[PATCH v3 2/3] perf/sdt : List SDT events for a single file
This patch enables perf to look for SDT markers in a single file.
An individual file argument must be given to "perf list" to find out the SDT
markers
present in that file.
Usage is as below :
# perf list sdt /home/hemant/tmp
/home/hemant/tmp:
%user : foo
%user : bar
On using this command, perf looks for SDTs in that file using the ELF functions
from
the previous patch (in this series) and dumps them on stdout.
Signed-off-by : Hemant Kumar
---
tools/perf/Makefile.perf |1
tools/perf/builtin-list.c |2 +
tools/perf/util/parse-events.h |2 +
tools/perf/util/sdt.c | 113
4 files changed, 118 insertions(+)
create mode 100644 tools/perf/util/sdt.c
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 9670a16..e098dcd 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -373,6 +373,7 @@ LIB_OBJS += $(OUTPUT)util/stat.o
LIB_OBJS += $(OUTPUT)util/record.o
LIB_OBJS += $(OUTPUT)util/srcline.o
LIB_OBJS += $(OUTPUT)util/data.o
+LIB_OBJS += $(OUTPUT)util/sdt.o
LIB_OBJS += $(OUTPUT)ui/setup.o
LIB_OBJS += $(OUTPUT)ui/helpline.o
diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
index 011195e..98a8200 100644
--- a/tools/perf/builtin-list.c
+++ b/tools/perf/builtin-list.c
@@ -53,6 +53,8 @@ int cmd_list(int argc, const char **argv, const char *prefix
__maybe_unused)
print_hwcache_events(NULL, false);
else if (strcmp(argv[i], "pmu") == 0)
print_pmu_events(NULL, false);
+ else if (strcmp(argv[i], "sdt") == 0)
+ print_sdt_events(argv[++i]);
else if (strcmp(argv[i], "--raw-dump") == 0)
print_events(NULL, true);
else {
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index df094b4..fadc729 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -109,4 +109,6 @@ extern int is_valid_tracepoint(const char *event_string);
extern int valid_debugfs_mount(const char *debugfs);
+void print_sdt_events(const char *arg);
+
#endif /* __PERF_PARSE_EVENTS_H */
diff --git a/tools/perf/util/sdt.c b/tools/perf/util/sdt.c
new file mode 100644
index 000..91f0846
--- /dev/null
+++ b/tools/perf/util/sdt.c
@@ -0,0 +1,113 @@
+/*
+ * util/sdt.c
+ * This contains the relevant functions needed to find the SDT markers
+ * in a binary.
+ *
+ * TODOS:
+ * - Listing SDT events in most of the binaries present in the system.
+ * - Build a cache for these SDT events.
+ * - Looking into directories provided by the user for binaries with SDTs, etc.
+ */
+
+#include
+#include
+#include
+#include
+
+#include "parse-events.h"
+#include "linux/list.h"
+#include "symbol.h"
+
+
+/*
+ * get_sdt_note_info(): flush the SDT notes onto stdout
+ */
+static void get_sdt_note_info(struct list_head *start, const char *target)
+{
+ struct sdt_note *pos;
+
+ if (list_empty(start))
+ return;
+
+ printf("%s :\n", target);
+ list_for_each_entry(pos, start, note_list) {
+ printf("%%%s : %s\n", pos->provider, pos->name);
+ }
+}
+
+/*
+ * Error displayed in case of query of a
+ * single file for SDT markers
+ */
+static int sdt_err(int val, const char *target)
+{
+switch (-val) {
+case 0:
+break;
+case ENOENT:
+/* Absence of SDT markers */
+printf("%s : No SDT events found\n", target);
+break;
+case EBADF:
+printf("%s : Bad file name\n", target);
+break;
+default:
+printf("%s\n", strerror(val));
+}
+
+return val;
+}
+
+/*
+ * cleanup_sdt_note_list() : Free the sdt note list
+ */
+static void cleanup_sdt_note_list(struct list_head *sdt_notes)
+{
+struct sdt_note *tmp, *pos;
+
+if (list_empty(sdt_notes))
+return;
+
+list_for_each_entry_safe(pos, tmp, sdt_notes, note_list) {
+list_del(>note_list);
+free(pos->name);
+free(pos->provider);
+free(pos);
+}
+}
+
+/*
+ * filename__find_sdt() : looks for sdt markers and the list is
+ * stored in sdt_notes
+ */
+static int filename__find_sdt(const char *target)
+{
+ int ret;
+
+ LIST_HEAD(sdt_notes);
+
+ ret = get_sdt_note_list(_notes, target);
+ if (!ret)
+ get_sdt_note_info(_notes, target);
+ else
+ sdt_err(ret, target);
+
+ cleanup_sdt_note_list(_notes);
+
+ return ret;
+}
+
+/*
+ * print_sdt_notes() : wrapper function
+ */
+void print_sdt_events(const char *arg)
+{
+ if (arg) {
+ filename__find_sdt(arg);
+ return;
+ }
+
[PATCH v3 2/3] perf/sdt : List SDT events for a single file
This patch enables perf to look for SDT markers in a single file.
An individual file argument must be given to perf list to find out the SDT
markers
present in that file.
Usage is as below :
# perf list sdt /home/hemant/tmp
/home/hemant/tmp:
%user : foo
%user : bar
On using this command, perf looks for SDTs in that file using the ELF functions
from
the previous patch (in this series) and dumps them on stdout.
Signed-off-by : Hemant Kumar hem...@linux.vnet.ibm.com
---
tools/perf/Makefile.perf |1
tools/perf/builtin-list.c |2 +
tools/perf/util/parse-events.h |2 +
tools/perf/util/sdt.c | 113
4 files changed, 118 insertions(+)
create mode 100644 tools/perf/util/sdt.c
diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 9670a16..e098dcd 100644
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -373,6 +373,7 @@ LIB_OBJS += $(OUTPUT)util/stat.o
LIB_OBJS += $(OUTPUT)util/record.o
LIB_OBJS += $(OUTPUT)util/srcline.o
LIB_OBJS += $(OUTPUT)util/data.o
+LIB_OBJS += $(OUTPUT)util/sdt.o
LIB_OBJS += $(OUTPUT)ui/setup.o
LIB_OBJS += $(OUTPUT)ui/helpline.o
diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
index 011195e..98a8200 100644
--- a/tools/perf/builtin-list.c
+++ b/tools/perf/builtin-list.c
@@ -53,6 +53,8 @@ int cmd_list(int argc, const char **argv, const char *prefix
__maybe_unused)
print_hwcache_events(NULL, false);
else if (strcmp(argv[i], pmu) == 0)
print_pmu_events(NULL, false);
+ else if (strcmp(argv[i], sdt) == 0)
+ print_sdt_events(argv[++i]);
else if (strcmp(argv[i], --raw-dump) == 0)
print_events(NULL, true);
else {
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index df094b4..fadc729 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -109,4 +109,6 @@ extern int is_valid_tracepoint(const char *event_string);
extern int valid_debugfs_mount(const char *debugfs);
+void print_sdt_events(const char *arg);
+
#endif /* __PERF_PARSE_EVENTS_H */
diff --git a/tools/perf/util/sdt.c b/tools/perf/util/sdt.c
new file mode 100644
index 000..91f0846
--- /dev/null
+++ b/tools/perf/util/sdt.c
@@ -0,0 +1,113 @@
+/*
+ * util/sdt.c
+ * This contains the relevant functions needed to find the SDT markers
+ * in a binary.
+ *
+ * TODOS:
+ * - Listing SDT events in most of the binaries present in the system.
+ * - Build a cache for these SDT events.
+ * - Looking into directories provided by the user for binaries with SDTs, etc.
+ */
+
+#include stdio.h
+#include stdlib.h
+#include errno.h
+#include string.h
+
+#include parse-events.h
+#include linux/list.h
+#include symbol.h
+
+
+/*
+ * get_sdt_note_info(): flush the SDT notes onto stdout
+ */
+static void get_sdt_note_info(struct list_head *start, const char *target)
+{
+ struct sdt_note *pos;
+
+ if (list_empty(start))
+ return;
+
+ printf(%s :\n, target);
+ list_for_each_entry(pos, start, note_list) {
+ printf(%%%s : %s\n, pos-provider, pos-name);
+ }
+}
+
+/*
+ * Error displayed in case of query of a
+ * single file for SDT markers
+ */
+static int sdt_err(int val, const char *target)
+{
+switch (-val) {
+case 0:
+break;
+case ENOENT:
+/* Absence of SDT markers */
+printf(%s : No SDT events found\n, target);
+break;
+case EBADF:
+printf(%s : Bad file name\n, target);
+break;
+default:
+printf(%s\n, strerror(val));
+}
+
+return val;
+}
+
+/*
+ * cleanup_sdt_note_list() : Free the sdt note list
+ */
+static void cleanup_sdt_note_list(struct list_head *sdt_notes)
+{
+struct sdt_note *tmp, *pos;
+
+if (list_empty(sdt_notes))
+return;
+
+list_for_each_entry_safe(pos, tmp, sdt_notes, note_list) {
+list_del(pos-note_list);
+free(pos-name);
+free(pos-provider);
+free(pos);
+}
+}
+
+/*
+ * filename__find_sdt() : looks for sdt markers and the list is
+ * stored in sdt_notes
+ */
+static int filename__find_sdt(const char *target)
+{
+ int ret;
+
+ LIST_HEAD(sdt_notes);
+
+ ret = get_sdt_note_list(sdt_notes, target);
+ if (!ret)
+ get_sdt_note_info(sdt_notes, target);
+ else
+ sdt_err(ret, target);
+
+ cleanup_sdt_note_list(sdt_notes);
+
+ return ret;
+}
+
+/*
+ * print_sdt_notes() : wrapper function
+ */
+void print_sdt_events(const char *arg)
+{
+ if (arg) {
+ filename__find_sdt(arg);
+
