[PATCH 9/9] perf, tools: Add tools support for cycles, weight branch_info field

Andi Kleen
2015-05-07T22:56:49Z

cycles is a new branch_info field available on some CPUs
that indicates the time deltas between branches in the LBR.

Add a sort key and output code for the cycles
to allow to display the basic block cycles individually in perf report.

We also pass in the cycles for weight when LBRs are processed,
which allows to get global and local weight to get averages.

And also print the cycles information for perf report -D.
I also added printing for the previously missing LBR flags
(mispredict etc.)

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
tools/perf/Documentation/perf-report.txt | 1 +
tools/perf/util/event.h | 3 ++-
tools/perf/util/hist.c | 3 ++-
tools/perf/util/hist.h | 1 +
tools/perf/util/session.c | 16 ++++++++++++----
tools/perf/util/sort.c | 24 ++++++++++++++++++++++++
tools/perf/util/sort.h | 1 +
7 files changed, 43 insertions(+), 6 deletions(-)

diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index 27190ed..034a2b4 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -108,6 +108,7 @@ OPTIONS
- mispredict: "N" for predicted branch, "Y" for mispredicted branch
- in_tx: branch in TSX transaction
- abort: TSX transaction abort.
+ - cycles: Cycles in basic block

And default sort keys are changed to comm, dso_from, symbol_from, dso_to
and symbol_to, see '--branch-stack'.
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 7eecd5e..f028a3c 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -129,7 +129,8 @@ struct branch_flags {
u64 predicted:1;
u64 in_tx:1;
u64 abort:1;
- u64 reserved:60;
+ u64 cycles:16;
+ u64 reserved:44;
};

struct branch_entry {
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 3387706..302fc05 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -623,7 +623,8 @@ iter_add_next_branch_entry(struct hist_entry_iter *iter, struct addr_location *a
* and not events sampled. Thus we use a pseudo period of 1.
*/
he = __hists__add_entry(hists, al, iter->parent, &bi[i], NULL,
- 1, 1, 0, true);
+ 1, bi->flags.cycles ? bi->flags.cycles : 1,
+ 0, true);
if (he == NULL)
return -ENOMEM;

diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 9f31b89..b55c904 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -47,6 +47,7 @@ enum hist_column {
HISTC_MEM_SNOOP,
HISTC_MEM_DCACHELINE,
HISTC_TRANSACTION,
+ HISTC_CYCLES,
HISTC_NR_COLS, /* Last entry */
};

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index e722107..484b974 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -738,10 +738,18 @@ static void branch_stack__printf(struct perf_sample *sample)

printf("... branch stack: nr:%" PRIu64 "\n", sample->branch_stack->nr);

- for (i = 0; i < sample->branch_stack->nr; i++)
- printf("..... %2"PRIu64": %016" PRIx64 " -> %016" PRIx64 "\n",
- i, sample->branch_stack->entries[i].from,
- sample->branch_stack->entries[i].to);
+ for (i = 0; i < sample->branch_stack->nr; i++) {
+ struct branch_entry *e = &sample->branch_stack->entries[i];
+
+ printf("..... %2"PRIu64": %016" PRIx64 " -> %016" PRIx64 " %hu cycles %s%s%s%s %x\n",
+ i, e->from, e->to,
+ e->flags.cycles,
+ e->flags.mispred ? "M" : " ",
+ e->flags.predicted ? "P" : " ",
+ e->flags.abort ? "A" : " ",
+ e->flags.in_tx ? "T" : " ",
+ (unsigned)e->flags.reserved);
+ }
}

static void regs_dump__printf(u64 mask, u64 *regs)
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 4593f36..03d8e6e 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -528,6 +528,29 @@ static int hist_entry__mispredict_snprintf(struct hist_entry *he, char *bf,
return repsep_snprintf(bf, size, "%-*.*s", width, width, out);
}

+static int64_t
+sort__cycles_cmp(struct hist_entry *left, struct hist_entry *right)
+{
+ return left->branch_info->flags.cycles -
+ right->branch_info->flags.cycles;
+}
+
+static int hist_entry__cycles_snprintf(struct hist_entry *he, char *bf,
+ size_t size, unsigned int width)
+{
+ if (he->branch_info->flags.cycles == 0)
+ return repsep_snprintf(bf, size, "%-*s", width, "-");
+ return repsep_snprintf(bf, size, "%-*hd", width,
+ he->branch_info->flags.cycles);
+}
+
+struct sort_entry sort_cycles = {
+ .se_header = "Basic Block Cycles",
+ .se_cmp = sort__cycles_cmp,
+ .se_snprintf = hist_entry__cycles_snprintf,
+ .se_width_idx = HISTC_CYCLES,
+};
+
/* --sort daddr_sym */
static int64_t
sort__daddr_cmp(struct hist_entry *left, struct hist_entry *right)
@@ -1192,6 +1215,7 @@ static struct sort_dimension bstack_sort_dimensions[] = {
DIM(SORT_MISPREDICT, "mispredict", sort_mispredict),
DIM(SORT_IN_TX, "in_tx", sort_in_tx),
DIM(SORT_ABORT, "abort", sort_abort),
+ DIM(SORT_CYCLES, "cycles", sort_cycles),
};

#undef DIM
diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
index e97cd47..bc6c87a 100644
--- a/tools/perf/util/sort.h
+++ b/tools/perf/util/sort.h
@@ -185,6 +185,7 @@ enum sort_type {
SORT_MISPREDICT,
SORT_ABORT,
SORT_IN_TX,
+ SORT_CYCLES,

/* memory mode specific sort keys */
__SORT_MEMORY_MODE,
--
1.9.3