bpf: Change modules resolving for kprobe multi link

We currently use module_kallsyms_on_each_symbol that iterates all
modules/symbols and we try to lookup each such address in user
provided symbols/addresses to get list of used modules.

This fix instead only iterates provided kprobe addresses and calls
__module_address on each to get list of used modules. This turned
out to be simpler and also bit faster.

On my setup with workload (executed 10 times):

   # test_progs -t kprobe_multi_bench_attach/modules

Current code:

 Performance counter stats for './test.sh' (5 runs):

    76,081,161,596      cycles:k                   ( +-  0.47% )

           18.3867 +- 0.0992 seconds time elapsed  ( +-  0.54% )

With the fix:

 Performance counter stats for './test.sh' (5 runs):

    74,079,889,063      cycles:k                   ( +-  0.04% )

           17.8514 +- 0.0218 seconds time elapsed  ( +-  0.12% )

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Reviewed-by: Zhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20230116101009.23694-4-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

0 files changed, 0 insertions, 0 deletions