linux/tools/perf/util/hist.c

670 lines
14 KiB
C

#include "hist.h"
#include "session.h"
#include "sort.h"
#include <math.h>
struct callchain_param callchain_param = {
.mode = CHAIN_GRAPH_REL,
.min_percent = 0.5
};
/*
* histogram, sorted on item, collects counts
*/
struct hist_entry *__perf_session__add_hist_entry(struct rb_root *hists,
struct addr_location *al,
struct symbol *sym_parent,
u64 count, bool *hit)
{
struct rb_node **p = &hists->rb_node;
struct rb_node *parent = NULL;
struct hist_entry *he;
struct hist_entry entry = {
.thread = al->thread,
.ms = {
.map = al->map,
.sym = al->sym,
},
.ip = al->addr,
.level = al->level,
.count = count,
.parent = sym_parent,
};
int cmp;
while (*p != NULL) {
parent = *p;
he = rb_entry(parent, struct hist_entry, rb_node);
cmp = hist_entry__cmp(&entry, he);
if (!cmp) {
*hit = true;
return he;
}
if (cmp < 0)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
he = malloc(sizeof(*he));
if (!he)
return NULL;
*he = entry;
rb_link_node(&he->rb_node, parent, p);
rb_insert_color(&he->rb_node, hists);
*hit = false;
return he;
}
int64_t
hist_entry__cmp(struct hist_entry *left, struct hist_entry *right)
{
struct sort_entry *se;
int64_t cmp = 0;
list_for_each_entry(se, &hist_entry__sort_list, list) {
cmp = se->cmp(left, right);
if (cmp)
break;
}
return cmp;
}
int64_t
hist_entry__collapse(struct hist_entry *left, struct hist_entry *right)
{
struct sort_entry *se;
int64_t cmp = 0;
list_for_each_entry(se, &hist_entry__sort_list, list) {
int64_t (*f)(struct hist_entry *, struct hist_entry *);
f = se->collapse ?: se->cmp;
cmp = f(left, right);
if (cmp)
break;
}
return cmp;
}
void hist_entry__free(struct hist_entry *he)
{
free(he);
}
/*
* collapse the histogram
*/
static void collapse__insert_entry(struct rb_root *root, struct hist_entry *he)
{
struct rb_node **p = &root->rb_node;
struct rb_node *parent = NULL;
struct hist_entry *iter;
int64_t cmp;
while (*p != NULL) {
parent = *p;
iter = rb_entry(parent, struct hist_entry, rb_node);
cmp = hist_entry__collapse(iter, he);
if (!cmp) {
iter->count += he->count;
hist_entry__free(he);
return;
}
if (cmp < 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);
}
void perf_session__collapse_resort(struct rb_root *hists)
{
struct rb_root tmp;
struct rb_node *next;
struct hist_entry *n;
if (!sort__need_collapse)
return;
tmp = RB_ROOT;
next = rb_first(hists);
while (next) {
n = rb_entry(next, struct hist_entry, rb_node);
next = rb_next(&n->rb_node);
rb_erase(&n->rb_node, hists);
collapse__insert_entry(&tmp, n);
}
*hists = tmp;
}
/*
* reverse the map, sort on count.
*/
static void perf_session__insert_output_hist_entry(struct rb_root *root,
struct hist_entry *he,
u64 min_callchain_hits)
{
struct rb_node **p = &root->rb_node;
struct rb_node *parent = NULL;
struct hist_entry *iter;
if (symbol_conf.use_callchain)
callchain_param.sort(&he->sorted_chain, &he->callchain,
min_callchain_hits, &callchain_param);
while (*p != NULL) {
parent = *p;
iter = rb_entry(parent, struct hist_entry, rb_node);
if (he->count > iter->count)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
rb_link_node(&he->rb_node, parent, p);
rb_insert_color(&he->rb_node, root);
}
void perf_session__output_resort(struct rb_root *hists, u64 total_samples)
{
struct rb_root tmp;
struct rb_node *next;
struct hist_entry *n;
u64 min_callchain_hits;
min_callchain_hits =
total_samples * (callchain_param.min_percent / 100);
tmp = RB_ROOT;
next = rb_first(hists);
while (next) {
n = rb_entry(next, struct hist_entry, rb_node);
next = rb_next(&n->rb_node);
rb_erase(&n->rb_node, hists);
perf_session__insert_output_hist_entry(&tmp, n,
min_callchain_hits);
}
*hists = tmp;
}
static size_t callchain__fprintf_left_margin(FILE *fp, int left_margin)
{
int i;
int ret = fprintf(fp, " ");
for (i = 0; i < left_margin; i++)
ret += fprintf(fp, " ");
return ret;
}
static size_t ipchain__fprintf_graph_line(FILE *fp, int depth, int depth_mask,
int left_margin)
{
int i;
size_t ret = callchain__fprintf_left_margin(fp, left_margin);
for (i = 0; i < depth; i++)
if (depth_mask & (1 << i))
ret += fprintf(fp, "| ");
else
ret += fprintf(fp, " ");
ret += fprintf(fp, "\n");
return ret;
}
static size_t ipchain__fprintf_graph(FILE *fp, struct callchain_list *chain,
int depth, int depth_mask, int count,
u64 total_samples, int hits,
int left_margin)
{
int i;
size_t ret = 0;
ret += callchain__fprintf_left_margin(fp, left_margin);
for (i = 0; i < depth; i++) {
if (depth_mask & (1 << i))
ret += fprintf(fp, "|");
else
ret += fprintf(fp, " ");
if (!count && i == depth - 1) {
double percent;
percent = hits * 100.0 / total_samples;
ret += percent_color_fprintf(fp, "--%2.2f%%-- ", percent);
} else
ret += fprintf(fp, "%s", " ");
}
if (chain->ms.sym)
ret += fprintf(fp, "%s\n", chain->ms.sym->name);
else
ret += fprintf(fp, "%p\n", (void *)(long)chain->ip);
return ret;
}
static struct symbol *rem_sq_bracket;
static struct callchain_list rem_hits;
static void init_rem_hits(void)
{
rem_sq_bracket = malloc(sizeof(*rem_sq_bracket) + 6);
if (!rem_sq_bracket) {
fprintf(stderr, "Not enough memory to display remaining hits\n");
return;
}
strcpy(rem_sq_bracket->name, "[...]");
rem_hits.ms.sym = rem_sq_bracket;
}
static size_t __callchain__fprintf_graph(FILE *fp, struct callchain_node *self,
u64 total_samples, int depth,
int depth_mask, int left_margin)
{
struct rb_node *node, *next;
struct callchain_node *child;
struct callchain_list *chain;
int new_depth_mask = depth_mask;
u64 new_total;
u64 remaining;
size_t ret = 0;
int i;
if (callchain_param.mode == CHAIN_GRAPH_REL)
new_total = self->children_hit;
else
new_total = total_samples;
remaining = new_total;
node = rb_first(&self->rb_root);
while (node) {
u64 cumul;
child = rb_entry(node, struct callchain_node, rb_node);
cumul = cumul_hits(child);
remaining -= cumul;
/*
* The depth mask manages the output of pipes that show
* the depth. We don't want to keep the pipes of the current
* level for the last child of this depth.
* Except if we have remaining filtered hits. They will
* supersede the last child
*/
next = rb_next(node);
if (!next && (callchain_param.mode != CHAIN_GRAPH_REL || !remaining))
new_depth_mask &= ~(1 << (depth - 1));
/*
* But we keep the older depth mask for the line separator
* to keep the level link until we reach the last child
*/
ret += ipchain__fprintf_graph_line(fp, depth, depth_mask,
left_margin);
i = 0;
list_for_each_entry(chain, &child->val, list) {
ret += ipchain__fprintf_graph(fp, chain, depth,
new_depth_mask, i++,
new_total,
cumul,
left_margin);
}
ret += __callchain__fprintf_graph(fp, child, new_total,
depth + 1,
new_depth_mask | (1 << depth),
left_margin);
node = next;
}
if (callchain_param.mode == CHAIN_GRAPH_REL &&
remaining && remaining != new_total) {
if (!rem_sq_bracket)
return ret;
new_depth_mask &= ~(1 << (depth - 1));
ret += ipchain__fprintf_graph(fp, &rem_hits, depth,
new_depth_mask, 0, new_total,
remaining, left_margin);
}
return ret;
}
static size_t callchain__fprintf_graph(FILE *fp, struct callchain_node *self,
u64 total_samples, int left_margin)
{
struct callchain_list *chain;
bool printed = false;
int i = 0;
int ret = 0;
list_for_each_entry(chain, &self->val, list) {
if (!i++ && sort__first_dimension == SORT_SYM)
continue;
if (!printed) {
ret += callchain__fprintf_left_margin(fp, left_margin);
ret += fprintf(fp, "|\n");
ret += callchain__fprintf_left_margin(fp, left_margin);
ret += fprintf(fp, "---");
left_margin += 3;
printed = true;
} else
ret += callchain__fprintf_left_margin(fp, left_margin);
if (chain->ms.sym)
ret += fprintf(fp, " %s\n", chain->ms.sym->name);
else
ret += fprintf(fp, " %p\n", (void *)(long)chain->ip);
}
ret += __callchain__fprintf_graph(fp, self, total_samples, 1, 1, left_margin);
return ret;
}
static size_t callchain__fprintf_flat(FILE *fp, struct callchain_node *self,
u64 total_samples)
{
struct callchain_list *chain;
size_t ret = 0;
if (!self)
return 0;
ret += callchain__fprintf_flat(fp, self->parent, total_samples);
list_for_each_entry(chain, &self->val, list) {
if (chain->ip >= PERF_CONTEXT_MAX)
continue;
if (chain->ms.sym)
ret += fprintf(fp, " %s\n", chain->ms.sym->name);
else
ret += fprintf(fp, " %p\n",
(void *)(long)chain->ip);
}
return ret;
}
static size_t hist_entry_callchain__fprintf(FILE *fp, struct hist_entry *self,
u64 total_samples, int left_margin)
{
struct rb_node *rb_node;
struct callchain_node *chain;
size_t ret = 0;
rb_node = rb_first(&self->sorted_chain);
while (rb_node) {
double percent;
chain = rb_entry(rb_node, struct callchain_node, rb_node);
percent = chain->hit * 100.0 / total_samples;
switch (callchain_param.mode) {
case CHAIN_FLAT:
ret += percent_color_fprintf(fp, " %6.2f%%\n",
percent);
ret += callchain__fprintf_flat(fp, chain, total_samples);
break;
case CHAIN_GRAPH_ABS: /* Falldown */
case CHAIN_GRAPH_REL:
ret += callchain__fprintf_graph(fp, chain, total_samples,
left_margin);
case CHAIN_NONE:
default:
break;
}
ret += fprintf(fp, "\n");
rb_node = rb_next(rb_node);
}
return ret;
}
size_t hist_entry__fprintf(struct hist_entry *self,
struct perf_session *pair_session,
bool show_displacement,
long displacement, FILE *fp,
u64 session_total)
{
struct sort_entry *se;
u64 count, total;
const char *sep = symbol_conf.field_sep;
size_t ret;
if (symbol_conf.exclude_other && !self->parent)
return 0;
if (pair_session) {
count = self->pair ? self->pair->count : 0;
total = pair_session->events_stats.total;
} else {
count = self->count;
total = session_total;
}
if (total)
ret = percent_color_fprintf(fp, sep ? "%.2f" : " %6.2f%%",
(count * 100.0) / total);
else
ret = fprintf(fp, sep ? "%lld" : "%12lld ", count);
if (symbol_conf.show_nr_samples) {
if (sep)
ret += fprintf(fp, "%c%lld", *sep, count);
else
ret += fprintf(fp, "%11lld", count);
}
if (pair_session) {
char bf[32];
double old_percent = 0, new_percent = 0, diff;
if (total > 0)
old_percent = (count * 100.0) / total;
if (session_total > 0)
new_percent = (self->count * 100.0) / session_total;
diff = new_percent - old_percent;
if (fabs(diff) >= 0.01)
snprintf(bf, sizeof(bf), "%+4.2F%%", diff);
else
snprintf(bf, sizeof(bf), " ");
if (sep)
ret += fprintf(fp, "%c%s", *sep, bf);
else
ret += fprintf(fp, "%11.11s", bf);
if (show_displacement) {
if (displacement)
snprintf(bf, sizeof(bf), "%+4ld", displacement);
else
snprintf(bf, sizeof(bf), " ");
if (sep)
ret += fprintf(fp, "%c%s", *sep, bf);
else
ret += fprintf(fp, "%6.6s", bf);
}
}
list_for_each_entry(se, &hist_entry__sort_list, list) {
if (se->elide)
continue;
ret += fprintf(fp, "%s", sep ?: " ");
ret += se->print(fp, self, se->width ? *se->width : 0);
}
return ret + fprintf(fp, "\n");
}
static size_t hist_entry__fprintf_callchain(struct hist_entry *self, FILE *fp,
u64 session_total)
{
int left_margin = 0;
if (sort__first_dimension == SORT_COMM) {
struct sort_entry *se = list_first_entry(&hist_entry__sort_list,
typeof(*se), list);
left_margin = se->width ? *se->width : 0;
left_margin -= thread__comm_len(self->thread);
}
return hist_entry_callchain__fprintf(fp, self, session_total,
left_margin);
}
size_t perf_session__fprintf_hists(struct rb_root *hists,
struct perf_session *pair,
bool show_displacement, FILE *fp,
u64 session_total)
{
struct sort_entry *se;
struct rb_node *nd;
size_t ret = 0;
unsigned long position = 1;
long displacement = 0;
unsigned int width;
const char *sep = symbol_conf.field_sep;
char *col_width = symbol_conf.col_width_list_str;
init_rem_hits();
fprintf(fp, "# %s", pair ? "Baseline" : "Overhead");
if (symbol_conf.show_nr_samples) {
if (sep)
fprintf(fp, "%cSamples", *sep);
else
fputs(" Samples ", fp);
}
if (pair) {
if (sep)
ret += fprintf(fp, "%cDelta", *sep);
else
ret += fprintf(fp, " Delta ");
if (show_displacement) {
if (sep)
ret += fprintf(fp, "%cDisplacement", *sep);
else
ret += fprintf(fp, " Displ");
}
}
list_for_each_entry(se, &hist_entry__sort_list, list) {
if (se->elide)
continue;
if (sep) {
fprintf(fp, "%c%s", *sep, se->header);
continue;
}
width = strlen(se->header);
if (se->width) {
if (symbol_conf.col_width_list_str) {
if (col_width) {
*se->width = atoi(col_width);
col_width = strchr(col_width, ',');
if (col_width)
++col_width;
}
}
width = *se->width = max(*se->width, width);
}
fprintf(fp, " %*s", width, se->header);
}
fprintf(fp, "\n");
if (sep)
goto print_entries;
fprintf(fp, "# ........");
if (symbol_conf.show_nr_samples)
fprintf(fp, " ..........");
if (pair) {
fprintf(fp, " ..........");
if (show_displacement)
fprintf(fp, " .....");
}
list_for_each_entry(se, &hist_entry__sort_list, list) {
unsigned int i;
if (se->elide)
continue;
fprintf(fp, " ");
if (se->width)
width = *se->width;
else
width = strlen(se->header);
for (i = 0; i < width; i++)
fprintf(fp, ".");
}
fprintf(fp, "\n#\n");
print_entries:
for (nd = rb_first(hists); nd; nd = rb_next(nd)) {
struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node);
if (show_displacement) {
if (h->pair != NULL)
displacement = ((long)h->pair->position -
(long)position);
else
displacement = 0;
++position;
}
ret += hist_entry__fprintf(h, pair, show_displacement,
displacement, fp, session_total);
if (symbol_conf.use_callchain)
ret += hist_entry__fprintf_callchain(h, fp, session_total);
if (h->ms.map == NULL && verbose > 1) {
__map_groups__fprintf_maps(&h->thread->mg,
MAP__FUNCTION, fp);
fprintf(fp, "%.10s end\n", graph_dotted_line);
}
}
free(rem_sq_bracket);
return ret;
}