[PATCH v5 5/7] perf util: Create branch.c/.h for common branch functions

Jin Yao
2017-04-19T07:51:27Z

Create new util/branch.c and util/branch.h to contain the common
branch functions. Such as:

branch_type_count(): Count the numbers of branch types
branch_type_name() : Return the name of branch type

The branch type is saved in branch_flags.

Change log
----------

v5: It's a new patch in v5 patch series.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
tools/perf/util/Build | 1 +
tools/perf/util/branch.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/branch.h | 23 ++++++++++++++++++
tools/perf/util/event.h | 3 ++-
4 files changed, 89 insertions(+), 1 deletion(-)
create mode 100644 tools/perf/util/branch.c
create mode 100644 tools/perf/util/branch.h

diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index 5c0ea11..40e318c 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -90,6 +90,7 @@ libperf-y += vsprintf.o
libperf-y += drv_configs.o
libperf-y += time-utils.o
libperf-y += expr-bison.o
+libperf-y += branch.o

libperf-$(CONFIG_LIBBPF) += bpf-loader.o
libperf-$(CONFIG_BPF_PROLOGUE) += bpf-prologue.o
diff --git a/tools/perf/util/branch.c b/tools/perf/util/branch.c
new file mode 100644
index 0000000..702e376
--- /dev/null
+++ b/tools/perf/util/branch.c
@@ -0,0 +1,63 @@
+#include "perf.h"
+#include "util/util.h"
+#include "util/debug.h"
+#include "util/branch.h"
+
+static bool cross_area(u64 addr1, u64 addr2, int size)
+{
+ u64 align1, align2;
+
+ align1 = addr1 & ~(size - 1);
+ align2 = addr2 & ~(size - 1);
+
+ return (align1 != align2) ? true : false;
+}
+
+#define AREA_4K 4096
+#define AREA_2M (2 * 1024 * 1024)
+
+void branch_type_count(struct branch_type_stat *stat,
+ struct branch_flags *flags,
+ u64 from, u64 to)
+{
+ if (flags->type == PERF_BR_NONE || from == 0)
+ return;
+
+ stat->counts[flags->type]++;
+
+ if (flags->type == PERF_BR_JCC) {
+ if (to > from)
+ stat->jcc_fwd++;
+ else
+ stat->jcc_bwd++;
+ }
+
+ if (cross_area(from, to, AREA_2M))
+ stat->cross_2m++;
+ else if (cross_area(from, to, AREA_4K))
+ stat->cross_4k++;
+}
+
+const char *branch_type_name(int type)
+{
+ const char *branch_names[PERF_BR_MAX] = {
+ "N/A",
+ "JCC",
+ "JMP",
+ "IND_JMP",
+ "CALL",
+ "IND_CALL",
+ "RET",
+ "SYSCALL",
+ "SYSRET",
+ "IRQ",
+ "INT",
+ "IRET",
+ "FAR_BRANCH",
+ };
+
+ if (type >= 0 && type < PERF_BR_MAX)
+ return branch_names[type];
+
+ return NULL;
+}
diff --git a/tools/perf/util/branch.h b/tools/perf/util/branch.h
new file mode 100644
index 0000000..26c8da6
--- /dev/null
+++ b/tools/perf/util/branch.h
@@ -0,0 +1,23 @@
+#ifndef _PERF_BRANCH_H
+#define _PERF_BRANCH_H 1
+
+#include <stdint.h>
+#include "../perf.h"
+
+struct branch_type_stat {
+ u64 counts[PERF_BR_MAX];
+ u64 jcc_fwd;
+ u64 jcc_bwd;
+ u64 cross_4k;
+ u64 cross_2m;
+};
+
+struct branch_flags;
+
+void branch_type_count(struct branch_type_stat *stat,
+ struct branch_flags *flags,
+ u64 from, u64 to);
+
+const char *branch_type_name(int type);
+
+#endif /* _PERF_BRANCH_H */
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index eb7a7b2..26b4c2e 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -142,7 +142,8 @@ struct branch_flags {
u64 in_tx:1;
u64 abort:1;
u64 cycles:16;
- u64 reserved:44;
+ u64 type:4;
+ u64 reserved:40;
};

struct branch_entry {
--
2.7.4