perf annotate: Record the min/max cycles

Currently perf has a feature to account cycles for LBRs

For example, on skylake:

  perf record -b ...
  perf report or perf annotate

And then browsing the annotate browser gives average cycle counts for
program blocks.

For some analysis it would be useful if we could know not only the
average cycles but also the min and max cycles.

This patch records the min and max cycles.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1526569118-14217-2-git-send-email-yao.jin@linux.intel.com
[ Switch from max/min to min/max ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 5d74a30..4fcfefe 100644 (file)
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -760,6 +760,15 @@ static int __symbol__account_cycles(struct annotation *notes,
        ch[offset].num_aggr++;
        ch[offset].cycles_aggr += cycles;
 
+       if (cycles > ch[offset].cycles_max)
+               ch[offset].cycles_max = cycles;
+
+       if (ch[offset].cycles_min) {
+               if (cycles && cycles < ch[offset].cycles_min)
+                       ch[offset].cycles_min = cycles;
+       } else
+               ch[offset].cycles_min = cycles;
+
        if (!have_start && ch[offset].have_start)
                return 0;
        if (ch[offset].num) {
@@ -953,8 +962,11 @@ void annotation__compute_ipc(struct annotation *notes, size_t size)
                        if (ch->have_start)
                                annotation__count_and_fill(notes, ch->start, offset, ch);
                        al = notes->offsets[offset];
-                       if (al && ch->num_aggr)
+                       if (al && ch->num_aggr) {
                                al->cycles = ch->cycles_aggr / ch->num_aggr;
+                               al->cycles_max = ch->cycles_max;
+                               al->cycles_min = ch->cycles_min;
+                       }
                        notes->have_cycles = true;
                }
        }

diff --git a/tools/perf/util/annotate.h b/tools/perf/util/annotate.h
index f28a9e4..d50363d 100644 (file)
--- a/tools/perf/util/annotate.h
+++ b/tools/perf/util/annotate.h
@@ -105,6 +105,8 @@ struct annotation_line {
        int                      jump_sources;
        float                    ipc;
        u64                      cycles;
+       u64                      cycles_max;
+       u64                      cycles_min;
        size_t                   privsize;
        char                    *path;
        u32                      idx;
@@ -186,6 +188,8 @@ struct cyc_hist {
        u64     start;
        u64     cycles;
        u64     cycles_aggr;
+       u64     cycles_max;
+       u64     cycles_min;
        u32     num;
        u32     num_aggr;
        u8      have_start;