mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-23 19:11:51 +00:00
cedd3614e5
This expands generic branch type classification by adding two more entries there in i.e irq and exception return. Also updates the x86 implementation to process X86_BR_IRET and X86_BR_IRQ records as appropriate. This changes branch types reported to user space on x86 platform but it should not be a problem. The possible scenarios and impacts are enumerated here. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/1645681014-3346-1-git-send-email-anshuman.khandual@arm.com
148 lines
2.9 KiB
C
148 lines
2.9 KiB
C
#include "util/map_symbol.h"
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#include "util/branch.h"
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#include <linux/kernel.h>
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static bool cross_area(u64 addr1, u64 addr2, int size)
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{
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u64 align1, align2;
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align1 = addr1 & ~(size - 1);
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align2 = addr2 & ~(size - 1);
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return (align1 != align2) ? true : false;
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}
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#define AREA_4K 4096
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#define AREA_2M (2 * 1024 * 1024)
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void branch_type_count(struct branch_type_stat *st, struct branch_flags *flags,
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u64 from, u64 to)
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{
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if (flags->type == PERF_BR_UNKNOWN || from == 0)
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return;
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st->counts[flags->type]++;
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if (flags->type == PERF_BR_COND) {
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if (to > from)
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st->cond_fwd++;
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else
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st->cond_bwd++;
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}
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if (cross_area(from, to, AREA_2M))
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st->cross_2m++;
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else if (cross_area(from, to, AREA_4K))
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st->cross_4k++;
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}
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const char *branch_type_name(int type)
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{
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const char *branch_names[PERF_BR_MAX] = {
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"N/A",
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"COND",
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"UNCOND",
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"IND",
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"CALL",
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"IND_CALL",
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"RET",
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"SYSCALL",
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"SYSRET",
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"COND_CALL",
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"COND_RET",
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"ERET",
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"IRQ"
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};
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if (type >= 0 && type < PERF_BR_MAX)
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return branch_names[type];
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return NULL;
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}
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void branch_type_stat_display(FILE *fp, struct branch_type_stat *st)
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{
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u64 total = 0;
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int i;
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for (i = 0; i < PERF_BR_MAX; i++)
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total += st->counts[i];
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if (total == 0)
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return;
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fprintf(fp, "\n#");
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fprintf(fp, "\n# Branch Statistics:");
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fprintf(fp, "\n#");
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if (st->cond_fwd > 0) {
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fprintf(fp, "\n%8s: %5.1f%%",
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"COND_FWD",
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100.0 * (double)st->cond_fwd / (double)total);
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}
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if (st->cond_bwd > 0) {
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fprintf(fp, "\n%8s: %5.1f%%",
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"COND_BWD",
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100.0 * (double)st->cond_bwd / (double)total);
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}
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if (st->cross_4k > 0) {
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fprintf(fp, "\n%8s: %5.1f%%",
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"CROSS_4K",
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100.0 * (double)st->cross_4k / (double)total);
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}
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if (st->cross_2m > 0) {
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fprintf(fp, "\n%8s: %5.1f%%",
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"CROSS_2M",
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100.0 * (double)st->cross_2m / (double)total);
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}
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for (i = 0; i < PERF_BR_MAX; i++) {
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if (st->counts[i] > 0)
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fprintf(fp, "\n%8s: %5.1f%%",
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branch_type_name(i),
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100.0 *
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(double)st->counts[i] / (double)total);
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}
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}
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static int count_str_scnprintf(int idx, const char *str, char *bf, int size)
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{
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return scnprintf(bf, size, "%s%s", (idx) ? " " : " (", str);
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}
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int branch_type_str(struct branch_type_stat *st, char *bf, int size)
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{
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int i, j = 0, printed = 0;
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u64 total = 0;
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for (i = 0; i < PERF_BR_MAX; i++)
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total += st->counts[i];
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if (total == 0)
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return 0;
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if (st->cond_fwd > 0)
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printed += count_str_scnprintf(j++, "COND_FWD", bf + printed, size - printed);
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if (st->cond_bwd > 0)
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printed += count_str_scnprintf(j++, "COND_BWD", bf + printed, size - printed);
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for (i = 0; i < PERF_BR_MAX; i++) {
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if (i == PERF_BR_COND)
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continue;
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if (st->counts[i] > 0)
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printed += count_str_scnprintf(j++, branch_type_name(i), bf + printed, size - printed);
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}
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if (st->cross_4k > 0)
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printed += count_str_scnprintf(j++, "CROSS_4K", bf + printed, size - printed);
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if (st->cross_2m > 0)
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printed += count_str_scnprintf(j++, "CROSS_2M", bf + printed, size - printed);
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return printed;
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}
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