Commit 07a180a0 authored Dec 03, 2013 by Jiri Olsa Committed by Arnaldo Carvalho de Melo Dec 04, 2013

tools lib traceevent: Add function plugin

Backporting function plugin.

Backported from Steven Rostedt's trace-cmd repo (HEAD 0f2c2fb):
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git



This plugin adds function and parent function fields resolving for
ftrace:function tracepoint event.

The diff of 'perf script' output generated by old and new code:
(data was generated by 'perf record -e ftrace:function ls')

  --- script.function.old
  +++ script.function.new
  -              ls 10781 [001] 32667.291379: ftrace:function:  ffffffff811adb80 <-- ffffffff811afc48
  -              ls 10781 [001] 32667.291379: ftrace:function:  ffffffff811b35d0 <-- ffffffff811adb9b
  -              ls 10781 [001] 32667.291380: ftrace:function:  ffffffff811b3520 <-- ffffffff811b35e8
  -              ls 10781 [001] 32667.291380: ftrace:function:  ffffffff811b2720 <-- ffffffff811b3549
  -              ls 10781 [001] 32667.291381: ftrace:function:  ffffffff81297e10 <-- ffffffff811b356c
  -              ls 10781 [001] 32667.291381: ftrace:function:  ffffffff81298f40 <-- ffffffff81297e2c
  -              ls 10781 [001] 32667.291382: ftrace:function:  ffffffff81076160 <-- ffffffff811afbf0
  -              ls 10781 [001] 32667.291383: ftrace:function:  ffffffff811c3eb0 <-- ffffffff811afbfc
  -              ls 10781 [001] 32667.291383: ftrace:function:  ffffffff8164e100 <-- ffffffff811c3ed8
  -              ls 10781 [001] 32667.291384: ftrace:function:  ffffffff811a5d10 <-- ffffffff811c3f53
  -              ls 10781 [001] 32667.291384: ftrace:function:  ffffffff811e8e70 <-- ffffffff811a5d58
  -              ls 10781 [001] 32667.291385: ftrace:function:  ffffffff811f38e0 <-- ffffffff811a5d63
  -              ls 10781 [001] 32667.291385: ftrace:function:  ffffffff811a9ff0 <-- ffffffff811a5d6b
  -              ls 10781 [001] 32667.291386: ftrace:function:  ffffffff811a9fa0 <-- ffffffff811aa015
  -              ls 10781 [001] 32667.291387: ftrace:function:  ffffffff810851c0 <-- ffffffff811aa053
  -              ls 10781 [001] 32667.291387: ftrace:function:  ffffffff81090e00 <-- ffffffff81085211
  +              ls 10781 [001] 32667.291379: ftrace:function: would_dump <-- setup_new_exec
  +              ls 10781 [001] 32667.291379: ftrace:function:    inode_permission <-- would_dump
  +              ls 10781 [001] 32667.291380: ftrace:function:       __inode_permission <-- inode_permission
  +              ls 10781 [001] 32667.291380: ftrace:function:          generic_permission <-- __inode_permission
  +              ls 10781 [001] 32667.291381: ftrace:function:          security_inode_permission <-- __inode_permission
  +              ls 10781 [001] 32667.291381: ftrace:function:             cap_inode_permission <-- security_inode_permission
  +              ls 10781 [001] 32667.291382: ftrace:function: flush_signal_handlers <-- setup_new_exec
  +              ls 10781 [001] 32667.291383: ftrace:function: do_close_on_exec <-- setup_new_exec
  +              ls 10781 [001] 32667.291383: ftrace:function:    _raw_spin_lock <-- do_close_on_exec
  +              ls 10781 [001] 32667.291384: ftrace:function:    filp_close <-- do_close_on_exec
  +              ls 10781 [001] 32667.291384: ftrace:function:       dnotify_flush <-- filp_close
  +              ls 10781 [001] 32667.291385: ftrace:function:       locks_remove_posix <-- filp_close
  +              ls 10781 [001] 32667.291385: ftrace:function:       fput <-- filp_close
  +              ls 10781 [001] 32667.291386: ftrace:function:          file_sb_list_del <-- fput
  +              ls 10781 [001] 32667.291387: ftrace:function:          task_work_add <-- fput
  +              ls 10781 [001] 32667.291387: ftrace:function:             kick_process <-- task_work_add

Removing options support as it's not backported yet.
Currently this plugin supports 2 options:
 'parent' to display parent function
 'indent' to show function call indents

Enabling both of them by default.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1386076182-14484-19-git-send-email-jolsa@redhat.com


Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent 83e815ee

tools/lib/traceevent/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -218,6 +218,7 @@ PLUGIN_OBJS += plugin_kmem.o
		PLUGIN_OBJS += plugin_kvm.o
		PLUGIN_OBJS += plugin_mac80211.o
		PLUGIN_OBJS += plugin_sched_switch.o
		PLUGIN_OBJS += plugin_function.o

		PLUGINS := $(PLUGIN_OBJS:.o=.so)

tools/lib/traceevent/plugin_function.c

0 → 100644

+151 −0

Original line number	Diff line number	Diff line
		/*
		* 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"

		static struct func_stack {
		int index;
		int size;
		char **stack;
		} *fstack;

		static int cpus = -1;

		#define STK_BLK 10

		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 {
		if (!stack->stack)
		stack->stack = malloc_or_die(sizeof(char ) STK_BLK);
		else
		stack->stack = realloc(stack->stack, sizeof(char )
		(stack->size + STK_BLK));
		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 get_index(const char parent, const char child, int cpu)
		{
		int i;

		if (cpu < 0)
		return 0;

		if (cpu > cpus) {
		if (fstack)
		fstack = realloc(fstack, sizeof(fstack) (cpu + 1));
		else
		fstack = malloc_or_die(sizeof(fstack) (cpu + 1));

		/* 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 pevent_record record,
		struct event_format event, void context)
		{
		struct pevent *pevent = event->pevent;
		unsigned long long function;
		unsigned long long pfunction;
		const char *func;
		const char *parent;
		int i, index;

		if (pevent_get_field_val(s, event, "ip", record, &function, 1))
		return trace_seq_putc(s, '!');

		func = pevent_find_function(pevent, function);

		if (pevent_get_field_val(s, event, "parent_ip", record, &pfunction, 1))
		return trace_seq_putc(s, '!');

		parent = pevent_find_function(pevent, pfunction);

		index = get_index(parent, func, record->cpu);

		for (i = 0; i < index; i++)
		trace_seq_printf(s, " ");

		if (func)
		trace_seq_printf(s, "%s", func);
		else
		trace_seq_printf(s, "0x%llx", function);

		trace_seq_printf(s, " <-- ");
		if (parent)
		trace_seq_printf(s, "%s", parent);
		else
		trace_seq_printf(s, "0x%llx", pfunction);

		return 0;
		}

		int PEVENT_PLUGIN_LOADER(struct pevent *pevent)
		{
		pevent_register_event_handler(pevent, -1, "ftrace", "function",
		function_handler, NULL);
		return 0;
		}

		void PEVENT_PLUGIN_UNLOADER(void)
		{
		int i, x;

		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);
		}

		free(fstack);
		fstack = NULL;
		cpus = -1;
		}