branch.c
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#include "util/map_symbol.h"
#include "util/branch.h"
#include <linux/kernel.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 *st, struct branch_flags *flags,
u64 from, u64 to)
{
if (flags->type == PERF_BR_UNKNOWN || from == 0)
return;
st->counts[flags->type]++;
if (flags->type == PERF_BR_COND) {
if (to > from)
st->cond_fwd++;
else
st->cond_bwd++;
}
if (cross_area(from, to, AREA_2M))
st->cross_2m++;
else if (cross_area(from, to, AREA_4K))
st->cross_4k++;
}
const char *branch_type_name(int type)
{
const char *branch_names[PERF_BR_MAX] = {
"N/A",
"COND",
"UNCOND",
"IND",
"CALL",
"IND_CALL",
"RET",
"SYSCALL",
"SYSRET",
"COND_CALL",
"COND_RET"
};
if (type >= 0 && type < PERF_BR_MAX)
return branch_names[type];
return NULL;
}
void branch_type_stat_display(FILE *fp, struct branch_type_stat *st)
{
u64 total = 0;
int i;
for (i = 0; i < PERF_BR_MAX; i++)
total += st->counts[i];
if (total == 0)
return;
fprintf(fp, "\n#");
fprintf(fp, "\n# Branch Statistics:");
fprintf(fp, "\n#");
if (st->cond_fwd > 0) {
fprintf(fp, "\n%8s: %5.1f%%",
"COND_FWD",
100.0 * (double)st->cond_fwd / (double)total);
}
if (st->cond_bwd > 0) {
fprintf(fp, "\n%8s: %5.1f%%",
"COND_BWD",
100.0 * (double)st->cond_bwd / (double)total);
}
if (st->cross_4k > 0) {
fprintf(fp, "\n%8s: %5.1f%%",
"CROSS_4K",
100.0 * (double)st->cross_4k / (double)total);
}
if (st->cross_2m > 0) {
fprintf(fp, "\n%8s: %5.1f%%",
"CROSS_2M",
100.0 * (double)st->cross_2m / (double)total);
}
for (i = 0; i < PERF_BR_MAX; i++) {
if (st->counts[i] > 0)
fprintf(fp, "\n%8s: %5.1f%%",
branch_type_name(i),
100.0 *
(double)st->counts[i] / (double)total);
}
}
static int count_str_scnprintf(int idx, const char *str, char *bf, int size)
{
return scnprintf(bf, size, "%s%s", (idx) ? " " : " (", str);
}
int branch_type_str(struct branch_type_stat *st, char *bf, int size)
{
int i, j = 0, printed = 0;
u64 total = 0;
for (i = 0; i < PERF_BR_MAX; i++)
total += st->counts[i];
if (total == 0)
return 0;
if (st->cond_fwd > 0)
printed += count_str_scnprintf(j++, "COND_FWD", bf + printed, size - printed);
if (st->cond_bwd > 0)
printed += count_str_scnprintf(j++, "COND_BWD", bf + printed, size - printed);
for (i = 0; i < PERF_BR_MAX; i++) {
if (i == PERF_BR_COND)
continue;
if (st->counts[i] > 0)
printed += count_str_scnprintf(j++, branch_type_name(i), bf + printed, size - printed);
}
if (st->cross_4k > 0)
printed += count_str_scnprintf(j++, "CROSS_4K", bf + printed, size - printed);
if (st->cross_2m > 0)
printed += count_str_scnprintf(j++, "CROSS_2M", bf + printed, size - printed);
return printed;
}