On 2020-04-23, HAGIO KAZUHITO(萩尾 一仁) <k-hagio-ab(a)nec.com> wrote:
> Should all struct sizes and field offsets be exported? It
> would look something like this:
>
>         VMCOREINFO_SYMBOL(prb);
>
>         VMCOREINFO_STRUCT_SIZE(printk_ringbuffer);
>         VMCOREINFO_OFFSET(printk_ringbuffer, desc_ring);
>         VMCOREINFO_OFFSET(printk_ringbuffer, text_data_ring);
>         VMCOREINFO_OFFSET(printk_ringbuffer, dict_data_ring);
>         VMCOREINFO_OFFSET(printk_ringbuffer, fail);
>
>         VMCOREINFO_STRUCT_SIZE(prb_desc_ring);
>         VMCOREINFO_OFFSET(prb_desc_ring, count_bits);
>         VMCOREINFO_OFFSET(prb_desc_ring, descs);
>         VMCOREINFO_OFFSET(prb_desc_ring, head_id);
>         VMCOREINFO_OFFSET(prb_desc_ring, tail_id);
>
>         VMCOREINFO_STRUCT_SIZE(prb_desc);
>         VMCOREINFO_OFFSET(prb_desc, info);
>         VMCOREINFO_OFFSET(prb_desc, state_var);
>         VMCOREINFO_OFFSET(prb_desc, text_blk_lpos);
>         VMCOREINFO_OFFSET(prb_desc, dict_blk_lpos);
>
>         VMCOREINFO_STRUCT_SIZE(prb_data_blk_lpos);
>         VMCOREINFO_OFFSET(prb_data_blk_lpos, begin);
>         VMCOREINFO_OFFSET(prb_data_blk_lpos, next);
>
>         VMCOREINFO_STRUCT_SIZE(printk_info);
>         VMCOREINFO_OFFSET(printk_info, seq);
>         VMCOREINFO_OFFSET(printk_info, ts_nsec);
>         VMCOREINFO_OFFSET(printk_info, text_len);
>         VMCOREINFO_OFFSET(printk_info, dict_len);
>         VMCOREINFO_OFFSET(printk_info, caller_id);
>
>         VMCOREINFO_STRUCT_SIZE(prb_data_ring);
>         VMCOREINFO_OFFSET(prb_data_ring, size_bits);
>         VMCOREINFO_OFFSET(prb_data_ring, data);
>         VMCOREINFO_OFFSET(prb_data_ring, head_id);
>         VMCOREINFO_OFFSET(prb_data_ring, tail_id);
 If there is no efficient way, we will need all of the entries in
 VMCOREINFO. 
It seems like a lot to export everything, but I don't have a problem
with it. If we decide to export everything (which I expect we will need
to do), then I would change my crash(8) implementation to also rely only
on the VMCOREINFO. I see no point in having some implementations using
debug data and other implementations using VMCOREINFO data, if
VMCOREINFO has everything that is needed.
John Ogness