+    return NGX_OK;
+}