Backporting function plugin. Signed-off-by: Jiri Olsa <jo...@redhat.com> Cc: Corey Ashford <cjash...@linux.vnet.ibm.com> Cc: Frederic Weisbecker <fweis...@gmail.com> Cc: Ingo Molnar <mi...@elte.hu> Cc: Namhyung Kim <namhy...@kernel.org> Cc: Paul Mackerras <pau...@samba.org> Cc: Peter Zijlstra <a.p.zijls...@chello.nl> Cc: Arnaldo Carvalho de Melo <a...@redhat.com> Cc: Steven Rostedt <rost...@goodmis.org> Cc: David Ahern <dsah...@gmail.com> --- tools/lib/traceevent/Makefile | 2 +- tools/lib/traceevent/plugin_function.c | 182 +++++++++++++++++++++++++++++++++ 2 files changed, 183 insertions(+), 1 deletion(-) create mode 100644 tools/lib/traceevent/plugin_function.c
diff --git a/tools/lib/traceevent/Makefile b/tools/lib/traceevent/Makefile index 3a5ffd3..c926d09 100644 --- a/tools/lib/traceevent/Makefile +++ b/tools/lib/traceevent/Makefile @@ -209,7 +209,7 @@ PEVENT_LIB_OBJS = event-parse.o event-plugin.o trace-seq.o parse-filter.o parse- PEVENT_LIB_OBJS += kbuffer-parse.o PLUGIN_OBJS = plugin_jbd2.o plugin_blk.o plugin_hrtimer.o plugin_kmem.o plugin_kvm.o \ - plugin_mac80211.o plugin_sched_switch.o + plugin_mac80211.o plugin_sched_switch.o 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..d0444ba --- /dev/null +++ b/tools/lib/traceevent/plugin_function.c @@ -0,0 +1,182 @@ +/* + * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srost...@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 + +struct 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 plugin_option *ftrace_parent = &plugin_options[0]; +static struct 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 { + 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 = 0; + + 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); + + if (ftrace_indent->set) + 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); + + 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 PEVENT_PLUGIN_LOADER(struct pevent *pevent) +{ + pevent_register_event_handler(pevent, -1, "ftrace", "function", + function_handler, NULL); + + traceevent_add_options("ftrace", plugin_options); + + 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); + } + + traceevent_remove_options(plugin_options); + + free(fstack); + fstack = NULL; + cpus = -1; +} -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
