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perf diff: Add option to sort entries based on diff computation

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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 -c ratio -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

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Andi Kleen <andi@firstfloor.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/1349448287-18919-4-git-send-email-jolsa@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2012-10-05 16:44:42 +02:00 • committed by Arnaldo Carvalho de Melo
parent 7aaf6b3551
commit 96c47f1984
5 changed files with 167 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

137
tools/perf/builtin-diff.c
View file

@ -25,6 +25,7 @@ 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(const struct option *opt, const char *str,
return 0;
}
if (*str == '+') {
sort_compute = true;
str++;
if (!*str)
return 0;
}
for (i = 0; i < COMPUTE_MAX; i++)
if (!strcmp(str, compute_names[i])) {
*cp = i;
@ -61,6 +69,34 @@ static int setup_compute(const struct option *opt, const char *str,
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->stat.period);
double old_percent = pair ? get_period_percent(pair, pair->stat.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->stat.period;
double old_period = pair ? pair->stat.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)
{
@ -223,6 +259,102 @@ 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);
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);
@ -230,6 +362,11 @@ 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);
}