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Subject[PATCH v6 5/7] perf util: Create branch.c/.h for common branch functions
Date
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
branch_type_stat_display(): Display branch type statistics info
branch_type_str(): Construct the branch type string.

The branch type is saved in branch_flags.

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

v6: Move that multiline conditional code inside {} brackets.
Move branch_type_stat_display() from builtin-report.c to
branch.c.
Move branch_type_str() from callchain.c to branch.c.

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 | 168 +++++++++++++++++++++++++++++++++++++++++++++++
tools/perf/util/branch.h | 25 +++++++
tools/perf/util/event.h | 3 +-
4 files changed, 196 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 f0b9e5d..391bf85 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -91,6 +91,7 @@ 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..4aa56ad
--- /dev/null
+++ b/tools/perf/util/branch.c
@@ -0,0 +1,168 @@
+#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;
+}
+
+void branch_type_stat_display(FILE *fp, struct branch_type_stat *stat)
+{
+ u64 total = 0;
+ int i;
+
+ for (i = 0; i < PERF_BR_MAX; i++)
+ total += stat->counts[i];
+
+ if (total == 0)
+ return;
+
+ fprintf(fp, "\n#");
+ fprintf(fp, "\n# Branch Statistics:");
+ fprintf(fp, "\n#");
+
+ if (stat->jcc_fwd > 0) {
+ fprintf(fp, "\n%12s: %5.1f%%",
+ "JCC forward",
+ 100.0 * (double)stat->jcc_fwd / (double)total);
+ }
+
+ if (stat->jcc_bwd > 0) {
+ fprintf(fp, "\n%12s: %5.1f%%",
+ "JCC backward",
+ 100.0 * (double)stat->jcc_bwd / (double)total);
+ }
+
+ if (stat->cross_4k > 0) {
+ fprintf(fp, "\n%12s: %5.1f%%",
+ "CROSS_4K",
+ 100.0 * (double)stat->cross_4k / (double)total);
+ }
+
+ if (stat->cross_2m > 0) {
+ fprintf(fp, "\n%12s: %5.1f%%",
+ "CROSS_2M",
+ 100.0 * (double)stat->cross_2m / (double)total);
+ }
+
+ for (i = 0; i < PERF_BR_MAX; i++) {
+ if (stat->counts[i] > 0)
+ fprintf(fp, "\n%12s: %5.1f%%",
+ branch_type_name(i),
+ 100.0 *
+ (double)stat->counts[i] / (double)total);
+ }
+}
+
+static int count_str_printf(int index, const char *str,
+ char *bf, int bfsize)
+{
+ int printed;
+
+ printed = scnprintf(bf, bfsize,
+ "%s%s",
+ (index) ? " " : " (", str);
+
+ return printed;
+}
+
+int branch_type_str(struct branch_type_stat *stat,
+ char *bf, int bfsize)
+{
+ int i, j = 0, printed = 0;
+ u64 total = 0;
+
+ for (i = 0; i < PERF_BR_MAX; i++)
+ total += stat->counts[i];
+
+ if (total == 0)
+ return 0;
+
+ if (stat->jcc_fwd > 0) {
+ printed += count_str_printf(j++, "JCC forward",
+ bf + printed, bfsize - printed);
+ }
+
+ if (stat->jcc_bwd > 0) {
+ printed += count_str_printf(j++, "JCC backward",
+ bf + printed, bfsize - printed);
+ }
+
+ for (i = 0; i < PERF_BR_MAX; i++) {
+ if (i == PERF_BR_JCC)
+ continue;
+
+ if (stat->counts[i] > 0) {
+ printed += count_str_printf(j++, branch_type_name(i),
+ bf + printed, bfsize - printed);
+ }
+ }
+
+ if (stat->cross_4k > 0) {
+ printed += count_str_printf(j++, "CROSS_4K",
+ bf + printed, bfsize - printed);
+ }
+
+ if (stat->cross_2m > 0) {
+ printed += count_str_printf(j++, "CROSS_2M",
+ bf + printed, bfsize - printed);
+ }
+
+ return printed;
+}
diff --git a/tools/perf/util/branch.h b/tools/perf/util/branch.h
new file mode 100644
index 0000000..4fb3d50
--- /dev/null
+++ b/tools/perf/util/branch.h
@@ -0,0 +1,25 @@
+#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);
+void branch_type_stat_display(FILE *fp, struct branch_type_stat *stat);
+int branch_type_str(struct branch_type_stat *stat, char *bf, int bfsize);
+
+#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
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