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perf script: Add not taken event for branch stack

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The branch stack has an existed field for printing mispredict, extend
the field for printing events and add support not-taken event.

Reviewed-by: Ian Rogers <irogers@google.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Link: https://lore.kernel.org/r/20250304111240.3378214-6-leo.yan@arm.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Leo Yan 2025-03-04 11:12:33 +00:00 • committed by Namhyung Kim
parent 4caa971050
commit 1e66dcff7b
2 changed files with 15 additions and 8 deletions
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20
tools/perf/builtin-script.c
View file

@ -935,19 +935,25 @@ static int perf_sample__fprintf_start(struct perf_script *script,
return printed;
}
static inline char
mispred_str(struct branch_entry *br)
static inline size_t
bstack_event_str(struct branch_entry *br, char *buf, size_t sz)
{
if (!(br->flags.mispred || br->flags.predicted))
return '-';
if (!(br->flags.mispred || br->flags.predicted || br->flags.not_taken))
return snprintf(buf, sz, "-");
return br->flags.predicted ? 'P' : 'M';
return snprintf(buf, sz, "%s%s",
br->flags.predicted ? "P" : "M",
br->flags.not_taken ? "N" : "");
}
static int print_bstack_flags(FILE *fp, struct branch_entry *br)
{
return fprintf(fp, "/%c/%c/%c/%d/%s/%s ",
mispred_str(br),
char events[16] = { 0 };
size_t pos;
pos = bstack_event_str(br, events, sizeof(events));
return fprintf(fp, "/%s/%c/%c/%d/%s/%s ",
pos < 0 ? "-" : events,
br->flags.in_tx ? 'X' : '-',
br->flags.abort ? 'A' : '-',
br->flags.cycles,

3
tools/perf/util/branch.h
View file

@ -25,7 +25,8 @@ struct branch_flags {
u64 spec:2;
u64 new_type:4;
u64 priv:3;
u64 reserved:31;
u64 not_taken:1;
u64 reserved:30;
};
};
};