perf diff: Change compute methods to work with pair directly

Changing compute methods to operate over hist entry and its pair
directly. This makes the code more obvious and readable, instead of all
time checking for pair being != NULL.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1354110769-2998-6-git-send-email-jolsa@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 9fbbc01c5ad70bd3444b093446a4c6f876c3bb12..342085a180760d956ea203482ebcc9c21595dd52 100644 (file)
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -146,47 +146,40 @@ static int setup_compute(const struct option *opt, const char *str,
        return -EINVAL;
 }
 
-static double get_period_percent(struct hist_entry *he, u64 period)
+double perf_diff__period_percent(struct hist_entry *he, u64 period)
 {
        u64 total = he->hists->stats.total_period;
        return (period * 100.0) / total;
 }
 
-double perf_diff__compute_delta(struct hist_entry *he)
+double perf_diff__compute_delta(struct hist_entry *he, struct hist_entry *pair)
 {
-       struct hist_entry *pair = hist_entry__next_pair(he);
-       double new_percent = get_period_percent(he, he->stat.period);
-       double old_percent = pair ? get_period_percent(pair, pair->stat.period) : 0.0;
+       double new_percent = perf_diff__period_percent(he, he->stat.period);
+       double old_percent = perf_diff__period_percent(pair, pair->stat.period);
 
        he->diff.period_ratio_delta = new_percent - old_percent;
        he->diff.computed = true;
        return he->diff.period_ratio_delta;
 }
 
-double perf_diff__compute_ratio(struct hist_entry *he)
+double perf_diff__compute_ratio(struct hist_entry *he, struct hist_entry *pair)
 {
-       struct hist_entry *pair = hist_entry__next_pair(he);
        double new_period = he->stat.period;
-       double old_period = pair ? pair->stat.period : 0;
+       double old_period = pair->stat.period;
 
        he->diff.computed = true;
-       he->diff.period_ratio = pair ? (new_period / old_period) : 0;
+       he->diff.period_ratio = new_period / old_period;
        return he->diff.period_ratio;
 }
 
-s64 perf_diff__compute_wdiff(struct hist_entry *he)
+s64 perf_diff__compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
 {
-       struct hist_entry *pair = hist_entry__next_pair(he);
        u64 new_period = he->stat.period;
-       u64 old_period = pair ? pair->stat.period : 0;
+       u64 old_period = pair->stat.period;
 
        he->diff.computed = true;
-
-       if (!pair)
-               he->diff.wdiff = 0;
-       else
-               he->diff.wdiff = new_period * compute_wdiff_w2 -
-                                old_period * compute_wdiff_w1;
+       he->diff.wdiff = new_period * compute_wdiff_w2 -
+                        old_period * compute_wdiff_w1;
 
        return he->diff.wdiff;
 }
@@ -385,18 +378,21 @@ static void hists__precompute(struct hists *hists)
 
        while (next != NULL) {
                struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node);
+               struct hist_entry *pair = hist_entry__next_pair(he);
 
                next = rb_next(&he->rb_node);
+               if (!pair)
+                       continue;
 
                switch (compute) {
                case COMPUTE_DELTA:
-                       perf_diff__compute_delta(he);
+                       perf_diff__compute_delta(he, pair);
                        break;
                case COMPUTE_RATIO:
-                       perf_diff__compute_ratio(he);
+                       perf_diff__compute_ratio(he, pair);
                        break;
                case COMPUTE_WEIGHTED_DIFF:
-                       perf_diff__compute_wdiff(he);
+                       perf_diff__compute_wdiff(he, pair);
                        break;
                default:
                        BUG_ON(1);

diff --git a/tools/perf/ui/hist.c b/tools/perf/ui/hist.c
index 6e639b506829190fad4a111a08808cd4caf6f720..108e5ed67621bfb8ef4ad82dea897fbe9328c57f 100644 (file)
--- a/tools/perf/ui/hist.c
+++ b/tools/perf/ui/hist.c
@@ -268,14 +268,18 @@ static int hpp__width_delta(struct perf_hpp *hpp __maybe_unused)
 
 static int hpp__entry_delta(struct perf_hpp *hpp, struct hist_entry *he)
 {
+       struct hist_entry *pair = hist_entry__next_pair(he);
        const char *fmt = symbol_conf.field_sep ? "%s" : "%7.7s";
        char buf[32] = " ";
-       double diff;
+       double diff = 0.0;
 
-       if (he->diff.computed)
-               diff = he->diff.period_ratio_delta;
-       else
-               diff = perf_diff__compute_delta(he);
+       if (pair) {
+               if (he->diff.computed)
+                       diff = he->diff.period_ratio_delta;
+               else
+                       diff = perf_diff__compute_delta(he, pair);
+       } else
+               diff = perf_diff__period_percent(he, he->stat.period);
 
        if (fabs(diff) >= 0.01)
                scnprintf(buf, sizeof(buf), "%+4.2F%%", diff);
@@ -297,14 +301,17 @@ static int hpp__width_ratio(struct perf_hpp *hpp __maybe_unused)
 
 static int hpp__entry_ratio(struct perf_hpp *hpp, struct hist_entry *he)
 {
+       struct hist_entry *pair = hist_entry__next_pair(he);
        const char *fmt = symbol_conf.field_sep ? "%s" : "%14s";
        char buf[32] = " ";
-       double ratio;
+       double ratio = 0.0;
 
-       if (he->diff.computed)
-               ratio = he->diff.period_ratio;
-       else
-               ratio = perf_diff__compute_ratio(he);
+       if (pair) {
+               if (he->diff.computed)
+                       ratio = he->diff.period_ratio;
+               else
+                       ratio = perf_diff__compute_ratio(he, pair);
+       }
 
        if (ratio > 0.0)
                scnprintf(buf, sizeof(buf), "%+14.6F", ratio);
@@ -326,14 +333,17 @@ static int hpp__width_wdiff(struct perf_hpp *hpp __maybe_unused)
 
 static int hpp__entry_wdiff(struct perf_hpp *hpp, struct hist_entry *he)
 {
+       struct hist_entry *pair = hist_entry__next_pair(he);
        const char *fmt = symbol_conf.field_sep ? "%s" : "%14s";
        char buf[32] = " ";
-       s64 wdiff;
+       s64 wdiff = 0;
 
-       if (he->diff.computed)
-               wdiff = he->diff.wdiff;
-       else
-               wdiff = perf_diff__compute_wdiff(he);
+       if (pair) {
+               if (he->diff.computed)
+                       wdiff = he->diff.wdiff;
+               else
+                       wdiff = perf_diff__compute_wdiff(he, pair);
+       }
 
        if (wdiff != 0)
                scnprintf(buf, sizeof(buf), "%14ld", wdiff);

diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index a935a60d521c564cc780e01a357c7240ca9e2187..235503aac08c421a76d0698ff24ae93ba76e26e0 100644 (file)
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -226,8 +226,9 @@ int perf_evlist__gtk_browse_hists(struct perf_evlist *evlist __maybe_unused,
 
 unsigned int hists__sort_list_width(struct hists *self);
 
-double perf_diff__compute_delta(struct hist_entry *he);
-double perf_diff__compute_ratio(struct hist_entry *he);
-s64 perf_diff__compute_wdiff(struct hist_entry *he);
+double perf_diff__compute_delta(struct hist_entry *he, struct hist_entry *pair);
+double perf_diff__compute_ratio(struct hist_entry *he, struct hist_entry *pair);
+s64 perf_diff__compute_wdiff(struct hist_entry *he, struct hist_entry *pair);
 int perf_diff__formula(char *buf, size_t size, struct hist_entry *he);
+double perf_diff__period_percent(struct hist_entry *he, u64 period);
 #endif /* __PERF_HIST_H */