perf diff: Add ratio computation way to compare hist entries

[deliverable/linux.git] / tools / perf / builtin-diff.c

diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 1063c31e507c52243ee6681d3442a85eb012e940..e90c06aea4d42952445084282774bfbb8435c7ca 100644 (file)
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -26,6 +26,41 @@ static bool  force;
 static bool show_displacement;
 static bool show_baseline_only;
 
+enum {
+       COMPUTE_DELTA,
+       COMPUTE_RATIO,
+       COMPUTE_MAX,
+};
+
+const char *compute_names[COMPUTE_MAX] = {
+       [COMPUTE_DELTA] = "delta",
+       [COMPUTE_RATIO] = "ratio",
+};
+
+static int compute;
+
+static int setup_compute(const struct option *opt, const char *str,
+                        int unset __maybe_unused)
+{
+       int *cp = (int *) opt->value;
+       unsigned i;
+
+       if (!str) {
+               *cp = COMPUTE_DELTA;
+               return 0;
+       }
+
+       for (i = 0; i < COMPUTE_MAX; i++)
+               if (!strcmp(str, compute_names[i])) {
+                       *cp = i;
+                       return 0;
+               }
+
+       pr_err("Failed: '%s' is not computation method "
+              "(use 'delta' or 'ratio').\n", str);
+       return -EINVAL;
+}
+
 static int hists__add_entry(struct hists *self,
                            struct addr_location *al, u64 period)
 {
@@ -262,6 +297,9 @@ static const struct option options[] = {
                    "Show position displacement relative to baseline"),
        OPT_BOOLEAN('b', "baseline-only", &show_baseline_only,
                    "Show only items with match in baseline"),
+       OPT_CALLBACK('c', "compute", &compute, "delta,ratio (default delta)",
+                    "Entries differential computation selection",
+                    setup_compute),
        OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
                    "dump raw trace in ASCII"),
        OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
@@ -290,9 +328,19 @@ static void ui_init(void)
        /* No overhead column. */
        perf_hpp__column_enable(PERF_HPP__OVERHEAD, false);
 
-       /* Display baseline/delta/displacement columns. */
+       /* Display baseline/delta/ratio/displacement columns. */
        perf_hpp__column_enable(PERF_HPP__BASELINE, true);
-       perf_hpp__column_enable(PERF_HPP__DELTA, true);
+
+       switch (compute) {
+       case COMPUTE_DELTA:
+               perf_hpp__column_enable(PERF_HPP__DELTA, true);
+               break;
+       case COMPUTE_RATIO:
+               perf_hpp__column_enable(PERF_HPP__RATIO, true);
+               break;
+       default:
+               BUG_ON(1);
+       };
 
        if (show_displacement)
                perf_hpp__column_enable(PERF_HPP__DISPL, true);