From 0c95a7ff76fb1c5bb614e6ee438fce06d1b957c8 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Tue, 4 Jun 2019 15:31:28 -0300 Subject: perf augmented_raw_syscalls: Move the probe_read_str to a separate function MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit One more step into copying multiple filenames to support syscalls like rename*. Cc: Adrian Hunter Cc: Brendan Gregg Cc: Jiri Olsa Cc: Luis Cláudio Gonçalves Cc: Namhyung Kim Link: https://lkml.kernel.org/n/tip-xdqtjexdyp81oomm1rkzeifl@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/examples/bpf/augmented_raw_syscalls.c | 27 ++++++++++++++++-------- 1 file changed, 18 insertions(+), 9 deletions(-) (limited to 'tools/perf/examples/bpf') diff --git a/tools/perf/examples/bpf/augmented_raw_syscalls.c b/tools/perf/examples/bpf/augmented_raw_syscalls.c index c9fd3b4d8e55..356513e81ec1 100644 --- a/tools/perf/examples/bpf/augmented_raw_syscalls.c +++ b/tools/perf/examples/bpf/augmented_raw_syscalls.c @@ -60,11 +60,27 @@ struct augmented_args_filename { bpf_map(augmented_filename_map, PERCPU_ARRAY, int, struct augmented_args_filename, 1); +static inline +unsigned int augmented_args__read_filename(struct augmented_args_filename *augmented_args, + const void *filename_arg, unsigned int filename_len) +{ + unsigned int len = sizeof(*augmented_args); + + augmented_args->filename.reserved = 0; + augmented_args->filename.size = probe_read_str(&augmented_args->filename.value, filename_len, filename_arg); + if (augmented_args->filename.size < sizeof(augmented_args->filename.value)) { + len -= sizeof(augmented_args->filename.value) - augmented_args->filename.size; + len &= sizeof(augmented_args->filename.value) - 1; + } + + return len; +} + SEC("raw_syscalls:sys_enter") int sys_enter(struct syscall_enter_args *args) { struct augmented_args_filename *augmented_args; - unsigned int len = sizeof(*augmented_args), filename_len; + unsigned int len, filename_len; const void *filename_arg = NULL; struct syscall *syscall; int key = 0; @@ -182,14 +198,7 @@ processed 46 insns (limit 1000000) max_states_per_insn 0 total_states 12 peak_st loop_iter_last(5) if (filename_arg != NULL && filename_len <= sizeof(augmented_args->filename.value)) { - augmented_args->filename.reserved = 0; - augmented_args->filename.size = probe_read_str(&augmented_args->filename.value, - filename_len, - filename_arg); - if (augmented_args->filename.size < sizeof(augmented_args->filename.value)) { - len -= sizeof(augmented_args->filename.value) - augmented_args->filename.size; - len &= sizeof(augmented_args->filename.value) - 1; - } + len = augmented_args__read_filename(augmented_args, filename_arg, filename_len); } else { len = sizeof(augmented_args->args); } -- cgit v1.2.3