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Subject[PATCH 08/12] perf diff: Add option to sort entries based on diff computation
Date
Adding support to sort hist entries based on the outcome of selected
computation. It's now possible to specify '+' as a first character
of '-c' option value to make such sort.

Example:

$ ./perf diff -cratio -b
# Event 'cache-misses'
#
# Baseline Ratio Shared Object Symbol
# ........ .............. ................. ................................
#
19.64% 0.69 [kernel.kallsyms] [k] clear_page
0.30% 0.17 [kernel.kallsyms] [k] mm_alloc
0.04% 0.20 [kernel.kallsyms] [k] kmem_cache_alloc
$ ./perf diff -c+ratio -b
# Event 'cache-misses'
#
# Baseline Ratio Shared Object Symbol
# ........ .............. ................. ................................
#
19.64% 0.69 [kernel.kallsyms] [k] clear_page
0.04% 0.20 [kernel.kallsyms] [k] kmem_cache_alloc
0.30% 0.17 [kernel.kallsyms] [k] mm_alloc
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
---
tools/perf/Documentation/perf-diff.txt | 2 +
tools/perf/builtin-diff.c | 140 +++++++++++++++++++++++++++++++++
tools/perf/ui/stdio/hist.c | 20 +++--
tools/perf/ui/stdio/hist.h | 4 +
tools/perf/util/sort.h | 15 ++++
5 files changed, 173 insertions(+), 8 deletions(-)
diff --git a/tools/perf/Documentation/perf-diff.txt b/tools/perf/Documentation/perf-diff.txt
index 8fff061..cff3d9b 100644
--- a/tools/perf/Documentation/perf-diff.txt
+++ b/tools/perf/Documentation/perf-diff.txt
@@ -79,6 +79,8 @@ OPTIONS
-c::
--compute::
Differential computation selection - delta,ratio (default is delta).
+ If '+' is specified as a first character, the output is sorted based
+ on the computation results.
See COMPARISON METHODS section for more info.

COMPARISON METHODS
diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index cde08d4..f72a2e4 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -26,6 +26,7 @@ static char diff__default_sort_order[] = "dso,symbol";
static bool force;
static bool show_displacement;
static bool show_baseline_only;
+static bool sort_compute;

enum {
COMPUTE_DELTA,
@@ -50,6 +51,13 @@ static int setup_compute(void)
return 0;
}

+ if (*compute_str == '+') {
+ sort_compute = true;
+ compute_str++;
+ if (!*compute_str)
+ return 0;
+ }
+
for (i = 0; i < COMPUTE_MAX; i++)
if (!strcmp(compute_str, compute_names[i])) {
compute = i;
@@ -60,6 +68,34 @@ static int setup_compute(void)
return -EINVAL;
}

+static double get_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)
+{
+ struct hist_entry *pair = he->pair;
+ double new_percent = get_period_percent(he, he->period);
+ double old_percent = pair ? get_period_percent(pair, pair->period) : 0.0;
+
+ 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)
+{
+ struct hist_entry *pair = he->pair;
+ double new_period = he->period;
+ double old_period = pair ? pair->period : 0;
+
+ he->diff.computed = true;
+ he->diff.period_ratio = pair ? (new_period / old_period) : 0;
+ return he->diff.period_ratio;
+}
+
static int hists__add_entry(struct hists *self,
struct addr_location *al, u64 period)
{
@@ -222,6 +258,105 @@ static void hists__baseline_only(struct hists *hists)
}
}

+static void hists__precompute(struct hists *hists)
+{
+ struct rb_node *next = rb_first(&hists->entries);
+
+ while (next != NULL) {
+ struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node);
+
+ next = rb_next(&he->rb_node);
+
+ if (!he->pair)
+ continue;
+
+ switch (compute) {
+ case COMPUTE_DELTA:
+ perf_diff__compute_delta(he);
+ break;
+ case COMPUTE_RATIO:
+ perf_diff__compute_ratio(he);
+ break;
+ default:
+ BUG_ON(1);
+ }
+ }
+}
+
+static int64_t cmp_doubles(double l, double r)
+{
+ if (l > r)
+ return -1;
+ else if (l < r)
+ return 1;
+ else
+ return 0;
+}
+
+static int64_t
+hist_entry__cmp_compute(struct hist_entry *left, struct hist_entry *right,
+ int c)
+{
+ switch (c) {
+ case COMPUTE_DELTA:
+ {
+ double l = left->diff.period_ratio_delta;
+ double r = right->diff.period_ratio_delta;
+
+ return cmp_doubles(l, r);
+ }
+ case COMPUTE_RATIO:
+ {
+ double l = left->diff.period_ratio;
+ double r = right->diff.period_ratio;
+
+ return cmp_doubles(l, r);
+ }
+ default:
+ BUG_ON(1);
+ }
+
+ return 0;
+}
+
+static void insert_hist_entry_by_compute(struct rb_root *root,
+ struct hist_entry *he,
+ int c)
+{
+ struct rb_node **p = &root->rb_node;
+ struct rb_node *parent = NULL;
+ struct hist_entry *iter;
+
+ while (*p != NULL) {
+ parent = *p;
+ iter = rb_entry(parent, struct hist_entry, rb_node);
+ if (hist_entry__cmp_compute(he, iter, c) < 0)
+ p = &(*p)->rb_left;
+ else
+ p = &(*p)->rb_right;
+ }
+
+ rb_link_node(&he->rb_node, parent, p);
+ rb_insert_color(&he->rb_node, root);
+}
+
+static void hists__compute_resort(struct hists *hists)
+{
+ struct rb_root tmp = RB_ROOT;
+ struct rb_node *next = rb_first(&hists->entries);
+
+ while (next != NULL) {
+ struct hist_entry *he = rb_entry(next, struct hist_entry, rb_node);
+
+ next = rb_next(&he->rb_node);
+
+ rb_erase(&he->rb_node, &hists->entries);
+ insert_hist_entry_by_compute(&tmp, he, compute);
+ }
+
+ hists->entries = tmp;
+}
+
static void hists__process(struct hists *old, struct hists *new)
{
hists__match(old, new);
@@ -229,6 +364,11 @@ static void hists__process(struct hists *old, struct hists *new)
if (show_baseline_only)
hists__baseline_only(new);

+ if (sort_compute) {
+ hists__precompute(new);
+ hists__compute_resort(new);
+ }
+
hists__fprintf(new, true, 0, 0, stdout);
}

diff --git a/tools/perf/ui/stdio/hist.c b/tools/perf/ui/stdio/hist.c
index 02ba1c7..8c717ab 100644
--- a/tools/perf/ui/stdio/hist.c
+++ b/tools/perf/ui/stdio/hist.c
@@ -16,12 +16,14 @@ static int
hists_stdio_column__delta_snprintf(struct hist_entry *he, char *bf,
size_t size, unsigned int width __used)
{
- struct hist_entry *pair = he->pair;
- double new_percent = get_period_percent(he, he->period);
- double old_percent = pair ? get_period_percent(pair, pair->period) : 0.0;
- double diff = new_percent - old_percent;
+ double diff;
int ret;

+ if (he->diff.computed)
+ diff = he->diff.period_ratio_delta;
+ else
+ diff = perf_diff__compute_delta(he);
+
if (fabs(diff) >= 0.01)
ret = percent_color_snprintf(bf, size, "%+7.2F%%", diff);
else
@@ -34,10 +36,12 @@ static int
hists_stdio_column__ratio_snprintf(struct hist_entry *he, char *bf,
size_t size, unsigned int width __used)
{
- struct hist_entry *pair = he->pair;
- double new_period = he->period;
- double old_period = pair ? pair->period : 0;
- double ratio = pair ? new_period / old_period : 0;
+ double ratio;
+
+ if (he->diff.computed)
+ ratio = he->diff.period_ratio;
+ else
+ ratio = perf_diff__compute_ratio(he);

return percent_color_snprintf(bf, size, "%14.3F", ratio);
}
diff --git a/tools/perf/ui/stdio/hist.h b/tools/perf/ui/stdio/hist.h
index 8e15d88..c8ac633 100644
--- a/tools/perf/ui/stdio/hist.h
+++ b/tools/perf/ui/stdio/hist.h
@@ -16,4 +16,8 @@ struct hists_stdio_column {
int hists_stdio_column__register_idx(int idx);
void hists_stdio_column__register_global(void);
void hists_stdio_column__set_width(struct hists *hists);
+
+double perf_diff__compute_delta(struct hist_entry *he);
+double perf_diff__compute_ratio(struct hist_entry *he);
+
#endif /* __PERF_UI_STDIO_HIST_H */
diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
index 967d381..9f707b7 100644
--- a/tools/perf/util/sort.h
+++ b/tools/perf/util/sort.h
@@ -42,6 +42,19 @@ extern struct sort_entry sort_sym_from;
extern struct sort_entry sort_sym_to;
extern enum sort_type sort__first_dimension;

+struct hist_entry_diff {
+ bool computed;
+
+ /* HISTC_DISPLACEMENT */
+ int displacement;
+
+ /* HISTC_DELTA */
+ double period_ratio_delta;
+
+ /* HISTC_RATIO */
+ double period_ratio;
+};
+
/**
* struct hist_entry - histogram entry
*
@@ -62,6 +75,8 @@ struct hist_entry {
s32 cpu;
u32 nr_events;

+ struct hist_entry_diff diff;
+
/* XXX These two should move to some tree widget lib */
u16 row_offset;
u16 nr_rows;
--
1.7.11.4


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