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perf ftrace: Add support for tracing option 'irq-info' 

This adds support to display irq context info for function tracer. To do
this, just specify a '--func-opts irq-info' option.

Signed-off-by: Changbin Du <changbin.du@gmail.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Link: http://lore.kernel.org/lkml/20200808023141.14227-12-changbin.du@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Changbin Du 2020-08-08 10:31:34 +08:00 committed by Arnaldo Carvalho de Melo
parent d1bcf17cda
commit c81fc34e31
2 changed files with 21 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
tools/perf/Documentation/perf-ftrace.txt
View File

@ -79,6 +79,7 @@ OPTIONS
--func-opts::
List of options allowed to set:
call-graph - Display kernel stack trace for function tracer.
irq-info - Display irq context info for function tracer.
-G::
--graph-funcs=::

21
tools/perf/builtin-ftrace.c
View File

@ -44,6 +44,7 @@ struct perf_ftrace {
unsigned long percpu_buffer_size;
bool inherit;
int func_stack_trace;
int func_irq_info;
int graph_nosleep_time;
int graph_noirqs;
};
@ -209,6 +210,7 @@ static void reset_tracing_options(struct perf_ftrace *ftrace __maybe_unused)
write_tracing_option_file("func_stack_trace", "0");
write_tracing_option_file("sleep-time", "1");
write_tracing_option_file("funcgraph-irqs", "1");
write_tracing_option_file("irq-info", "0");
}
static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
@ -296,6 +298,17 @@ static int set_tracing_func_stack_trace(struct perf_ftrace *ftrace)
return 0;
}
static int set_tracing_func_irqinfo(struct perf_ftrace *ftrace)
{
if (!ftrace->func_irq_info)
return 0;
if (write_tracing_option_file("irq-info", "1") < 0)
return -1;
return 0;
}
static int reset_tracing_cpu(void)
{
struct perf_cpu_map *cpumap = perf_cpu_map__new(NULL);
@ -471,6 +484,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
goto out_reset;
}
if (set_tracing_func_irqinfo(ftrace) < 0) {
pr_err("failed to set tracing option irq-info\n");
goto out_reset;
}
if (set_tracing_filters(ftrace) < 0) {
pr_err("failed to set tracing filters\n");
goto out_reset;
@ -660,6 +678,7 @@ static int parse_func_tracer_opts(const struct option *opt,
struct perf_ftrace *ftrace = (struct perf_ftrace *) opt->value;
struct sublevel_option func_tracer_opts[] = {
{ .name = "call-graph", .value_ptr = &ftrace->func_stack_trace },
{ .name = "irq-info", .value_ptr = &ftrace->func_irq_info },
{ .name = NULL, }
};
@ -742,7 +761,7 @@ int cmd_ftrace(int argc, const char **argv)
OPT_CALLBACK('N', "notrace-funcs", &ftrace.notrace, "func",
"do not trace given functions", parse_filter_func),
OPT_CALLBACK(0, "func-opts", &ftrace, "options",
"function tracer options, available options: call-graph",
"function tracer options, available options: call-graph,irq-info",
parse_func_tracer_opts),
OPT_CALLBACK('G', "graph-funcs", &ftrace.graph_funcs, "func",
"trace given functions using function_graph tracer",