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perf report: Add "Fractal" mode output - support callchains with relative overhead rate

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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>
This commit is contained in:
Frederic Weisbecker
2009-07-05 07:39:21 +02:00
committed by Ingo Molnar
parent e05b876c22
commit 805d127d62
3 changed files with 126 additions and 43 deletions
Download Patch File Download Diff File Expand all files Collapse all files

88
tools/perf/util/callchain.c
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@@ -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
@@ -53,43 +54,96 @@ rb_insert_callchain(struct rb_root *root, struct callchain_node *chain,
rb_insert_color(&chain->rb_node, root);
}
/*
* 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_node *child;
chain_for_each_child(child, node)
sort_chain_flat(rb_root, child, min_hit);
__sort_chain_flat(rb_root, child, min_hit);
if (node->hit && node->hit >= min_hit)
rb_insert_callchain(rb_root, node, FLAT);
rb_insert_callchain(rb_root, node, CHAIN_FLAT);
}
static void __sort_chain_graph(struct callchain_node *node, u64 min_hit)
/*
* Once we get every callchains from the stream, we can now
* sort them by 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;
node->rb_root = RB_ROOT;
chain_for_each_child(child, node) {
__sort_chain_graph(child, min_hit);
__sort_chain_graph_abs(child, min_hit);
if (child->cumul_hit >= min_hit)
rb_insert_callchain(&node->rb_root, child, GRAPH);
rb_insert_callchain(&node->rb_root, child,
CHAIN_GRAPH_ABS);
}
}
void
sort_chain_graph(struct rb_root *rb_root, struct callchain_node *chain_root,
u64 min_hit)
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(chain_root, min_hit);
__sort_chain_graph_abs(chain_root, min_hit);
rb_root->rb_node = chain_root->rb_root.rb_node;
}
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_rel(child, min_percent);
if (child->cumul_hit >= min_hit)
rb_insert_callchain(&node->rb_root, child,
CHAIN_GRAPH_REL);
}
}
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_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