Commit 0c95a7ff authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo
Browse files

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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 4cae8675

tools/perf/examples/bpf/augmented_raw_syscalls.c

+18 −9
Original line number Diff line number Diff line
@@ -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);

	}

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