Em Fri, Nov 13, 2015 at 12:29:13PM +0000, Wang Nan escreveu:
> By extending the syntax of BPF object section names, this patch allows
> user to attach BPF programs to symbol in modules. For example:
>
> SEC("module=i915\n"
> "parse_cmds=i915_parse_cmds")
> int parse_cmds(void *ctx)
> {
> return 1;
> }
>
> Implementation is very simple: like what 'perf probe' does, for module,
> fill 'uprobe' field in 'struct perf_probe_event'. Other parts would be
> done automatically.
>
> Signed-off-by: Wang Nan <[email protected]>
> Cc: Alexei Starovoitov <[email protected]>
> Cc: Brendan Gregg <[email protected]>
> Cc: Daniel Borkmann <[email protected]>
> Cc: David Ahern <[email protected]>
> Cc: He Kuang <[email protected]>
> Cc: Jiri Olsa <[email protected]>
> Cc: Kaixu Xia <[email protected]>
> Cc: Masami Hiramatsu <[email protected]>
> Cc: Namhyung Kim <[email protected]>
> Cc: Paul Mackerras <[email protected]>
> Cc: Peter Zijlstra <[email protected]>
> Cc: Zefan Li <[email protected]>
> Cc: [email protected]
> Cc: Arnaldo Carvalho de Melo <[email protected]>
> Link:
> http://lkml.kernel.org/n/[email protected]
> ---
> tools/perf/util/bpf-loader.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
> index 5f5505d..8d78785 100644
> --- a/tools/perf/util/bpf-loader.c
> +++ b/tools/perf/util/bpf-loader.c
> @@ -117,6 +117,14 @@ config__exec(const char *value, struct perf_probe_event
> *pev)
> return 0;
> }
>
> +static int
> +config__module(const char *value, struct perf_probe_event *pev)
> +{
> + pev->uprobes = false;
> + pev->target = strdup(value);
> + return 0;
> +}
check strdup return
> +
> static struct {
> const char *key;
> const char *usage;
> @@ -129,6 +137,12 @@ static struct {
> "Set uprobe target",
> config__exec,
> },
> + {
> + "module",
> + "module=<module name> ",
> + "Set kprobe module",
> + config__module,
> + }
Named initializers, please.
> };
>
> static int
> --
> 1.8.3.4
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