[DTrace-devel] [PATCH 12/19] Increase size of BPF probes map

[Eugene Loh]

Just to be clear, this patch is (thankfully) being withdrawn. Whew.

On 8/29/24 01:25, eugene.loh at oracle.com wrote:
> From: Eugene Loh <eugene.loh at oracle.com>
>
> We are going to support discovery of new probes after dtrace is
> launched.  For example, there could be a pid or USDT probe with a
> wildcard pid specification that could be matched by a process that
> has not yet started.  Or, a process could load a shared library.
>
> This means the probe map will have to grow.  For now, just wire in
> some headroom, as ugly a hack as this is.
>
> Signed-off-by: Eugene Loh <eugene.loh 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 70803e3c..75e48962 100644
> --- a/libdtrace/dt_bpf.c
> +++ b/libdtrace/dt_bpf.c
> @@ -920,7 +920,7 @@ gmap_create_probes(dtrace_hdl_t *dtp)
>   
>   	fd = create_gmap(dtp, "probes", BPF_MAP_TYPE_HASH, sizeof(uint32_t),
>   			 sizeof(dt_bpf_probe_t),
> -			 dt_list_length(&dtp->dt_enablings));
> +			 dt_list_length(&dtp->dt_enablings) + 1000);
>   	if (fd == -1)
>   		return -1;
>