vlib: improve automatic core pinning
Type: feature
Auto core pinning now fetches vpp cpu affinity list
using pthread api. This enables us to do core-pinning in
environments where the host cpu list does not necessarily align
with cpus available to vpp
Change-Id: Ife8c2a2351c08c5c6c4fdf7c729eeff2697bc39a
Signed-off-by: hsandid <halsandi@cisco.com>
diff --git a/src/vppinfra/unix-misc.c b/src/vppinfra/unix-misc.c
index e0591ff..4dbc5ce 100644
--- a/src/vppinfra/unix-misc.c
+++ b/src/vppinfra/unix-misc.c
@@ -46,6 +46,7 @@
#include <sys/stat.h>
#include <sys/types.h>
+#include <sys/syscall.h>
#include <sys/uio.h> /* writev */
#include <fcntl.h>
#include <stdio.h> /* for sprintf */
@@ -275,6 +276,36 @@
}
__clib_export clib_bitmap_t *
+os_get_cpu_affinity_bitmap (int pid)
+{
+#if __linux
+ int index, ret;
+ cpu_set_t cpuset;
+ uword *affinity_cpus;
+
+ clib_bitmap_alloc (affinity_cpus, sizeof (cpu_set_t));
+ clib_bitmap_zero (affinity_cpus);
+
+ __CPU_ZERO_S (sizeof (cpu_set_t), &cpuset);
+
+ ret = syscall (SYS_sched_getaffinity, 0, sizeof (cpu_set_t), &cpuset);
+
+ if (ret < 0)
+ {
+ clib_bitmap_free (affinity_cpus);
+ return 0;
+ }
+
+ for (index = 0; index < sizeof (cpu_set_t); index++)
+ if (__CPU_ISSET_S (index, sizeof (cpu_set_t), &cpuset))
+ clib_bitmap_set (affinity_cpus, index, 1);
+ return affinity_cpus;
+#else
+ return 0;
+#endif
+}
+
+__clib_export clib_bitmap_t *
os_get_online_cpu_node_bitmap ()
{
#if __linux__