Signed-off-by: Alex Wang <al...@nicira.com>
---
lib/automake.mk | 2 +
lib/ovs-numa.c | 208 +++++++++++++++++++++++++++++++++++++++++++++++
lib/ovs-numa.h | 33 ++++++++
tests/ofproto-macros.at | 1 +
vswitchd/bridge.c | 2 +
5 files changed, 246 insertions(+)
create mode 100644 lib/ovs-numa.c
create mode 100644 lib/ovs-numa.h
diff --git a/lib/automake.mk b/lib/automake.mk
index 3f984d9..ca6c890 100644
--- a/lib/automake.mk
+++ b/lib/automake.mk
@@ -150,6 +150,8 @@ lib_libopenvswitch_la_SOURCES = \
lib/ovs-atomic-locked.h \
lib/ovs-atomic-pthreads.h \
lib/ovs-atomic.h \
+ lib/ovs-numa.c \
+ lib/ovs-numa.h \
lib/ovs-rcu.c \
lib/ovs-rcu.h \
lib/ovs-thread.c \
diff --git a/lib/ovs-numa.c b/lib/ovs-numa.c
new file mode 100644
index 0000000..2bcef72
--- /dev/null
+++ b/lib/ovs-numa.c
@@ -0,0 +1,208 @@
+/*
+ * Copyright (c) 2014 Nicira, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <config.h>
+#include "ovs-numa.h"
+
+#include <ctype.h>
+#include <dirent.h>
+#include <sys/types.h>
+
+#include "hash.h"
+#include "hmap.h"
+#include "list.h"
+#include "ovs-thread.h"
+#include "vlog.h"
+
+VLOG_DEFINE_THIS_MODULE(ovs_numa);
+
+#define MAX_CPU_SOCKETS 8
+
+#define SYS_SOCKET_DIR "/sys/devices/system/node/node%d"
+
+/* Cpu socket. */
+struct cpu_socket {
+ struct hmap_node hmap_node; /* In the 'all_cpu_sockets'. */
+ struct list cores; /* List of cpu cores on the socket. */
+ uint32_t socket_id; /* Socket id. */
+};
+
+/* Cpu core on a cpu socket. */
+struct cpu_core {
+ struct hmap_node hmap_node;/* In the 'all_cpu_coress'. */
+ struct list list_node; /* In 'cpu_socket->cores' list. */
+ struct cpu_socket *socket; /* Socket containing the core. */
+ uint32_t core_id; /* Core id. */
+ bool pinned; /* If a thread has been pinned to the core. */
+};
+
+/* Contains all 'struct cpu_socket's. */
+static struct hmap all_cpu_sockets = HMAP_INITIALIZER(&all_cpu_sockets);
+/* Contains all 'struct cpu_core's. */
+static struct hmap all_cpu_cores = HMAP_INITIALIZER(&all_cpu_cores);
+
+/* Returns true if 'str' contains all digits. Returns false otherwise. */
+static bool
+contain_all_digits(const char *str)
+{
+ size_t i = 0;
+
+ while (str[i] != '\0') {
+ if (!isdigit(str[i++])) {
+ return false;
+ }
+ }
+
+ return true;
+}
+
+/* Discovers all cpu sockets and the corresponding cpu cores for each socket.
+ * Constructs the 'struct cpu_socket' and 'struct cpu_core'. */
+static void
+discover_sockets_and_cores(void)
+{
+ int n_cpus = 0;
+ int i;
+
+ for (i = 0; i < MAX_CPU_SOCKETS; i++) {
+ DIR *dir;
+ char path[PATH_MAX];
+ int path_len;
+
+ /* Constructs the path to node /sys/devices/system/nodeX. */
+ path_len = snprintf(path, sizeof(path), SYS_SOCKET_DIR, i);
+
+ if (path_len <= 0 || path_len >= sizeof(path)) {
+ VLOG_WARN("Path to cpu socket %d exceeds the length limit", i);
+ break;
+ }
+
+ dir = opendir(path);
+
+ /* Creates 'struct cpu_socket' if the 'dir' is non-null. */
+ if (dir) {
+ struct cpu_socket *s = xzalloc(sizeof *s);
+ struct dirent *subdir;
+ char *endptr = NULL;
+
+ hmap_insert(&all_cpu_sockets, &s->hmap_node, hash_int(i, 0));
+ list_init(&s->cores);
+ s->socket_id = i;
+
+ while ((subdir = readdir(dir)) != NULL) {
+ if (!strncmp(subdir->d_name, "cpu", 3)
+ && contain_all_digits(subdir->d_name + 3)){
+ struct cpu_core *c = xzalloc(sizeof *c);
+ uint32_t core_id;
+
+ core_id = strtoul(subdir->d_name + 3, &endptr, 10);
+ hmap_insert(&all_cpu_cores, &c->hmap_node,
+ hash_int(core_id, 0));
+ list_insert(&s->cores, &c->list_node);
+ c->core_id = core_id;
+ n_cpus++;
+ }
+ }
+ } else {
+ break;
+ }
+ closedir(dir);
+ }
+
+ VLOG_INFO("Discovered %"PRIu64" CPU Sockets and %d CPU cores",
+ hmap_count(&all_cpu_sockets), n_cpus);
+}
+
+/* Extracts the numa node and core info from the 'sysfs'. */
+void
+ovs_numa_init(void)
+{
+ static struct ovsthread_once once = OVSTHREAD_ONCE_INITIALIZER;
+
+ if (ovsthread_once_start(&once)) {
+ discover_sockets_and_cores();
+ ovsthread_once_done(&once);
+ }
+}
+
+/* Returns the number of cpu sockets. */
+uint32_t
+ovs_numa_get_n_sockets(void)
+{
+ return hmap_count(&all_cpu_sockets);
+}
+
+/* Returns the number of cpu cores. */
+uint32_t
+ovs_numa_get_n_cores(void)
+{
+ return hmap_count(&all_cpu_cores);
+}
+
+/* Searches through all cores for an unpinned core. Returns the core_id
+ * if found and set the 'core->pinned' to true. Otherwise, returns -1. */
+int
+ovs_numa_get_unpinned_core_any(void)
+{
+ struct cpu_core *core;
+
+ HMAP_FOR_EACH(core, hmap_node, &all_cpu_cores) {
+ if (!core->pinned) {
+ core->pinned = true;
+ return core->core_id;
+ }
+ }
+
+ return -1;
+}
+
+/* Searches through all cores on socket with 'socket_id' for an unpinned core.
+ * Returns the core_id if found and sets the 'core->pinned' to true.
+ * Otherwise, returns -1. */
+int
+ovs_numa_get_unpinned_core_on_socket(uint32_t socket_id)
+{
+ struct cpu_socket *socket;
+ struct cpu_core *core;
+
+ CPU_SOCKET_ID_ASSERT(socket_id);
+
+ socket = CONTAINER_OF(hmap_first_with_hash(&all_cpu_sockets,
+ hash_int(socket_id, 0)),
+ struct cpu_socket, hmap_node);
+ LIST_FOR_EACH(core, list_node, &socket->cores) {
+ if (!core->pinned) {
+ core->pinned = true;
+ return core->core_id;
+ }
+ }
+
+ return -1;
+}
+
+/* Resets the 'core->pinned' for the core with 'core_id'. */
+void
+ovs_numa_unpin_core(uint32_t core_id)
+{
+ struct cpu_core *core;
+
+ CPU_CORE_ID_ASSERT(core_id);
+
+ core = CONTAINER_OF(hmap_first_with_hash(&all_cpu_cores,
+ hash_int(core_id, 0)),
+ struct cpu_core, hmap_node);
+ core->pinned = false;
+}
diff --git a/lib/ovs-numa.h b/lib/ovs-numa.h
new file mode 100644
index 0000000..3e31d9e
--- /dev/null
+++ b/lib/ovs-numa.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2014 Nicira, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef OVS_NUMA_H
+#define OVS_NUMA_H 1
+
+#include <stdint.h>
+
+#define CPU_SOCKET_ID_ASSERT(SID) ovs_assert((SID) < ovs_numa_get_n_sockets())
+#define CPU_CORE_ID_ASSERT(CID) ovs_assert((CID) < ovs_numa_get_n_cores())
+
+void ovs_numa_init(void);
+
+uint32_t ovs_numa_get_n_sockets(void);
+uint32_t ovs_numa_get_n_cores(void);
+int ovs_numa_get_unpinned_core_any(void);
+int ovs_numa_get_unpinned_core_on_socket(uint32_t socket_id);
+void ovs_numa_unpin_core(uint32_t core_id);
+
+#endif /* ovs-thread.h */
diff --git a/tests/ofproto-macros.at b/tests/ofproto-macros.at
index 85ecc5c..77b9b39 100644
--- a/tests/ofproto-macros.at
+++ b/tests/ofproto-macros.at
@@ -76,6 +76,7 @@ m4_define([OVS_VSWITCHD_START],
AT_CHECK([ovs-vswitchd --detach --no-chdir --pidfile --enable-dummy$3
--disable-system --log-file -vvconn -vofproto_dpif], [0], [], [stderr])
AT_CAPTURE_FILE([ovs-vswitchd.log])
AT_CHECK([[sed < stderr '
+/ovs_numa|INFO|Discovered /d
/vlog|INFO|opened log file/d
/vswitchd|INFO|ovs-vswitchd (Open vSwitch)/d
/reconnect|INFO|/d
diff --git a/vswitchd/bridge.c b/vswitchd/bridge.c
index 1fa1820..797584b 100644
--- a/vswitchd/bridge.c
+++ b/vswitchd/bridge.c
@@ -41,6 +41,7 @@
#include "ofpbuf.h"
#include "ofproto/bond.h"
#include "ofproto/ofproto.h"
+#include "ovs-numa.h"
#include "poll-loop.h"
#include "seq.h"
#include "sha1.h"
@@ -439,6 +440,7 @@ bridge_init(const char *remote)
lacp_init();
bond_init();
cfm_init();
+ ovs_numa_init();
stp_init();
}
--
1.7.9.5
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