#include "thread_map.h"
#include "util/cap.h"
#include "util/config.h"
+#include "util/units.h"
+#include "util/parse-sublevel-options.h"
#define DEFAULT_TRACER "function_graph"
struct evlist *evlist;
struct target target;
const char *tracer;
+ bool list_avail_functions;
struct list_head filters;
struct list_head notrace;
struct list_head graph_funcs;
struct list_head nograph_funcs;
int graph_depth;
+ unsigned long percpu_buffer_size;
+ bool inherit;
+ int func_stack_trace;
+ int func_irq_info;
+ int graph_nosleep_time;
+ int graph_noirqs;
};
struct filter_entry {
return __write_tracing_file(name, val, true);
}
+static int read_tracing_file_to_stdout(const char *name)
+{
+ char buf[4096];
+ char *file;
+ int fd;
+ int ret = -1;
+
+ file = get_tracing_file(name);
+ if (!file) {
+ pr_debug("cannot get tracing file: %s\n", name);
+ return -1;
+ }
+
+ fd = open(file, O_RDONLY);
+ if (fd < 0) {
+ pr_debug("cannot open tracing file: %s: %s\n",
+ name, str_error_r(errno, buf, sizeof(buf)));
+ goto out;
+ }
+
+ /* read contents to stdout */
+ while (true) {
+ int n = read(fd, buf, sizeof(buf));
+ if (n == 0)
+ break;
+ else if (n < 0)
+ goto out_close;
+
+ if (fwrite(buf, n, 1, stdout) != 1)
+ goto out_close;
+ }
+ ret = 0;
+
+out_close:
+ close(fd);
+out:
+ put_tracing_file(file);
+ return ret;
+}
+
+static int write_tracing_file_int(const char *name, int value)
+{
+ char buf[16];
+
+ snprintf(buf, sizeof(buf), "%d", value);
+ if (write_tracing_file(name, buf) < 0)
+ return -1;
+
+ return 0;
+}
+
+static int write_tracing_option_file(const char *name, const char *val)
+{
+ char *file;
+ int ret;
+
+ if (asprintf(&file, "options/%s", name) < 0)
+ return -1;
+
+ ret = __write_tracing_file(file, val, false);
+ free(file);
+ return ret;
+}
+
static int reset_tracing_cpu(void);
static void reset_tracing_filters(void);
+static void reset_tracing_options(struct perf_ftrace *ftrace __maybe_unused)
+{
+ write_tracing_option_file("function-fork", "0");
+ 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)
{
if (write_tracing_file("tracing_on", "0") < 0)
return -1;
reset_tracing_filters();
+ reset_tracing_options(ftrace);
return 0;
}
return set_tracing_cpumask(cpumap);
}
+static int set_tracing_func_stack_trace(struct perf_ftrace *ftrace)
+{
+ if (!ftrace->func_stack_trace)
+ return 0;
+
+ if (write_tracing_option_file("func_stack_trace", "1") < 0)
+ return -1;
+
+ 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);
static int set_tracing_depth(struct perf_ftrace *ftrace)
{
- char buf[16];
-
if (ftrace->graph_depth == 0)
return 0;
return -1;
}
- snprintf(buf, sizeof(buf), "%d", ftrace->graph_depth);
+ if (write_tracing_file_int("max_graph_depth", ftrace->graph_depth) < 0)
+ return -1;
+
+ return 0;
+}
+
+static int set_tracing_percpu_buffer_size(struct perf_ftrace *ftrace)
+{
+ int ret;
+
+ if (ftrace->percpu_buffer_size == 0)
+ return 0;
+
+ ret = write_tracing_file_int("buffer_size_kb",
+ ftrace->percpu_buffer_size / 1024);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int set_tracing_trace_inherit(struct perf_ftrace *ftrace)
+{
+ if (!ftrace->inherit)
+ return 0;
+
+ if (write_tracing_option_file("function-fork", "1") < 0)
+ return -1;
+
+ return 0;
+}
+
+static int set_tracing_sleep_time(struct perf_ftrace *ftrace)
+{
+ if (!ftrace->graph_nosleep_time)
+ return 0;
+
+ if (write_tracing_option_file("sleep-time", "0") < 0)
+ return -1;
+
+ return 0;
+}
+
+static int set_tracing_funcgraph_irqs(struct perf_ftrace *ftrace)
+{
+ if (!ftrace->graph_noirqs)
+ return 0;
- if (write_tracing_file("max_graph_depth", buf) < 0)
+ if (write_tracing_option_file("funcgraph-irqs", "0") < 0)
return -1;
return 0;
signal(SIGCHLD, sig_handler);
signal(SIGPIPE, sig_handler);
+ if (ftrace->list_avail_functions)
+ return read_tracing_file_to_stdout("available_filter_functions");
+
if (reset_tracing_files(ftrace) < 0) {
pr_err("failed to reset ftrace\n");
goto out;
goto out_reset;
}
+ if (set_tracing_func_stack_trace(ftrace) < 0) {
+ pr_err("failed to set tracing option func_stack_trace\n");
+ 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;
goto out_reset;
}
+ if (set_tracing_percpu_buffer_size(ftrace) < 0) {
+ pr_err("failed to set tracing per-cpu buffer size\n");
+ goto out_reset;
+ }
+
+ if (set_tracing_trace_inherit(ftrace) < 0) {
+ pr_err("failed to set tracing option function-fork\n");
+ goto out_reset;
+ }
+
+ if (set_tracing_sleep_time(ftrace) < 0) {
+ pr_err("failed to set tracing option sleep-time\n");
+ goto out_reset;
+ }
+
+ if (set_tracing_funcgraph_irqs(ftrace) < 0) {
+ pr_err("failed to set tracing option funcgraph-irqs\n");
+ goto out_reset;
+ }
+
if (write_tracing_file("current_tracer", ftrace->tracer) < 0) {
pr_err("failed to set current_tracer to %s\n", ftrace->tracer);
goto out_reset;
fcntl(trace_fd, F_SETFL, O_NONBLOCK);
pollfd.fd = trace_fd;
+ /* display column headers */
+ read_tracing_file_to_stdout("trace");
+
if (write_tracing_file("tracing_on", "1") < 0) {
pr_err("can't enable tracing\n");
goto out_close_fd;
}
}
+static int parse_buffer_size(const struct option *opt,
+ const char *str, int unset)
+{
+ unsigned long *s = (unsigned long *)opt->value;
+ static struct parse_tag tags_size[] = {
+ { .tag = 'B', .mult = 1 },
+ { .tag = 'K', .mult = 1 << 10 },
+ { .tag = 'M', .mult = 1 << 20 },
+ { .tag = 'G', .mult = 1 << 30 },
+ { .tag = 0 },
+ };
+ unsigned long val;
+
+ if (unset) {
+ *s = 0;
+ return 0;
+ }
+
+ val = parse_tag_value(str, tags_size);
+ if (val != (unsigned long) -1) {
+ if (val < 1024) {
+ pr_err("buffer size too small, must larger than 1KB.");
+ return -1;
+ }
+ *s = val;
+ return 0;
+ }
+
+ return -1;
+}
+
+static int parse_func_tracer_opts(const struct option *opt,
+ const char *str, int unset)
+{
+ int ret;
+ 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, }
+ };
+
+ if (unset)
+ return 0;
+
+ ret = perf_parse_sublevel_options(str, func_tracer_opts);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int parse_graph_tracer_opts(const struct option *opt,
+ const char *str, int unset)
+{
+ int ret;
+ struct perf_ftrace *ftrace = (struct perf_ftrace *) opt->value;
+ struct sublevel_option graph_tracer_opts[] = {
+ { .name = "nosleep-time", .value_ptr = &ftrace->graph_nosleep_time },
+ { .name = "noirqs", .value_ptr = &ftrace->graph_noirqs },
+ { .name = NULL, }
+ };
+
+ if (unset)
+ return 0;
+
+ ret = perf_parse_sublevel_options(str, graph_tracer_opts);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void select_tracer(struct perf_ftrace *ftrace)
+{
+ bool graph = !list_empty(&ftrace->graph_funcs) ||
+ !list_empty(&ftrace->nograph_funcs);
+ bool func = !list_empty(&ftrace->filters) ||
+ !list_empty(&ftrace->notrace);
+
+ /* The function_graph has priority over function tracer. */
+ if (graph)
+ ftrace->tracer = "function_graph";
+ else if (func)
+ ftrace->tracer = "function";
+ /* Otherwise, the default tracer is used. */
+
+ pr_debug("%s tracer is used\n", ftrace->tracer);
+}
+
int cmd_ftrace(int argc, const char **argv)
{
int ret;
const struct option ftrace_options[] = {
OPT_STRING('t', "tracer", &ftrace.tracer, "tracer",
"tracer to use: function_graph(default) or function"),
+ OPT_BOOLEAN('F', "funcs", &ftrace.list_avail_functions,
+ "Show available functions to filter"),
OPT_STRING('p', "pid", &ftrace.target.pid, "pid",
"trace on existing process id"),
OPT_INCR('v', "verbose", &verbose,
OPT_STRING('C', "cpu", &ftrace.target.cpu_list, "cpu",
"list of cpus to monitor"),
OPT_CALLBACK('T', "trace-funcs", &ftrace.filters, "func",
- "trace given functions only", parse_filter_func),
+ "trace given functions using function tracer",
+ parse_filter_func),
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,irq-info",
+ parse_func_tracer_opts),
OPT_CALLBACK('G', "graph-funcs", &ftrace.graph_funcs, "func",
- "Set graph filter on given functions", parse_filter_func),
+ "trace given functions using function_graph tracer",
+ parse_filter_func),
OPT_CALLBACK('g', "nograph-funcs", &ftrace.nograph_funcs, "func",
"Set nograph filter on given functions", parse_filter_func),
OPT_INTEGER('D', "graph-depth", &ftrace.graph_depth,
"Max depth for function graph tracer"),
+ OPT_CALLBACK(0, "graph-opts", &ftrace, "options",
+ "graph tracer options, available options: nosleep-time,noirqs",
+ parse_graph_tracer_opts),
+ OPT_CALLBACK('m', "buffer-size", &ftrace.percpu_buffer_size, "size",
+ "size of per cpu buffer", parse_buffer_size),
+ OPT_BOOLEAN(0, "inherit", &ftrace.inherit,
+ "trace children processes"),
OPT_END()
};
if (!argc && target__none(&ftrace.target))
ftrace.target.system_wide = true;
+ select_tracer(&ftrace);
+
ret = target__validate(&ftrace.target);
if (ret) {
char errbuf[512];
projects / linux-2.6-microblaze.git / blobdiff