perf diff: Change formula methods to work with pair directly

Changing formula 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/1354110769-2998-7-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 342085a180760d956ea203482ebcc9c21595dd52..d869029fb75e9afde8a7b1b28c403c127a3c29bc 100644 (file)
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -184,13 +184,9 @@ s64 perf_diff__compute_wdiff(struct hist_entry *he, struct hist_entry *pair)
        return he->diff.wdiff;
 }
 
-static int formula_delta(struct hist_entry *he, char *buf, size_t size)
+static int formula_delta(struct hist_entry *he, struct hist_entry *pair,
+                        char *buf, size_t size)
 {
-       struct hist_entry *pair = hist_entry__next_pair(he);
-
-       if (!pair)
-               return -1;
-
        return scnprintf(buf, size,
                         "(%" PRIu64 " * 100 / %" PRIu64 ") - "
                         "(%" PRIu64 " * 100 / %" PRIu64 ")",
@@ -198,41 +194,36 @@ static int formula_delta(struct hist_entry *he, char *buf, size_t size)
                          pair->stat.period, pair->hists->stats.total_period);
 }
 
-static int formula_ratio(struct hist_entry *he, char *buf, size_t size)
+static int formula_ratio(struct hist_entry *he, struct hist_entry *pair,
+                        char *buf, size_t size)
 {
-       struct hist_entry *pair = hist_entry__next_pair(he);
        double new_period = he->stat.period;
-       double old_period = pair ? pair->stat.period : 0;
-
-       if (!pair)
-               return -1;
+       double old_period = pair->stat.period;
 
        return scnprintf(buf, size, "%.0F / %.0F", new_period, old_period);
 }
 
-static int formula_wdiff(struct hist_entry *he, char *buf, size_t size)
+static int formula_wdiff(struct hist_entry *he, struct hist_entry *pair,
+                        char *buf, size_t size)
 {
-       struct hist_entry *pair = hist_entry__next_pair(he);
        u64 new_period = he->stat.period;
-       u64 old_period = pair ? pair->stat.period : 0;
-
-       if (!pair)
-               return -1;
+       u64 old_period = pair->stat.period;
 
        return scnprintf(buf, size,
                  "(%" PRIu64 " * " "%" PRId64 ") - (%" PRIu64 " * " "%" PRId64 ")",
                  new_period, compute_wdiff_w2, old_period, compute_wdiff_w1);
 }
 
-int perf_diff__formula(char *buf, size_t size, struct hist_entry *he)
+int perf_diff__formula(struct hist_entry *he, struct hist_entry *pair,
+                      char *buf, size_t size)
 {
        switch (compute) {
        case COMPUTE_DELTA:
-               return formula_delta(he, buf, size);
+               return formula_delta(he, pair, buf, size);
        case COMPUTE_RATIO:
-               return formula_ratio(he, buf, size);
+               return formula_ratio(he, pair, buf, size);
        case COMPUTE_WEIGHTED_DIFF:
-               return formula_wdiff(he, buf, size);
+               return formula_wdiff(he, pair, buf, size);
        default:
                BUG_ON(1);
        }

diff --git a/tools/perf/ui/hist.c b/tools/perf/ui/hist.c
index 108e5ed67621bfb8ef4ad82dea897fbe9328c57f..1785bab7adfd83cc2827b81c53ed40d6304dbbdf 100644 (file)
--- a/tools/perf/ui/hist.c
+++ b/tools/perf/ui/hist.c
@@ -389,10 +389,13 @@ static int hpp__width_formula(struct perf_hpp *hpp __maybe_unused)
 
 static int hpp__entry_formula(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" : "%-70s";
        char buf[96] = " ";
 
-       perf_diff__formula(buf, sizeof(buf), he);
+       if (pair)
+               perf_diff__formula(he, pair, buf, sizeof(buf));
+
        return scnprintf(hpp->buf, hpp->size, fmt, buf);
 }
 

diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 235503aac08c421a76d0698ff24ae93ba76e26e0..c1b2fade8e7013df6f939109b2dc2627abebb7cf 100644 (file)
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -229,6 +229,7 @@ unsigned int hists__sort_list_width(struct hists *self);
 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);
+int perf_diff__formula(struct hist_entry *he, struct hist_entry *pair,
+                      char *buf, size_t size);
 double perf_diff__period_percent(struct hist_entry *he, u64 period);
 #endif /* __PERF_HIST_H */