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Date: Wed, 27 May 2015 05:19:59 +0000
From: Wang Nan <wangnan0@...wei.com>
To: <paulus@...ba.org>, <a.p.zijlstra@...llo.nl>, <mingo@...hat.com>,
<acme@...nel.org>, <namhyung@...nel.org>, <jolsa@...nel.org>,
<dsahern@...il.com>, <daniel@...earbox.net>,
<brendan.d.gregg@...il.com>, <masami.hiramatsu.pt@...achi.com>
CC: <lizefan@...wei.com>, <linux-kernel@...r.kernel.org>,
<pi3orama@....com>
Subject: [RFC PATCH v4 24/29] perf record: Enable passing bpf object file to --event
By introducing new rules in tools/perf/util/parse-events.[ly], this
patch enables 'perf record --event bpf_file.o' to select events by
an eBPF object file. It calls parse_events_load_bpf() to load that
file, which uses bpf__prepare_load() and finally calls
bpf_object__open() for the object files.
Instead of introducing evsel to evlist during parsing, events
selected by eBPF object files are appended separately. The reason
is:
1. During parsing, the probing points have not been initialized.
2. Currently we are unable to call add_perf_probe_events() twice,
therefore we have to wait until all such events are collected,
then probe all points by one call.
The real probing and selecting is reside in following patches.
Signed-off-by: Wang Nan <wangnan0@...wei.com>
---
tools/perf/util/Build | 1 +
tools/perf/util/bpf-loader.c | 60 ++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/bpf-loader.h | 11 ++++++++
tools/perf/util/debug.c | 5 ++++
tools/perf/util/debug.h | 1 +
tools/perf/util/parse-events.c | 16 +++++++++++
tools/perf/util/parse-events.h | 2 ++
tools/perf/util/parse-events.l | 5 +++-
tools/perf/util/parse-events.y | 18 ++++++++++++-
9 files changed, 117 insertions(+), 2 deletions(-)
create mode 100644 tools/perf/util/bpf-loader.c
create mode 100644 tools/perf/util/bpf-loader.h
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 797490a..609f6d6 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -75,6 +75,7 @@ libperf-$(CONFIG_X86) += tsc.o
libperf-y += cloexec.o
libperf-y += thread-stack.o
+libperf-$(CONFIG_LIBELF) += bpf-loader.o
libperf-$(CONFIG_LIBELF) += symbol-elf.o
libperf-$(CONFIG_LIBELF) += probe-event.o
diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
new file mode 100644
index 0000000..eef15f3
--- /dev/null
+++ b/tools/perf/util/bpf-loader.c
@@ -0,0 +1,60 @@
+/*
+ * bpf-loader.c
+ *
+ * Copyright (C) 2015 Wang Nan <wangnan0@...wei.com>
+ * Copyright (C) 2015 Huawei Inc.
+ */
+
+#include <bpf/libbpf.h>
+#include "perf.h"
+#include "debug.h"
+#include "bpf-loader.h"
+
+#define DEFINE_PRINT_FN(name, level) \
+static int libbpf_##name(const char *fmt, ...) \
+{ \
+ va_list args; \
+ int ret; \
+ \
+ va_start(args, fmt); \
+ ret = veprintf(level, verbose, pr_fmt(fmt), args);\
+ va_end(args); \
+ return ret; \
+}
+
+DEFINE_PRINT_FN(warning, 0)
+DEFINE_PRINT_FN(info, 0)
+DEFINE_PRINT_FN(debug, 1)
+
+static bool libbpf_initialized = false;
+
+int bpf__prepare_load(const char *filename)
+{
+ struct bpf_object *obj;
+
+ if (!libbpf_initialized)
+ libbpf_set_print(libbpf_warning,
+ libbpf_info,
+ libbpf_debug);
+
+ obj = bpf_object__open(filename);
+ if (!obj) {
+ pr_err("bpf: failed to load %s\n", filename);
+ return -EINVAL;
+ }
+
+ /*
+ * Throw object pointer away: it will be retrived using
+ * bpf_objects iterater.
+ */
+
+ return 0;
+}
+
+void bpf__clear(void)
+{
+ struct bpf_object *obj, *tmp;
+
+ bpf_object__for_each(obj, tmp)
+ bpf_object__close(obj);
+}
diff --git a/tools/perf/util/bpf-loader.h b/tools/perf/util/bpf-loader.h
new file mode 100644
index 0000000..d5c22da
--- /dev/null
+++ b/tools/perf/util/bpf-loader.h
@@ -0,0 +1,11 @@
+/*
+ * Copyright (C) 2015, Wang Nan <wangnan0@...wei.com>
+ * Copyright (C) 2015, Huawei Inc.
+ */
+#ifndef __BPF_LOADER_H
+#define __BPF_LOADER_H
+
+int bpf__prepare_load(const char *filename);
+
+void bpf__clear(void);
+#endif
diff --git a/tools/perf/util/debug.c b/tools/perf/util/debug.c
index 2da5581..86d9c73 100644
--- a/tools/perf/util/debug.c
+++ b/tools/perf/util/debug.c
@@ -36,6 +36,11 @@ static int _eprintf(int level, int var, const char *fmt, va_list args)
return ret;
}
+int veprintf(int level, int var, const char *fmt, va_list args)
+{
+ return _eprintf(level, var, fmt, args);
+}
+
int eprintf(int level, int var, const char *fmt, ...)
{
va_list args;
diff --git a/tools/perf/util/debug.h b/tools/perf/util/debug.h
index caac2fd..8b9a088 100644
--- a/tools/perf/util/debug.h
+++ b/tools/perf/util/debug.h
@@ -50,6 +50,7 @@ void pr_stat(const char *fmt, ...);
int eprintf(int level, int var, const char *fmt, ...) __attribute__((format(printf, 3, 4)));
int eprintf_time(int level, int var, u64 t, const char *fmt, ...) __attribute__((format(printf, 4, 5)));
+int veprintf(int level, int var, const char *fmt, va_list args);
int perf_debug_option(const char *str);
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index be06553..6030ea3 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -17,6 +17,7 @@
#include "parse-events-flex.h"
#include "pmu.h"
#include "thread_map.h"
+#include "bpf-loader.h"
#define MAX_NAME_LEN 100
@@ -471,6 +472,21 @@ int parse_events_add_tracepoint(struct list_head *list, int *idx,
return add_tracepoint_event(list, idx, sys, event);
}
+int parse_events_load_bpf(struct list_head *list __maybe_unused,
+ int *idx __maybe_unused,
+ char *bpf_file_name)
+{
+ /*
+ * Currently don't link any event to list. BPF object files
+ * should be saved to a seprated list and processed together.
+ *
+ * Things could be changed if we solve perf probe reentering
+ * problem. After that probe events file by file is possible.
+ * However, probing cost is still need to be considered.
+ */
+ return bpf__prepare_load(bpf_file_name);
+}
+
static int
parse_breakpoint_type(const char *type, struct perf_event_attr *attr)
{
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index 52a2dda..a8a0f01 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -99,6 +99,8 @@ int parse_events__modifier_group(struct list_head *list, char *event_mod);
int parse_events_name(struct list_head *list, char *name);
int parse_events_add_tracepoint(struct list_head *list, int *idx,
char *sys, char *event);
+int parse_events_load_bpf(struct list_head *list, int *idx,
+ char *bpf_file_name);
int parse_events_add_numeric(struct list_head *list, int *idx,
u32 type, u64 config,
struct list_head *head_config);
diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index 8895cf3..a35cd4d 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -94,6 +94,7 @@ static int term(yyscan_t scanner, int type)
group [^,{}/]*[{][^}]*[}][^,{}/]*
event_pmu [^,{}/]+[/][^/]*[/][^,{}/]*
event [^,{}/]+
+bpf_file .*\.(o|bpf)
num_dec [0-9]+
num_hex 0x[a-fA-F0-9]+
@@ -131,7 +132,8 @@ modifier_bp [rwx]{1,3}
}
{event_pmu} |
-{event} {
+{event} |
+{bpf_file} {
str(yyscanner, PE_EVENT_NAME);
BEGIN(INITIAL); yyless(0);
return PE_EVENT_NAME;
@@ -229,6 +231,7 @@ r{num_raw_hex} { return raw(yyscanner); }
{modifier_event} { return str(yyscanner, PE_MODIFIER_EVENT); }
{name} { return pmu_str_check(yyscanner); }
+{bpf_file} { return str(yyscanner, PE_BPF_FILE); }
"/" { BEGIN(config); return '/'; }
- { return '-'; }
, { BEGIN(event); return ','; }
diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index 72def07..e9c4861 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -43,6 +43,7 @@ static inc_group_count(struct list_head *list,
%token PE_VALUE PE_VALUE_SYM_HW PE_VALUE_SYM_SW PE_RAW PE_TERM
%token PE_EVENT_NAME
%token PE_NAME
+%token PE_BPF_FILE
%token PE_MODIFIER_EVENT PE_MODIFIER_BP
%token PE_NAME_CACHE_TYPE PE_NAME_CACHE_OP_RESULT
%token PE_PREFIX_MEM PE_PREFIX_RAW PE_PREFIX_GROUP
@@ -54,6 +55,7 @@ static inc_group_count(struct list_head *list,
%type <num> PE_RAW
%type <num> PE_TERM
%type <str> PE_NAME
+%type <str> PE_BPF_FILE
%type <str> PE_NAME_CACHE_TYPE
%type <str> PE_NAME_CACHE_OP_RESULT
%type <str> PE_MODIFIER_EVENT
@@ -70,6 +72,7 @@ static inc_group_count(struct list_head *list,
%type <head> event_legacy_tracepoint
%type <head> event_legacy_numeric
%type <head> event_legacy_raw
+%type <head> event_bpf_file
%type <head> event_def
%type <head> event_mod
%type <head> event_name
@@ -199,7 +202,8 @@ event_def: event_pmu |
event_legacy_mem |
event_legacy_tracepoint sep_dc |
event_legacy_numeric sep_dc |
- event_legacy_raw sep_dc
+ event_legacy_raw sep_dc |
+ event_bpf_file
event_pmu:
PE_NAME '/' event_config '/'
@@ -416,6 +420,18 @@ PE_RAW
$$ = list;
}
+event_bpf_file:
+PE_BPF_FILE
+{
+ struct parse_events_evlist *data = _data;
+ struct list_head *list;
+
+ ALLOC_LIST(list);
+ ABORT_ON(parse_events_load_bpf(list, &data->idx, $1));
+ $$ = list;
+}
+
+
start_terms: event_config
{
struct parse_events_terms *data = _data;
--
1.8.3.4
--
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