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| author |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-06-04 15:31:28 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-06-05 09:47:58 -0300 |
| commit | 0c95a7ff76fb1c5bb614e6ee438fce06d1b957c8 (patch) | |
| tree | 82fc75ec89b522e36ca62f5991aa4cf726ffe265 /tools/perf/examples/bpf | |
| parent | perf augmented_raw_syscalls: Tell which args are filenames and how many bytes to copy (diff) | |
| download | linux-dev-0c95a7ff76fb1c5bb614e6ee438fce06d1b957c8.tar.xz linux-dev-0c95a7ff76fb1c5bb614e6ee438fce06d1b957c8.zip | |
perf augmented_raw_syscalls: Move the probe_read_str to a separate function
One more step into copying multiple filenames to support syscalls like
rename*.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-xdqtjexdyp81oomm1rkzeifl@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/examples/bpf')
| -rw-r--r-- | tools/perf/examples/bpf/augmented_raw_syscalls.c | 27 |
1 files changed, 18 insertions, 9 deletions
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); } |