perf augmented_raw_syscalls: Postpone tmp map lookup to after pid_filter

No sense in doing that lookup before figuring out if it will be used,
i.e. if the pid is being filtered that tmp space lookup will be useless.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-o74yggieorucfg4j74tb6rta@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/examples/bpf/augmented_raw_syscalls.c b/tools/perf/examples/bpf/augmented_raw_syscalls.c
index b85b177..0a8d217 100644 (file)
--- a/tools/perf/examples/bpf/augmented_raw_syscalls.c
+++ b/tools/perf/examples/bpf/augmented_raw_syscalls.c
@@ -250,13 +250,13 @@ int sys_enter(struct syscall_enter_args *args)
        struct syscall *syscall;
        int key = 0;
 
+       if (pid_filter__has(&pids_filtered, getpid()))
+               return 0;
+
         augmented_args = bpf_map_lookup_elem(&augmented_args_tmp, &key);
         if (augmented_args == NULL)
                 return 1;
 
-       if (pid_filter__has(&pids_filtered, getpid()))
-               return 0;
-
        probe_read(&augmented_args->args, sizeof(augmented_args->args), args);
 
        /*