[DTrace-devel] [PATCH] bpf: allocate the buffers BPF map to fit highest CPU id

[Kris Van Hees]

Even when less than the possible number of CPUs are online, the 'buffers'
BPF map should be allocated based on the highest possible CPU id because
probe data is written to the bufer that corresponds to a given CPU id,
which could be part of non-sequential CPU id configurations.

Signed-off-by: Kris Van Hees <kris.van.hees at oracle.com>
---
 libdtrace/dt_bpf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libdtrace/dt_bpf.c b/libdtrace/dt_bpf.c
index 0a57b7d2..6568a572 100644
--- a/libdtrace/dt_bpf.c
+++ b/libdtrace/dt_bpf.c
@@ -755,7 +755,7 @@ gmap_create_buffers(dtrace_hdl_t *dtp)
 {
 	return create_gmap(dtp, "buffers", BPF_MAP_TYPE_PERF_EVENT_ARRAY,
 			   sizeof(uint32_t), sizeof(uint32_t),
-			   dtp->dt_conf.num_online_cpus);
+			   dtp->dt_conf.max_cpuid);
 }
 
 /*
-- 
2.43.5