From: Arnaldo Carvalho de Melo <a...@redhat.com> Almost there, next step is to copy more than one filename payload.
Probably to read syscall arg structs, etc we'll need just a variation of this that will decide what to use, if probe_read_str() or plain probe_read for structs, i.e. fixed size. Cc: Adrian Hunter <adrian.hun...@intel.com> Cc: Brendan Gregg <brendan.d.gr...@gmail.com> Cc: Jiri Olsa <jo...@kernel.org> Cc: Luis Cláudio Gonçalves <lclau...@redhat.com> Cc: Namhyung Kim <namhy...@kernel.org> Link: https://lkml.kernel.org/n/tip-uf6u0pld6xe4xuo16f04o...@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com> --- tools/perf/examples/bpf/augmented_raw_syscalls.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/tools/perf/examples/bpf/augmented_raw_syscalls.c b/tools/perf/examples/bpf/augmented_raw_syscalls.c index 5054b4bc9e55..2f822bb51717 100644 --- a/tools/perf/examples/bpf/augmented_raw_syscalls.c +++ b/tools/perf/examples/bpf/augmented_raw_syscalls.c @@ -102,8 +102,6 @@ int sys_enter(struct syscall_enter_args *args) * initial, non-augmented raw_syscalls:sys_enter payload. */ unsigned int len = sizeof(augmented_args->args); - unsigned int filename_len; - const void *filename_arg = NULL; struct syscall *syscall; int key = 0; @@ -206,8 +204,10 @@ processed 46 insns (limit 1000000) max_states_per_insn 0 total_states 12 peak_st #define __loop_iter(arg) \ if (syscall->string_args_len[arg] != 0) { \ - filename_len = syscall->string_args_len[arg]; \ - filename_arg = (const void *)args->args[arg]; + unsigned int filename_len = syscall->string_args_len[arg]; \ + const void *filename_arg = (const void *)args->args[arg]; \ + if (filename_len <= sizeof(augmented_args->filename.value)) \ + len += augmented_filename__read(&augmented_args->filename, filename_arg, filename_len); #define loop_iter_first() __loop_iter(0); } #define loop_iter(arg) else __loop_iter(arg); } #define loop_iter_last(arg) else __loop_iter(arg); __asm__ __volatile__("": : :"memory"); } @@ -219,10 +219,6 @@ processed 46 insns (limit 1000000) max_states_per_insn 0 total_states 12 peak_st loop_iter(4) loop_iter_last(5) - if (filename_arg != NULL && filename_len <= sizeof(augmented_args->filename.value)) { - len += augmented_filename__read(&augmented_args->filename, filename_arg, filename_len); - } - /* If perf_event_output fails, return non-zero so that it gets recorded unaugmented */ return perf_event_output(args, &__augmented_syscalls__, BPF_F_CURRENT_CPU, augmented_args, len); } -- 2.20.1
