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perf bpf: Clone bpf stdout events in multiple bpf scripts

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This patch allows cloning bpf-output event configuration among multiple
bpf scripts. If there exist a map named '__bpf_output__' and not
configured using 'map:__bpf_output__.event=', this patch clones the
configuration of another '__bpf_stdout__' map. For example, following
command:

  # perf trace --ev bpf-output/no-inherit,name=evt/ \
               --ev ./test_bpf_trace.c/map:__bpf_stdout__.event=evt/ \
               --ev ./test_bpf_trace2.c usleep 100000

equals to:

  # perf trace --ev bpf-output/no-inherit,name=evt/ \
               --ev ./test_bpf_trace.c/map:__bpf_stdout__.event=evt/  \
               --ev ./test_bpf_trace2.c/map:__bpf_stdout__.event=evt/ \
               usleep 100000

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Suggested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1460128045-97310-4-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wang Nan 2016-04-08 15:07:24 +00:00 • committed by Arnaldo Carvalho de Melo
parent f9383452a2
commit d78885739a
4 changed files with 158 additions and 0 deletions
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19
tools/perf/util/bpf-loader.h
View file

@ -79,6 +79,11 @@ int bpf__strerror_config_obj(struct bpf_object *obj,
size_t size);
int bpf__apply_obj_config(void);
int bpf__strerror_apply_obj_config(int err, char *buf, size_t size);
int bpf__setup_stdout(struct perf_evlist *evlist);
int bpf__strerror_setup_stdout(struct perf_evlist *evlist, int err,
char *buf, size_t size);
#else
static inline struct bpf_object *
bpf__prepare_load(const char *filename __maybe_unused,
@ -124,6 +129,12 @@ bpf__apply_obj_config(void)
return 0;
}
static inline int
bpf__setup_stdout(struct perf_evlist *evlist __maybe_unused)
{
return 0;
}
static inline int
__bpf_strerror(char *buf, size_t size)
{
@ -177,5 +188,13 @@ bpf__strerror_apply_obj_config(int err __maybe_unused,
{
return __bpf_strerror(buf, size);
}
static inline int
bpf__strerror_setup_stdout(struct perf_evlist *evlist __maybe_unused,
int err __maybe_unused, char *buf,
size_t size)
{
return __bpf_strerror(buf, size);
}
#endif
#endif