Re: [RFC] kallsyms: embed source file:line info in kernel stack traces

On 03. 03. 26, 9:11, Geert Uytterhoeven wrote:
> On Tue, 3 Mar 2026 at 07:26, Richard Weinberger <[email protected]> wrote:
>>> Von: "Sasha Levin" <[email protected]>
>>> Add CONFIG_KALLSYMS_LINEINFO, which embeds a compact address-to-line
>>> lookup table in the kernel image so stack traces directly print source
>>> file and line number information:
> 
>>> Memory footprint measured with a simple KVM guest x86_64 config:
>>>
>>>   Table: 4,597,583 entries from 4,841 source files
>>>     lineinfo_addrs[]     4,597,583 x u32  = 17.5 MiB
>>>     lineinfo_file_ids[]  4,597,583 x u16  =  8.8 MiB
>>>     lineinfo_lines[]     4,597,583 x u32  = 17.5 MiB
>>>     file_offsets + filenames              ~  0.1 MiB
>>>     Total .rodata increase:              ~ 44.0 MiB
>>>
>>>   vmlinux (stripped):  529 MiB -> 573 MiB  (+44 MiB / +8.3%)
>>
>> Hm, that's a significant increase.
> 
> Other random idea: this data is only needed in case of a crash.
> Perhaps it can be stored compressed, and only be decompressed
> when needed, or even during look-up?

But obviously not when dumping OOM stack traces :P.

-- 
js
suse labs