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From: Tyler Retzlaff <roretzla@linux.microsoft.com>
To: dev@dpdk.org
Cc: thomas@monjalon.net, dmitry.kozliuk@gmail.com, anatoly.burakov@intel.com,
Tyler Retzlaff <roretzla@linux.microsoft.com>,
Narcisa Vasile <navasile@microsoft.com>
Subject: [PATCH 2/3] eal: implement functions for get/set thread affinity
Date: Fri, 1 Apr 2022 06:29:52 -0700
Message-Id: <1648819793-18948-3-git-send-email-roretzla@linux.microsoft.com>
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Implement functions for getting/setting thread affinity.
Threads can be pinned to specific cores by setting their
affinity attribute.
Signed-off-by: Narcisa Vasile <navasile@microsoft.com>
Signed-off-by: Tyler Retzlaff <roretzla@linux.microsoft.com>
---
lib/eal/include/rte_thread.h | 45 ++++++++++
lib/eal/unix/rte_thread.c | 16 ++++
lib/eal/version.map | 4 +
lib/eal/windows/eal_lcore.c | 173 +++++++++++++++++++++++++++++----------
lib/eal/windows/eal_windows.h | 10 +++
lib/eal/windows/include/rte_os.h | 2 +
lib/eal/windows/rte_thread.c | 131 ++++++++++++++++++++++++++++-
7 files changed, 336 insertions(+), 45 deletions(-)
diff --git a/lib/eal/include/rte_thread.h b/lib/eal/include/rte_thread.h
index 8be8ed8..4eb113f 100644
--- a/lib/eal/include/rte_thread.h
+++ b/lib/eal/include/rte_thread.h
@@ -2,6 +2,8 @@
* Copyright(c) 2021 Mellanox Technologies, Ltd
*/
+#include <stdint.h>
+
#include <rte_os.h>
#include <rte_compat.h>
@@ -21,6 +23,13 @@
#endif
/**
+ * Thread id descriptor.
+ */
+typedef struct rte_thread_tag {
+ uintptr_t opaque_id; /**< thread identifier */
+} rte_thread_t;
+
+/**
* TLS key type, an opaque pointer.
*/
typedef struct eal_tls_key *rte_thread_key;
@@ -28,6 +37,42 @@
#ifdef RTE_HAS_CPUSET
/**
+ * Set the affinity of thread 'thread_id' to the cpu set
+ * specified by 'cpuset'.
+ *
+ * @param thread_id
+ * Id of the thread for which to set the affinity.
+ *
+ * @param cpuset
+ * Pointer to CPU affinity to set.
+ *
+ * @return
+ * On success, return 0.
+ * On failure, return a positive errno-style error number.
+ */
+__rte_experimental
+int rte_thread_set_affinity_by_id(rte_thread_t thread_id,
+ const rte_cpuset_t *cpuset);
+
+/**
+ * Get the affinity of thread 'thread_id' and store it
+ * in 'cpuset'.
+ *
+ * @param thread_id
+ * Id of the thread for which to get the affinity.
+ *
+ * @param cpuset
+ * Pointer for storing the affinity value.
+ *
+ * @return
+ * On success, return 0.
+ * On failure, return a positive errno-style error number.
+ */
+__rte_experimental
+int rte_thread_get_affinity_by_id(rte_thread_t thread_id,
+ rte_cpuset_t *cpuset);
+
+/**
* Set core affinity of the current thread.
* Support both EAL and non-EAL thread and update TLS.
*
diff --git a/lib/eal/unix/rte_thread.c b/lib/eal/unix/rte_thread.c
index c34ede9..3bb721d 100644
--- a/lib/eal/unix/rte_thread.c
+++ b/lib/eal/unix/rte_thread.c
@@ -89,3 +89,19 @@ struct eal_tls_key {
}
return pthread_getspecific(key->thread_index);
}
+
+int
+rte_thread_set_affinity_by_id(rte_thread_t thread_id,
+ const rte_cpuset_t *cpuset)
+{
+ return pthread_setaffinity_np((pthread_t)thread_id.opaque_id,
+ sizeof(*cpuset), cpuset);
+}
+
+int
+rte_thread_get_affinity_by_id(rte_thread_t thread_id,
+ rte_cpuset_t *cpuset)
+{
+ return pthread_getaffinity_np((pthread_t)thread_id.opaque_id,
+ sizeof(*cpuset), cpuset);
+}
diff --git a/lib/eal/version.map b/lib/eal/version.map
index b53eeb3..c8d5177 100644
--- a/lib/eal/version.map
+++ b/lib/eal/version.map
@@ -420,6 +420,10 @@ EXPERIMENTAL {
rte_intr_instance_free;
rte_intr_type_get;
rte_intr_type_set;
+
+ # added in 22.07
+ rte_thread_get_affinity_by_id;
+ rte_thread_set_affinity_by_id;
};
INTERNAL {
diff --git a/lib/eal/windows/eal_lcore.c b/lib/eal/windows/eal_lcore.c
index 476c2d2..4ef5920 100644
--- a/lib/eal/windows/eal_lcore.c
+++ b/lib/eal/windows/eal_lcore.c
@@ -2,7 +2,6 @@
* Copyright(c) 2019 Intel Corporation
*/
-#include <pthread.h>
#include <stdbool.h>
#include <stdint.h>
@@ -27,13 +26,15 @@ struct socket_map {
};
struct cpu_map {
- unsigned int socket_count;
unsigned int lcore_count;
+ unsigned int socket_count;
+ unsigned int cpu_count;
struct lcore_map lcores[RTE_MAX_LCORE];
struct socket_map sockets[RTE_MAX_NUMA_NODES];
+ GROUP_AFFINITY cpus[CPU_SETSIZE];
};
-static struct cpu_map cpu_map = { 0 };
+static struct cpu_map cpu_map;
/* eal_create_cpu_map() is called before logging is initialized */
static void
@@ -47,13 +48,116 @@ struct cpu_map {
va_end(va);
}
+static int
+eal_query_group_affinity(void)
+{
+ SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *infos = NULL;
+ unsigned int *cpu_count = &cpu_map.cpu_count;
+ DWORD infos_size = 0;
+ int ret = 0;
+ USHORT group_count;
+ KAFFINITY affinity;
+ USHORT group_no;
+ unsigned int i;
+
+ if (!GetLogicalProcessorInformationEx(RelationGroup, NULL,
+ &infos_size)) {
+ DWORD error = GetLastError();
+ if (error != ERROR_INSUFFICIENT_BUFFER) {
+ log_early("Cannot get group information size, "
+ "error %lu\n", error);
+ rte_errno = EINVAL;
+ ret = -1;
+ goto cleanup;
+ }
+ }
+
+ infos = malloc(infos_size);
+ if (infos == NULL) {
+ log_early("Cannot allocate memory for NUMA node information\n");
+ rte_errno = ENOMEM;
+ ret = -1;
+ goto cleanup;
+ }
+
+ if (!GetLogicalProcessorInformationEx(RelationGroup, infos,
+ &infos_size)) {
+ log_early("Cannot get group information, error %lu\n",
+ GetLastError());
+ rte_errno = EINVAL;
+ ret = -1;
+ goto cleanup;
+ }
+
+ *cpu_count = 0;
+ group_count = infos->Group.ActiveGroupCount;
+ for (group_no = 0; group_no < group_count; group_no++) {
+ affinity = infos->Group.GroupInfo[group_no].ActiveProcessorMask;
+ for (i = 0; i < EAL_PROCESSOR_GROUP_SIZE; i++) {
+ if ((affinity & ((KAFFINITY)1 << i)) == 0)
+ continue;
+ cpu_map.cpus[*cpu_count].Group = group_no;
+ cpu_map.cpus[*cpu_count].Mask = (KAFFINITY)1 << i;
+ (*cpu_count)++;
+ }
+ }
+
+cleanup:
+ free(infos);
+ return ret;
+}
+
+static bool
+eal_create_lcore_map(const SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *info)
+{
+ const unsigned int node_id = info->NumaNode.NodeNumber;
+ const GROUP_AFFINITY *cores = &info->NumaNode.GroupMask;
+ struct lcore_map *lcore;
+ unsigned int socket_id;
+ unsigned int i;
+
+ /* NUMA node may be reported multiple times if it includes
+ * cores from different processor groups, e. g. 80 cores
+ * of a physical processor comprise one NUMA node, but two
+ * processor groups, because group size is limited by 32/64.
+ */
+ for (socket_id = 0; socket_id < cpu_map.socket_count; socket_id++) {
+ if (cpu_map.sockets[socket_id].node_id == node_id)
+ break;
+ }
+
+ if (socket_id == cpu_map.socket_count) {
+ if (socket_id == RTE_DIM(cpu_map.sockets))
+ return true;
+
+ cpu_map.sockets[socket_id].node_id = node_id;
+ cpu_map.socket_count++;
+ }
+
+ for (i = 0; i < EAL_PROCESSOR_GROUP_SIZE; i++) {
+ if ((cores->Mask & ((KAFFINITY)1 << i)) == 0)
+ continue;
+
+ if (cpu_map.lcore_count == RTE_DIM(cpu_map.lcores))
+ return true;
+
+ lcore = &cpu_map.lcores[cpu_map.lcore_count];
+ lcore->socket_id = socket_id;
+ lcore->core_id = cores->Group * EAL_PROCESSOR_GROUP_SIZE + i;
+ cpu_map.lcore_count++;
+ }
+ return false;
+}
+
int
eal_create_cpu_map(void)
{
SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *infos, *info;
DWORD infos_size;
bool full = false;
+ int ret = 0;
+ infos = NULL;
infos_size = 0;
if (!GetLogicalProcessorInformationEx(
RelationNumaNode, NULL, &infos_size)) {
@@ -62,7 +166,8 @@ struct cpu_map {
log_early("Cannot get NUMA node info size, error %lu\n",
GetLastError());
rte_errno = ENOMEM;
- return -1;
+ ret = -1;
+ goto exit;
}
}
@@ -83,52 +188,24 @@ struct cpu_map {
info = infos;
while ((uint8_t *)info - (uint8_t *)infos < infos_size) {
- unsigned int node_id = info->NumaNode.NodeNumber;
- GROUP_AFFINITY *cores = &info->NumaNode.GroupMask;
- struct lcore_map *lcore;
- unsigned int i, socket_id;
-
- /* NUMA node may be reported multiple times if it includes
- * cores from different processor groups, e. g. 80 cores
- * of a physical processor comprise one NUMA node, but two
- * processor groups, because group size is limited by 32/64.
- */
- for (socket_id = 0; socket_id < cpu_map.socket_count;
- socket_id++) {
- if (cpu_map.sockets[socket_id].node_id == node_id)
- break;
- }
-
- if (socket_id == cpu_map.socket_count) {
- if (socket_id == RTE_DIM(cpu_map.sockets)) {
- full = true;
- goto exit;
- }
-
- cpu_map.sockets[socket_id].node_id = node_id;
- cpu_map.socket_count++;
- }
-
- for (i = 0; i < EAL_PROCESSOR_GROUP_SIZE; i++) {
- if ((cores->Mask & ((KAFFINITY)1 << i)) == 0)
- continue;
-
- if (cpu_map.lcore_count == RTE_DIM(cpu_map.lcores)) {
- full = true;
- goto exit;
- }
-
- lcore = &cpu_map.lcores[cpu_map.lcore_count];
- lcore->socket_id = socket_id;
- lcore->core_id =
- cores->Group * EAL_PROCESSOR_GROUP_SIZE + i;
- cpu_map.lcore_count++;
+ if (eal_create_lcore_map(info)) {
+ full = true;
+ break;
}
info = (SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *)(
(uint8_t *)info + info->Size);
}
+ if (eal_query_group_affinity()) {
+ /*
+ * No need to set rte_errno here.
+ * It is set by eal_query_group_affinity().
+ */
+ ret = -1;
+ goto exit;
+ }
+
exit:
if (full) {
/* Not a fatal error, but important for troubleshooting. */
@@ -164,3 +241,11 @@ struct cpu_map {
{
return cpu_map.sockets[socket_id].node_id;
}
+
+PGROUP_AFFINITY
+eal_get_cpu_affinity(size_t cpu_index)
+{
+ RTE_VERIFY(cpu_index < CPU_SETSIZE);
+
+ return &cpu_map.cpus[cpu_index];
+}
diff --git a/lib/eal/windows/eal_windows.h b/lib/eal/windows/eal_windows.h
index 245aa60..c96eca5 100644
--- a/lib/eal/windows/eal_windows.h
+++ b/lib/eal/windows/eal_windows.h
@@ -56,6 +56,16 @@
unsigned int eal_socket_numa_node(unsigned int socket_id);
/**
+ * Get pointer to the group affinity for the cpu.
+ *
+ * @param cpu_index
+ * Index of the cpu, as it comes from rte_cpuset_t.
+ * @return
+ * Pointer to the group affinity for the cpu.
+ */
+PGROUP_AFFINITY eal_get_cpu_affinity(size_t cpu_index);
+
+/**
* Schedule code for execution in the interrupt thread.
*
* @param func
diff --git a/lib/eal/windows/include/rte_os.h b/lib/eal/windows/include/rte_os.h
index a0a3114..1c33058 100644
--- a/lib/eal/windows/include/rte_os.h
+++ b/lib/eal/windows/include/rte_os.h
@@ -14,6 +14,8 @@
#include <stdlib.h>
#include <string.h>
+#include <sched.h>
+
#ifdef __cplusplus
extern "C" {
#endif
diff --git a/lib/eal/windows/rte_thread.c b/lib/eal/windows/rte_thread.c
index b3b5362..b4fbcc8 100644
--- a/lib/eal/windows/rte_thread.c
+++ b/lib/eal/windows/rte_thread.c
@@ -5,7 +5,8 @@
#include <rte_common.h>
#include <rte_errno.h>
#include <rte_thread.h>
-#include <rte_windows.h>
+
+#include "eal_windows.h"
struct eal_tls_key {
DWORD thread_index;
@@ -135,3 +136,131 @@ struct eal_tls_key {
}
return output;
}
+
+static int
+rte_convert_cpuset_to_affinity(const rte_cpuset_t *cpuset,
+ PGROUP_AFFINITY affinity)
+{
+ int ret = 0;
+ PGROUP_AFFINITY cpu_affinity = NULL;
+ unsigned int cpu_idx;
+
+ memset(affinity, 0, sizeof(GROUP_AFFINITY));
+ affinity->Group = (USHORT)-1;
+
+ /* Check that all cpus of the set belong to the same processor group and
+ * accumulate thread affinity to be applied.
+ */
+ for (cpu_idx = 0; cpu_idx < CPU_SETSIZE; cpu_idx++) {
+ if (!CPU_ISSET(cpu_idx, cpuset))
+ continue;
+
+ cpu_affinity = eal_get_cpu_affinity(cpu_idx);
+
+ if (affinity->Group == (USHORT)-1) {
+ affinity->Group = cpu_affinity->Group;
+ } else if (affinity->Group != cpu_affinity->Group) {
+ ret = EINVAL;
+ goto cleanup;
+ }
+
+ affinity->Mask |= cpu_affinity->Mask;
+ }
+
+ if (affinity->Mask == 0) {
+ ret = EINVAL;
+ goto cleanup;
+ }
+
+cleanup:
+ return ret;
+}
+
+int
+rte_thread_set_affinity_by_id(rte_thread_t thread_id,
+ const rte_cpuset_t *cpuset)
+{
+ int ret = 0;
+ GROUP_AFFINITY thread_affinity;
+ HANDLE thread_handle = NULL;
+
+ if (cpuset == NULL) {
+ ret = EINVAL;
+ goto cleanup;
+ }
+
+ ret = rte_convert_cpuset_to_affinity(cpuset, &thread_affinity);
+ if (ret != 0) {
+ RTE_LOG(DEBUG, EAL, "Unable to convert cpuset to thread affinity\n");
+ goto cleanup;
+ }
+
+ thread_handle = OpenThread(THREAD_ALL_ACCESS, FALSE,
+ thread_id.opaque_id);
+ if (thread_handle == NULL) {
+ ret = thread_log_last_error("OpenThread()");
+ goto cleanup;
+ }
+
+ if (!SetThreadGroupAffinity(thread_handle, &thread_affinity, NULL)) {
+ ret = thread_log_last_error("SetThreadGroupAffinity()");
+ goto cleanup;
+ }
+
+cleanup:
+ if (thread_handle != NULL) {
+ CloseHandle(thread_handle);
+ thread_handle = NULL;
+ }
+
+ return ret;
+}
+
+int
+rte_thread_get_affinity_by_id(rte_thread_t thread_id,
+ rte_cpuset_t *cpuset)
+{
+ HANDLE thread_handle = NULL;
+ PGROUP_AFFINITY cpu_affinity;
+ GROUP_AFFINITY thread_affinity;
+ unsigned int cpu_idx;
+ int ret = 0;
+
+ if (cpuset == NULL) {
+ ret = EINVAL;
+ goto cleanup;
+ }
+
+ thread_handle = OpenThread(THREAD_ALL_ACCESS, FALSE,
+ thread_id.opaque_id);
+ if (thread_handle == NULL) {
+ ret = thread_log_last_error("OpenThread()");
+ goto cleanup;
+ }
+
+ /* obtain previous thread affinity */
+ if (!GetThreadGroupAffinity(thread_handle, &thread_affinity)) {
+ ret = thread_log_last_error("GetThreadGroupAffinity()");
+ goto cleanup;
+ }
+
+ CPU_ZERO(cpuset);
+
+ /* Convert affinity to DPDK cpu set */
+ for (cpu_idx = 0; cpu_idx < CPU_SETSIZE; cpu_idx++) {
+
+ cpu_affinity = eal_get_cpu_affinity(cpu_idx);
+
+ if ((cpu_affinity->Group == thread_affinity.Group) &&
+ ((cpu_affinity->Mask & thread_affinity.Mask) != 0)) {
+ CPU_SET(cpu_idx, cpuset);
+ }
+ }
+
+cleanup:
+ if (thread_handle != NULL) {
+ CloseHandle(thread_handle);
+ thread_handle = NULL;
+ }
+ return ret;
+}
--
1.8.3.1