Hi Masami, I think this worked at some point?
[root@jouet acme]# perf probe -F | tail zswap_frontswap_init zswap_frontswap_invalidate_area zswap_frontswap_invalidate_page zswap_frontswap_load zswap_frontswap_store zswap_pool_create zswap_pool_current zswap_update_total_size zswap_writeback_entry zswap_zpool_param_set [root@jouet acme]# perf probe -F rt_sp* no symbols found in [kernel.kallsyms], maybe install a debug package? Failed to load symbols in kernel [root@jouet acme]# perf probe -F rt_sp\* no symbols found in [kernel.kallsyms], maybe install a debug package? Failed to load symbols in kernel [root@jouet acme]# I.e. the second message is misleading :-\ - Arnaldo