* [PATCH] bpf: allocate the buffers BPF map to fit highest CPU id
@ 2025-12-11 22:22 Kris Van Hees
0 siblings, 0 replies; 2+ messages in thread
From: Kris Van Hees @ 2025-12-11 22:22 UTC (permalink / raw)
To: dtrace, dtrace-devel
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@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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH] bpf: allocate the buffers BPF map to fit highest CPU id
@ 2025-12-11 22:47 Kris Van Hees
0 siblings, 0 replies; 2+ messages in thread
From: Kris Van Hees @ 2025-12-11 22:47 UTC (permalink / raw)
To: dtrace, dtrace-devel
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@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
^ permalink raw reply related [flat|nested] 2+ messages in thread
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