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Date: Fri, 13 Nov 2015 12:29:14 +0000
From: Wang Nan <wangnan0@...wei.com>
To: <acme@...nel.org>, <masami.hiramatsu.pt@...achi.com>,
<ast@...nel.org>
CC: <lizefan@...wei.com>, <pi3orama@....com>,
<linux-kernel@...r.kernel.org>, Wang Nan <wangnan0@...wei.com>,
Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 05/12] perf tools: Allow BPF program config probing options
By extending the syntax of BPF object section names, this patch allows
user to config probing options like what they can do in 'perf probe'.
Test result:
For following BPF file bpf.c:
SEC("inlines=no\n"
"func=SyS_dup?")
int func(void *ctx)
{
return 1;
}
Cmdline:
# ./perf record -e ./test_probe_glob.c ls /
...
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.013 MB perf.data ]
# ./perf evlist
perf_bpf_probe:func_1
perf_bpf_probe:func
Change "inlines=no" to "inlines=yes":
Cmdline:
# ./perf record -e ./test_probe_glob.c ls /
...
[ perf record: Woken up 2 times to write data ]
[ perf record: Captured and wrote 0.013 MB perf.data ]
# ./perf evlist
perf_bpf_probe:func_3
perf_bpf_probe:func_2
perf_bpf_probe:func_1
perf_bpf_probe:func
Signed-off-by: Wang Nan <wangnan0@...wei.com>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Zefan Li <lizefan@...wei.com>
Cc: pi3orama@....com
---
tools/perf/util/bpf-loader.c | 50 +++++++++++++++++++++++++++++++++++++++++++-
tools/perf/util/config.c | 9 ++++----
tools/perf/util/util.c | 18 ++++++++++++++++
tools/perf/util/util.h | 2 ++
4 files changed, 74 insertions(+), 5 deletions(-)
diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index 8d78785..a368ead 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -125,6 +125,38 @@ config__module(const char *value, struct perf_probe_event *pev)
return 0;
}
+static int
+config__bool(const char *value,
+ bool *pbool, bool invert)
+{
+ int err;
+ bool bool_value;
+
+ if (!pbool)
+ return -EINVAL;
+
+ err = convert_str_to_bool(value, &bool_value);
+ if (err)
+ return err;
+
+ *pbool = invert ? !bool_value : bool_value;
+ return 0;
+}
+
+static int
+config__inlines(const char *value,
+ struct perf_probe_event *pev __maybe_unused)
+{
+ return config__bool(value, &probe_conf.no_inlines, true);
+}
+
+static int
+config__force(const char *value,
+ struct perf_probe_event *pev __maybe_unused)
+{
+ return config__bool(value, &probe_conf.force_add, false);
+}
+
static struct {
const char *key;
const char *usage;
@@ -142,7 +174,19 @@ static struct {
"module=<module name> ",
"Set kprobe module",
config__module,
- }
+ },
+ {
+ "inlines",
+ "inlines=[yes|no] ",
+ "Probe at inline symbol",
+ config__inlines,
+ },
+ {
+ "force",
+ "force=[yes|no] ",
+ "Forcibly add events with existing name",
+ config__force,
+ },
};
static int
@@ -240,6 +284,10 @@ config_bpf_program(struct bpf_program *prog)
const char *config_str;
int err;
+ /* Initialize per-program probing setting */
+ probe_conf.no_inlines = false;
+ probe_conf.force_add = false;
+
config_str = bpf_program__title(prog, false);
if (IS_ERR(config_str)) {
pr_debug("bpf: unable to get title for program\n");
diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index 2e452ac..8219798 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -351,15 +351,16 @@ int perf_config_int(const char *name, const char *value)
static int perf_config_bool_or_int(const char *name, const char *value, int *is_bool)
{
+ bool str_bool;
+
*is_bool = 1;
if (!value)
return 1;
if (!*value)
return 0;
- if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on"))
- return 1;
- if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
- return 0;
+
+ if (convert_str_to_bool(value, &str_bool) == 0)
+ return str_bool ? 1 : 0;
*is_bool = 0;
return perf_config_int(name, value);
}
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 47b1e36..55785d5 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -695,3 +695,21 @@ fetch_kernel_version(unsigned int *puint, char *str,
*puint = (version << 16) + (patchlevel << 8) + sublevel;
return 0;
}
+
+int convert_str_to_bool(const char *str, bool *result)
+{
+ if (!result || !str)
+ return -EINVAL;
+
+ if (!strcasecmp(str, "true") || !strcasecmp(str, "yes") || !strcasecmp(str, "on")) {
+ *result = true;
+ return 0;
+ }
+
+ if (!strcasecmp(str, "false") || !strcasecmp(str, "no") || !strcasecmp(str, "off")) {
+ *result = false;
+ return 0;
+ }
+
+ return -EINVAL;
+}
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index dcc6590..be90932 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -358,4 +358,6 @@ int fetch_kernel_version(unsigned int *puint,
#define KVER_FMT "%d.%d.%d"
#define KVER_PARAM(x) KVER_VERSION(x), KVER_PATCHLEVEL(x), KVER_SUBLEVEL(x)
+int convert_str_to_bool(const char *str, bool *result);
+
#endif /* GIT_COMPAT_UTIL_H */
--
1.8.3.4
--
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