Perf doesn't display kernel symbols anymore (bisected commit 659ad3492b91 ("perf maps: Switch from rbtree to lazily sorted array for addresses"))

[Christophe Leroy]

Le 06/01/2025 à 22:46, Namhyung Kim a écrit :
>>
>> And in System.map I have:
>>
>> c136a000 D __start___bug_table
>> c1377c14 D __stop___bug_table
>> c1378000 B __bss_start
>> c1378000 B _edata
>> c1378000 B initcall_debug
>> c1378004 B reset_devices
>>
>> Should perf try to locate the very last symbol when it doesn't find _edata ?
>> Or should architecture's link script be modified ? Otherwise commit
>> 69a87a32f5cd ("perf machine: Include data symbols in the kernel map") is
>> just pointless.
> 
> Let's go with kallsyms__get_symbol_start().  I think it's the most
> straight-forward and simplest fix.
> 

Ok, I did that, see patch 
https://lore.kernel.org/linux-perf-users/b3ee1994d95257cb7f2de037c5030ba7d1bed404.1736327613.git.christophe.leroy@csgroup.eu/T/#u

And for the _edata which is sometimes missing, I send patch 
https://lore.kernel.org/linux-perf-users/2fec8c50c271dff59f0177ff0884b6c374486ba5.1736327770.git.christophe.leroy@csgroup.eu/T/#u

Christophe