![Adrian Hunter](/assets/img/avatar_default.png)
Now that the sample parsing correctly checks data sizes there is no reason for it to be done again for callchains. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1377591794-30553-4-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
459 lines
10 KiB
C
459 lines
10 KiB
C
/*
|
|
* Copyright (C) 2009-2011, Frederic Weisbecker <fweisbec@gmail.com>
|
|
*
|
|
* Handle the callchains from the stream in an ad-hoc radix tree and then
|
|
* sort them in an rbtree.
|
|
*
|
|
* Using a radix for code path provides a fast retrieval and factorizes
|
|
* memory use. Also that lets us use the paths in a hierarchical graph view.
|
|
*
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <stdbool.h>
|
|
#include <errno.h>
|
|
#include <math.h>
|
|
|
|
#include "hist.h"
|
|
#include "util.h"
|
|
#include "callchain.h"
|
|
|
|
__thread struct callchain_cursor callchain_cursor;
|
|
|
|
#define chain_for_each_child(child, parent) \
|
|
list_for_each_entry(child, &parent->children, siblings)
|
|
|
|
#define chain_for_each_child_safe(child, next, parent) \
|
|
list_for_each_entry_safe(child, next, &parent->children, siblings)
|
|
|
|
static void
|
|
rb_insert_callchain(struct rb_root *root, struct callchain_node *chain,
|
|
enum chain_mode mode)
|
|
{
|
|
struct rb_node **p = &root->rb_node;
|
|
struct rb_node *parent = NULL;
|
|
struct callchain_node *rnode;
|
|
u64 chain_cumul = callchain_cumul_hits(chain);
|
|
|
|
while (*p) {
|
|
u64 rnode_cumul;
|
|
|
|
parent = *p;
|
|
rnode = rb_entry(parent, struct callchain_node, rb_node);
|
|
rnode_cumul = callchain_cumul_hits(rnode);
|
|
|
|
switch (mode) {
|
|
case CHAIN_FLAT:
|
|
if (rnode->hit < chain->hit)
|
|
p = &(*p)->rb_left;
|
|
else
|
|
p = &(*p)->rb_right;
|
|
break;
|
|
case CHAIN_GRAPH_ABS: /* Falldown */
|
|
case CHAIN_GRAPH_REL:
|
|
if (rnode_cumul < chain_cumul)
|
|
p = &(*p)->rb_left;
|
|
else
|
|
p = &(*p)->rb_right;
|
|
break;
|
|
case CHAIN_NONE:
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
rb_link_node(&chain->rb_node, parent, p);
|
|
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
|
|
*/
|
|
static void
|
|
sort_chain_flat(struct rb_root *rb_root, struct callchain_root *root,
|
|
u64 min_hit, struct callchain_param *param __maybe_unused)
|
|
{
|
|
__sort_chain_flat(rb_root, &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_abs(child, min_hit);
|
|
if (callchain_cumul_hits(child) >= 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_root *chain_root,
|
|
u64 min_hit, struct callchain_param *param __maybe_unused)
|
|
{
|
|
__sort_chain_graph_abs(&chain_root->node, min_hit);
|
|
rb_root->rb_node = chain_root->node.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 = ceil(node->children_hit * min_percent);
|
|
|
|
chain_for_each_child(child, node) {
|
|
__sort_chain_graph_rel(child, min_percent);
|
|
if (callchain_cumul_hits(child) >= 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_root *chain_root,
|
|
u64 min_hit __maybe_unused, struct callchain_param *param)
|
|
{
|
|
__sort_chain_graph_rel(&chain_root->node, param->min_percent / 100.0);
|
|
rb_root->rb_node = chain_root->node.rb_root.rb_node;
|
|
}
|
|
|
|
int callchain_register_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;
|
|
case CHAIN_NONE:
|
|
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
|
|
*/
|
|
static struct callchain_node *
|
|
create_child(struct callchain_node *parent, bool inherit_children)
|
|
{
|
|
struct callchain_node *new;
|
|
|
|
new = zalloc(sizeof(*new));
|
|
if (!new) {
|
|
perror("not enough memory to create child for code path tree");
|
|
return NULL;
|
|
}
|
|
new->parent = parent;
|
|
INIT_LIST_HEAD(&new->children);
|
|
INIT_LIST_HEAD(&new->val);
|
|
|
|
if (inherit_children) {
|
|
struct callchain_node *next;
|
|
|
|
list_splice(&parent->children, &new->children);
|
|
INIT_LIST_HEAD(&parent->children);
|
|
|
|
chain_for_each_child(next, new)
|
|
next->parent = new;
|
|
}
|
|
list_add_tail(&new->siblings, &parent->children);
|
|
|
|
return new;
|
|
}
|
|
|
|
|
|
/*
|
|
* Fill the node with callchain values
|
|
*/
|
|
static void
|
|
fill_node(struct callchain_node *node, struct callchain_cursor *cursor)
|
|
{
|
|
struct callchain_cursor_node *cursor_node;
|
|
|
|
node->val_nr = cursor->nr - cursor->pos;
|
|
if (!node->val_nr)
|
|
pr_warning("Warning: empty node in callchain tree\n");
|
|
|
|
cursor_node = callchain_cursor_current(cursor);
|
|
|
|
while (cursor_node) {
|
|
struct callchain_list *call;
|
|
|
|
call = zalloc(sizeof(*call));
|
|
if (!call) {
|
|
perror("not enough memory for the code path tree");
|
|
return;
|
|
}
|
|
call->ip = cursor_node->ip;
|
|
call->ms.sym = cursor_node->sym;
|
|
call->ms.map = cursor_node->map;
|
|
list_add_tail(&call->list, &node->val);
|
|
|
|
callchain_cursor_advance(cursor);
|
|
cursor_node = callchain_cursor_current(cursor);
|
|
}
|
|
}
|
|
|
|
static void
|
|
add_child(struct callchain_node *parent,
|
|
struct callchain_cursor *cursor,
|
|
u64 period)
|
|
{
|
|
struct callchain_node *new;
|
|
|
|
new = create_child(parent, false);
|
|
fill_node(new, cursor);
|
|
|
|
new->children_hit = 0;
|
|
new->hit = period;
|
|
}
|
|
|
|
/*
|
|
* Split the parent in two parts (a new child is created) and
|
|
* give a part of its callchain to the created child.
|
|
* Then create another child to host the given callchain of new branch
|
|
*/
|
|
static void
|
|
split_add_child(struct callchain_node *parent,
|
|
struct callchain_cursor *cursor,
|
|
struct callchain_list *to_split,
|
|
u64 idx_parents, u64 idx_local, u64 period)
|
|
{
|
|
struct callchain_node *new;
|
|
struct list_head *old_tail;
|
|
unsigned int idx_total = idx_parents + idx_local;
|
|
|
|
/* split */
|
|
new = create_child(parent, true);
|
|
|
|
/* split the callchain and move a part to the new child */
|
|
old_tail = parent->val.prev;
|
|
list_del_range(&to_split->list, old_tail);
|
|
new->val.next = &to_split->list;
|
|
new->val.prev = old_tail;
|
|
to_split->list.prev = &new->val;
|
|
old_tail->next = &new->val;
|
|
|
|
/* split the hits */
|
|
new->hit = parent->hit;
|
|
new->children_hit = parent->children_hit;
|
|
parent->children_hit = callchain_cumul_hits(new);
|
|
new->val_nr = parent->val_nr - idx_local;
|
|
parent->val_nr = idx_local;
|
|
|
|
/* create a new child for the new branch if any */
|
|
if (idx_total < cursor->nr) {
|
|
parent->hit = 0;
|
|
add_child(parent, cursor, period);
|
|
parent->children_hit += period;
|
|
} else {
|
|
parent->hit = period;
|
|
}
|
|
}
|
|
|
|
static int
|
|
append_chain(struct callchain_node *root,
|
|
struct callchain_cursor *cursor,
|
|
u64 period);
|
|
|
|
static void
|
|
append_chain_children(struct callchain_node *root,
|
|
struct callchain_cursor *cursor,
|
|
u64 period)
|
|
{
|
|
struct callchain_node *rnode;
|
|
|
|
/* lookup in childrens */
|
|
chain_for_each_child(rnode, root) {
|
|
unsigned int ret = append_chain(rnode, cursor, period);
|
|
|
|
if (!ret)
|
|
goto inc_children_hit;
|
|
}
|
|
/* nothing in children, add to the current node */
|
|
add_child(root, cursor, period);
|
|
|
|
inc_children_hit:
|
|
root->children_hit += period;
|
|
}
|
|
|
|
static int
|
|
append_chain(struct callchain_node *root,
|
|
struct callchain_cursor *cursor,
|
|
u64 period)
|
|
{
|
|
struct callchain_cursor_node *curr_snap = cursor->curr;
|
|
struct callchain_list *cnode;
|
|
u64 start = cursor->pos;
|
|
bool found = false;
|
|
u64 matches;
|
|
|
|
/*
|
|
* Lookup in the current node
|
|
* If we have a symbol, then compare the start to match
|
|
* anywhere inside a function, unless function
|
|
* mode is disabled.
|
|
*/
|
|
list_for_each_entry(cnode, &root->val, list) {
|
|
struct callchain_cursor_node *node;
|
|
struct symbol *sym;
|
|
|
|
node = callchain_cursor_current(cursor);
|
|
if (!node)
|
|
break;
|
|
|
|
sym = node->sym;
|
|
|
|
if (cnode->ms.sym && sym &&
|
|
callchain_param.key == CCKEY_FUNCTION) {
|
|
if (cnode->ms.sym->start != sym->start)
|
|
break;
|
|
} else if (cnode->ip != node->ip)
|
|
break;
|
|
|
|
if (!found)
|
|
found = true;
|
|
|
|
callchain_cursor_advance(cursor);
|
|
}
|
|
|
|
/* matches not, relay on the parent */
|
|
if (!found) {
|
|
cursor->curr = curr_snap;
|
|
cursor->pos = start;
|
|
return -1;
|
|
}
|
|
|
|
matches = cursor->pos - start;
|
|
|
|
/* we match only a part of the node. Split it and add the new chain */
|
|
if (matches < root->val_nr) {
|
|
split_add_child(root, cursor, cnode, start, matches, period);
|
|
return 0;
|
|
}
|
|
|
|
/* we match 100% of the path, increment the hit */
|
|
if (matches == root->val_nr && cursor->pos == cursor->nr) {
|
|
root->hit += period;
|
|
return 0;
|
|
}
|
|
|
|
/* We match the node and still have a part remaining */
|
|
append_chain_children(root, cursor, period);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int callchain_append(struct callchain_root *root,
|
|
struct callchain_cursor *cursor,
|
|
u64 period)
|
|
{
|
|
if (!cursor->nr)
|
|
return 0;
|
|
|
|
callchain_cursor_commit(cursor);
|
|
|
|
append_chain_children(&root->node, cursor, period);
|
|
|
|
if (cursor->nr > root->max_depth)
|
|
root->max_depth = cursor->nr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
merge_chain_branch(struct callchain_cursor *cursor,
|
|
struct callchain_node *dst, struct callchain_node *src)
|
|
{
|
|
struct callchain_cursor_node **old_last = cursor->last;
|
|
struct callchain_node *child, *next_child;
|
|
struct callchain_list *list, *next_list;
|
|
int old_pos = cursor->nr;
|
|
int err = 0;
|
|
|
|
list_for_each_entry_safe(list, next_list, &src->val, list) {
|
|
callchain_cursor_append(cursor, list->ip,
|
|
list->ms.map, list->ms.sym);
|
|
list_del(&list->list);
|
|
free(list);
|
|
}
|
|
|
|
if (src->hit) {
|
|
callchain_cursor_commit(cursor);
|
|
append_chain_children(dst, cursor, src->hit);
|
|
}
|
|
|
|
chain_for_each_child_safe(child, next_child, src) {
|
|
err = merge_chain_branch(cursor, dst, child);
|
|
if (err)
|
|
break;
|
|
|
|
list_del(&child->siblings);
|
|
free(child);
|
|
}
|
|
|
|
cursor->nr = old_pos;
|
|
cursor->last = old_last;
|
|
|
|
return err;
|
|
}
|
|
|
|
int callchain_merge(struct callchain_cursor *cursor,
|
|
struct callchain_root *dst, struct callchain_root *src)
|
|
{
|
|
return merge_chain_branch(cursor, &dst->node, &src->node);
|
|
}
|
|
|
|
int callchain_cursor_append(struct callchain_cursor *cursor,
|
|
u64 ip, struct map *map, struct symbol *sym)
|
|
{
|
|
struct callchain_cursor_node *node = *cursor->last;
|
|
|
|
if (!node) {
|
|
node = calloc(1, sizeof(*node));
|
|
if (!node)
|
|
return -ENOMEM;
|
|
|
|
*cursor->last = node;
|
|
}
|
|
|
|
node->ip = ip;
|
|
node->map = map;
|
|
node->sym = sym;
|
|
|
|
cursor->nr++;
|
|
|
|
cursor->last = &node->next;
|
|
|
|
return 0;
|
|
}
|