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perf report: Add "Fractal" mode output - support callchains with rela…
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…tive overhead rate

The current callchain displays the overhead rates as absolute:
relative to the total overhead.

This patch provides relative overhead percentage, in which each
branch of the callchain tree is a independant instrumentated object.

This provides a 'fractal' view of the call-chain profile: each
sub-graph looks like a profile in itself - relative to its parent.

You can produce such output by using the "fractal" mode
that you can abbreviate via f, fr, fra, frac, etc...

./perf report -s sym -c fractal

Example:

     8.46%  [k] copy_user_generic_string
                |
                |--52.01%-- generic_file_aio_read
                |          do_sync_read
                |          vfs_read
                |          |
                |          |--97.20%-- sys_pread64
                |          |          system_call_fastpath
                |          |          pread64
                |          |
                |           --2.81%-- sys_read
                |                     system_call_fastpath
                |                     __read
                |
                |--39.85%-- generic_file_buffered_write
                |          __generic_file_aio_write_nolock
                |          generic_file_aio_write
                |          do_sync_write
                |          reiserfs_file_write
                |          vfs_write
                |          |
                |          |--97.05%-- sys_pwrite64
                |          |          system_call_fastpath
                |          |          __pwrite64
                |          |
                |           --2.95%-- sys_write
                |                     system_call_fastpath
                |                     __write_nocancel
[...]

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Anton Blanchard <anton@samba.org>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <1246772361-9960-5-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Frederic Weisbecker authored and Ingo Molnar committed Jul 5, 2009
1 parent e05b876 commit 805d127
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Showing 3 changed files with 124 additions and 41 deletions.
60 changes: 40 additions & 20 deletions tools/perf/builtin-report.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -59,10 +59,15 @@ static regex_t parent_regex;

static int exclude_other = 1;

static char callchain_default_opt[] = "graph,0.5";
static char callchain_default_opt[] = "fractal,0.5";

static int callchain;
static enum chain_mode callchain_mode;
static double callchain_min_percent = 0.5;

static
struct callchain_param callchain_param = {
.mode = CHAIN_GRAPH_ABS,
.min_percent = 0.5
};

static u64 sample_type;

Expand Down Expand Up @@ -846,9 +851,15 @@ callchain__fprintf_graph(FILE *fp, struct callchain_node *self,
struct callchain_node *child;
struct callchain_list *chain;
int new_depth_mask = depth_mask;
u64 new_total;
size_t ret = 0;
int i;

if (callchain_param.mode == CHAIN_GRAPH_REL)
new_total = self->cumul_hit;
else
new_total = total_samples;

node = rb_first(&self->rb_root);
while (node) {
child = rb_entry(node, struct callchain_node, rb_node);
Expand All @@ -873,10 +884,10 @@ callchain__fprintf_graph(FILE *fp, struct callchain_node *self,
continue;
ret += ipchain__fprintf_graph(fp, chain, depth,
new_depth_mask, i++,
total_samples,
new_total,
child->cumul_hit);
}
ret += callchain__fprintf_graph(fp, child, total_samples,
ret += callchain__fprintf_graph(fp, child, new_total,
depth + 1,
new_depth_mask | (1 << depth));
node = next;
Expand Down Expand Up @@ -925,13 +936,18 @@ hist_entry_callchain__fprintf(FILE *fp, struct hist_entry *self,

chain = rb_entry(rb_node, struct callchain_node, rb_node);
percent = chain->hit * 100.0 / total_samples;
if (callchain_mode == FLAT) {
switch (callchain_param.mode) {
case CHAIN_FLAT:
ret += percent_color_fprintf(fp, " %6.2f%%\n",
percent);
ret += callchain__fprintf_flat(fp, chain, total_samples);
} else if (callchain_mode == GRAPH) {
break;
case CHAIN_GRAPH_ABS: /* Falldown */
case CHAIN_GRAPH_REL:
ret += callchain__fprintf_graph(fp, chain,
total_samples, 1, 1);
default:
break;
}
ret += fprintf(fp, "\n");
rb_node = rb_next(rb_node);
Expand Down Expand Up @@ -1219,14 +1235,9 @@ static void output__insert_entry(struct hist_entry *he, u64 min_callchain_hits)
struct rb_node *parent = NULL;
struct hist_entry *iter;

if (callchain) {
if (callchain_mode == FLAT)
sort_chain_flat(&he->sorted_chain, &he->callchain,
min_callchain_hits);
else if (callchain_mode == GRAPH)
sort_chain_graph(&he->sorted_chain, &he->callchain,
min_callchain_hits);
}
if (callchain)
callchain_param.sort(&he->sorted_chain, &he->callchain,
min_callchain_hits, &callchain_param);

while (*p != NULL) {
parent = *p;
Expand All @@ -1249,7 +1260,7 @@ static void output__resort(u64 total_samples)
struct rb_root *tree = &hist;
u64 min_callchain_hits;

min_callchain_hits = total_samples * (callchain_min_percent / 100);
min_callchain_hits = total_samples * (callchain_param.min_percent / 100);

if (sort__need_collapse)
tree = &collapse_hists;
Expand Down Expand Up @@ -1829,22 +1840,31 @@ parse_callchain_opt(const struct option *opt __used, const char *arg,

/* get the output mode */
if (!strncmp(tok, "graph", strlen(arg)))
callchain_mode = GRAPH;
callchain_param.mode = CHAIN_GRAPH_ABS;

else if (!strncmp(tok, "flat", strlen(arg)))
callchain_mode = FLAT;
callchain_param.mode = CHAIN_FLAT;

else if (!strncmp(tok, "fractal", strlen(arg)))
callchain_param.mode = CHAIN_GRAPH_REL;

else
return -1;

/* get the min percentage */
tok = strtok(NULL, ",");
if (!tok)
return 0;
goto setup;

callchain_min_percent = strtod(tok, &endptr);
callchain_param.min_percent = strtod(tok, &endptr);
if (tok == endptr)
return -1;

setup:
if (register_callchain_param(&callchain_param) < 0) {
fprintf(stderr, "Can't register callchain params\n");
return -1;
}
return 0;
}

Expand Down
84 changes: 69 additions & 15 deletions tools/perf/util/callchain.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -32,13 +32,14 @@ rb_insert_callchain(struct rb_root *root, struct callchain_node *chain,
rnode = rb_entry(parent, struct callchain_node, rb_node);

switch (mode) {
case FLAT:
case CHAIN_FLAT:
if (rnode->hit < chain->hit)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
break;
case GRAPH:
case CHAIN_GRAPH_ABS: /* Falldown */
case CHAIN_GRAPH_REL:
if (rnode->cumul_hit < chain->cumul_hit)
p = &(*p)->rb_left;
else
Expand All @@ -53,43 +54,96 @@ rb_insert_callchain(struct rb_root *root, struct callchain_node *chain,
rb_insert_color(&chain->rb_node, root);
}

static void
__sort_chain_flat(struct rb_root *rb_root, struct callchain_node *node,
u64 min_hit)
{
struct callchain_node *child;

chain_for_each_child(child, node)
__sort_chain_flat(rb_root, child, min_hit);

if (node->hit && node->hit >= min_hit)
rb_insert_callchain(rb_root, node, CHAIN_FLAT);
}

/*
* Once we get every callchains from the stream, we can now
* sort them by hit
*/
void sort_chain_flat(struct rb_root *rb_root, struct callchain_node *node,
u64 min_hit)
static void
sort_chain_flat(struct rb_root *rb_root, struct callchain_node *node,
u64 min_hit, struct callchain_param *param __used)
{
__sort_chain_flat(rb_root, node, min_hit);
}

static void __sort_chain_graph_abs(struct callchain_node *node,
u64 min_hit)
{
struct callchain_node *child;

chain_for_each_child(child, node)
sort_chain_flat(rb_root, child, min_hit);
node->rb_root = RB_ROOT;

if (node->hit && node->hit >= min_hit)
rb_insert_callchain(rb_root, node, FLAT);
chain_for_each_child(child, node) {
__sort_chain_graph_abs(child, min_hit);
if (child->cumul_hit >= min_hit)
rb_insert_callchain(&node->rb_root, child,
CHAIN_GRAPH_ABS);
}
}

static void
sort_chain_graph_abs(struct rb_root *rb_root, struct callchain_node *chain_root,
u64 min_hit, struct callchain_param *param __used)
{
__sort_chain_graph_abs(chain_root, min_hit);
rb_root->rb_node = chain_root->rb_root.rb_node;
}

static void __sort_chain_graph(struct callchain_node *node, u64 min_hit)
static void __sort_chain_graph_rel(struct callchain_node *node,
double min_percent)
{
struct callchain_node *child;
u64 min_hit;

node->rb_root = RB_ROOT;
min_hit = node->cumul_hit * min_percent / 100.0;

chain_for_each_child(child, node) {
__sort_chain_graph(child, min_hit);
__sort_chain_graph_rel(child, min_percent);
if (child->cumul_hit >= min_hit)
rb_insert_callchain(&node->rb_root, child, GRAPH);
rb_insert_callchain(&node->rb_root, child,
CHAIN_GRAPH_REL);
}
}

void
sort_chain_graph(struct rb_root *rb_root, struct callchain_node *chain_root,
u64 min_hit)
static void
sort_chain_graph_rel(struct rb_root *rb_root, struct callchain_node *chain_root,
u64 min_hit __used, struct callchain_param *param)
{
__sort_chain_graph(chain_root, min_hit);
__sort_chain_graph_rel(chain_root, param->min_percent);
rb_root->rb_node = chain_root->rb_root.rb_node;
}

int register_callchain_param(struct callchain_param *param)
{
switch (param->mode) {
case CHAIN_GRAPH_ABS:
param->sort = sort_chain_graph_abs;
break;
case CHAIN_GRAPH_REL:
param->sort = sort_chain_graph_rel;
break;
case CHAIN_FLAT:
param->sort = sort_chain_flat;
break;
default:
return -1;
}
return 0;
}

/*
* Create a child for a parent. If inherit_children, then the new child
* will become the new parent of it's parent children
Expand Down
21 changes: 15 additions & 6 deletions tools/perf/util/callchain.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -7,8 +7,9 @@
#include "symbol.h"

enum chain_mode {
FLAT,
GRAPH
CHAIN_FLAT,
CHAIN_GRAPH_ABS,
CHAIN_GRAPH_REL
};

struct callchain_node {
Expand All @@ -23,6 +24,17 @@ struct callchain_node {
u64 cumul_hit; /* hit + hits of children */
};

struct callchain_param;

typedef void (*sort_chain_func_t)(struct rb_root *, struct callchain_node *,
u64, struct callchain_param *);

struct callchain_param {
enum chain_mode mode;
double min_percent;
sort_chain_func_t sort;
};

struct callchain_list {
u64 ip;
struct symbol *sym;
Expand All @@ -36,10 +48,7 @@ static inline void callchain_init(struct callchain_node *node)
INIT_LIST_HEAD(&node->val);
}

int register_callchain_param(struct callchain_param *param);
void append_chain(struct callchain_node *root, struct ip_callchain *chain,
struct symbol **syms);
void sort_chain_flat(struct rb_root *rb_root, struct callchain_node *node,
u64 min_hit);
void sort_chain_graph(struct rb_root *rb_root, struct callchain_node *node,
u64 min_hit);
#endif

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