[PATCH 12/29] tools lib traceevent: Add function plugin

Jiri Olsa
2013-11-28T11:34:22Z

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: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.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: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: David Ahern <dsahern@gmail.com>
---
tools/lib/traceevent/Makefile | 1 +
tools/lib/traceevent/plugin_function.c | 151 +++++++++++++++++++++++++++++++++
2 files changed, 152 insertions(+)
create mode 100644 tools/lib/traceevent/plugin_function.c

diff --git a/tools/lib/traceevent/Makefile b/tools/lib/traceevent/Makefile
index 726e9bb..63ef6c8 100644
--- a/tools/lib/traceevent/Makefile
+++ b/tools/lib/traceevent/Makefile
@@ -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)

diff --git a/tools/lib/traceevent/plugin_function.c b/tools/lib/traceevent/plugin_function.c
new file mode 100644
index 0000000..8deb22e
--- /dev/null
+++ b/tools/lib/traceevent/plugin_function.c
@@ -0,0 +1,151 @@
+/*
+ * 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;
+}
--
1.8.3.1