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perf augmented_raw_syscalls: Move the probe_read_str to a separate function

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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>
This commit is contained in:
Arnaldo Carvalho de Melo 2019-06-04 15:31:28 -03:00
parent 4cae8675ea
commit 0c95a7ff76
1 changed files with 18 additions and 9 deletions
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27
tools/perf/examples/bpf/augmented_raw_syscalls.c
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@ -60,11 +60,27 @@ struct augmented_args_filename {
bpf_map(augmented_filename_map, PERCPU_ARRAY, int, struct augmented_args_filename, 1); 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") SEC("raw_syscalls:sys_enter")
int sys_enter(struct syscall_enter_args *args) int sys_enter(struct syscall_enter_args *args)
{ {
struct augmented_args_filename *augmented_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; const void *filename_arg = NULL;
struct syscall *syscall; struct syscall *syscall;
int key = 0; 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) loop_iter_last(5)
if (filename_arg != NULL && filename_len <= sizeof(augmented_args->filename.value)) { if (filename_arg != NULL && filename_len <= sizeof(augmented_args->filename.value)) {
augmented_args->filename.reserved = 0; len = augmented_args__read_filename(augmented_args, filename_arg, filename_len);
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;
}
} else { } else {
len = sizeof(augmented_args->args); len = sizeof(augmented_args->args);
} }