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/*
* Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License (not later!)
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "event-parse.h"
#include "event-utils.h"
#include "trace-seq.h"
static struct func_stack {
int size;
char **stack;
} *fstack;
static int cpus = -1;
#define STK_BLK 10
struct tep_plugin_option plugin_options[] =
{
{
.name = "parent",
.plugin_alias = "ftrace",
.description =
"Print parent of functions for function events",
},
{
.name = "indent",
.plugin_alias = "ftrace",
.description =
"Try to show function call indents, based on parents",
.set = 1,
},
{
.name = NULL,
}
};
static struct tep_plugin_option *ftrace_parent = &plugin_options[0];
static struct tep_plugin_option *ftrace_indent = &plugin_options[1];
static void add_child(struct func_stack *stack, const char *child, int pos)
{
int i;
if (!child)
return;
if (pos < stack->size)
free(stack->stack[pos]);
else {
char **ptr;
ptr = realloc(stack->stack, sizeof(char *) *
(stack->size + STK_BLK));
if (!ptr) {
warning("could not allocate plugin memory\n");
return;
}
stack->stack = ptr;
for (i = stack->size; i < stack->size + STK_BLK; i++)
stack->stack[i] = NULL;
stack->size += STK_BLK;
}
stack->stack[pos] = strdup(child);
}
static int add_and_get_index(const char *parent, const char *child, int cpu)
{
int i;
if (cpu < 0)
return 0;
if (cpu > cpus) {
struct func_stack *ptr;
ptr = realloc(fstack, sizeof(*fstack) * (cpu + 1));
if (!ptr) {
warning("could not allocate plugin memory\n");
return 0;
}
fstack = ptr;
/* Account for holes in the cpu count */
for (i = cpus + 1; i <= cpu; i++)
memset(&fstack[i], 0, sizeof(fstack[i]));
cpus = cpu;
}
for (i = 0; i < fstack[cpu].size && fstack[cpu].stack[i]; i++) {
if (strcmp(parent, fstack[cpu].stack[i]) == 0) {
add_child(&fstack[cpu], child, i+1);
return i;
}
}
/* Not found */
add_child(&fstack[cpu], parent, 0);
add_child(&fstack[cpu], child, 1);
return 0;
}
static int function_handler(struct trace_seq *s, struct tep_record *record,
struct tep_event *event, void *context)
{
struct tep_handle *tep = event->tep;
unsigned long long function;
unsigned long long pfunction;
const char *func;
const char *parent;
int index = 0;
if (tep_get_field_val(s, event, "ip", record, &function, 1))
return trace_seq_putc(s, '!');
func = tep_find_function(tep, function);
if (tep_get_field_val(s, event, "parent_ip", record, &pfunction, 1))
return trace_seq_putc(s, '!');
parent = tep_find_function(tep, pfunction);
if (parent && ftrace_indent->set)
index = add_and_get_index(parent, func, record->cpu);
trace_seq_printf(s, "%*s", index*3, "");
if (func)
trace_seq_printf(s, "%s", func);
else
trace_seq_printf(s, "0x%llx", function);
if (ftrace_parent->set) {
trace_seq_printf(s, " <-- ");
if (parent)
trace_seq_printf(s, "%s", parent);
else
trace_seq_printf(s, "0x%llx", pfunction);
}
return 0;
}
int TEP_PLUGIN_LOADER(struct tep_handle *tep)
{
tep_register_event_handler(tep, -1, "ftrace", "function",
function_handler, NULL);
tep_plugin_add_options("ftrace", plugin_options);
return 0;
}
void TEP_PLUGIN_UNLOADER(struct tep_handle *tep)
{
int i, x;
tep_unregister_event_handler(tep, -1, "ftrace", "function",
function_handler, NULL);
for (i = 0; i <= cpus; i++) {
for (x = 0; x < fstack[i].size && fstack[i].stack[x]; x++)
free(fstack[i].stack[x]);
free(fstack[i].stack);
}
tep_plugin_remove_options(plugin_options);
free(fstack);
fstack = NULL;
cpus = -1;
}
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