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Diffstat (limited to 'tools/perf/builtin-ftrace.c')
-rw-r--r--tools/perf/builtin-ftrace.c159
1 files changed, 149 insertions, 10 deletions
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 9e0b35cd0eea..dd26c62c9893 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -28,9 +28,19 @@
#define DEFAULT_TRACER "function_graph"
struct perf_ftrace {
- struct perf_evlist *evlist;
- struct target target;
- const char *tracer;
+ struct perf_evlist *evlist;
+ struct target target;
+ const char *tracer;
+ struct list_head filters;
+ struct list_head notrace;
+ struct list_head graph_funcs;
+ struct list_head nograph_funcs;
+ int graph_depth;
+};
+
+struct filter_entry {
+ struct list_head list;
+ char name[];
};
static bool done;
@@ -61,6 +71,7 @@ static int __write_tracing_file(const char *name, const char *val, bool append)
int fd, ret = -1;
ssize_t size = strlen(val);
int flags = O_WRONLY;
+ char errbuf[512];
file = get_tracing_file(name);
if (!file) {
@@ -75,14 +86,16 @@ static int __write_tracing_file(const char *name, const char *val, bool append)
fd = open(file, flags);
if (fd < 0) {
- pr_debug("cannot open tracing file: %s\n", name);
+ pr_debug("cannot open tracing file: %s: %s\n",
+ name, str_error_r(errno, errbuf, sizeof(errbuf)));
goto out;
}
if (write(fd, val, size) == size)
ret = 0;
else
- pr_debug("write '%s' to tracing/%s failed\n", val, name);
+ pr_debug("write '%s' to tracing/%s failed: %s\n",
+ val, name, str_error_r(errno, errbuf, sizeof(errbuf)));
close(fd);
out:
@@ -101,6 +114,7 @@ static int append_tracing_file(const char *name, const char *val)
}
static int reset_tracing_cpu(void);
+static void reset_tracing_filters(void);
static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
{
@@ -116,6 +130,10 @@ static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
if (reset_tracing_cpu() < 0)
return -1;
+ if (write_tracing_file("max_graph_depth", "0") < 0)
+ return -1;
+
+ reset_tracing_filters();
return 0;
}
@@ -181,6 +199,68 @@ static int reset_tracing_cpu(void)
return ret;
}
+static int __set_tracing_filter(const char *filter_file, struct list_head *funcs)
+{
+ struct filter_entry *pos;
+
+ list_for_each_entry(pos, funcs, list) {
+ if (append_tracing_file(filter_file, pos->name) < 0)
+ return -1;
+ }
+
+ return 0;
+}
+
+static int set_tracing_filters(struct perf_ftrace *ftrace)
+{
+ int ret;
+
+ ret = __set_tracing_filter("set_ftrace_filter", &ftrace->filters);
+ if (ret < 0)
+ return ret;
+
+ ret = __set_tracing_filter("set_ftrace_notrace", &ftrace->notrace);
+ if (ret < 0)
+ return ret;
+
+ ret = __set_tracing_filter("set_graph_function", &ftrace->graph_funcs);
+ if (ret < 0)
+ return ret;
+
+ /* old kernels do not have this filter */
+ __set_tracing_filter("set_graph_notrace", &ftrace->nograph_funcs);
+
+ return ret;
+}
+
+static void reset_tracing_filters(void)
+{
+ write_tracing_file("set_ftrace_filter", " ");
+ write_tracing_file("set_ftrace_notrace", " ");
+ write_tracing_file("set_graph_function", " ");
+ write_tracing_file("set_graph_notrace", " ");
+}
+
+static int set_tracing_depth(struct perf_ftrace *ftrace)
+{
+ char buf[16];
+
+ if (ftrace->graph_depth == 0)
+ return 0;
+
+ if (ftrace->graph_depth < 0) {
+ pr_err("invalid graph depth: %d\n", ftrace->graph_depth);
+ return -1;
+ }
+
+ snprintf(buf, sizeof(buf), "%d", ftrace->graph_depth);
+
+ if (write_tracing_file("max_graph_depth", buf) < 0)
+ return -1;
+
+ return 0;
+}
+
static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
{
char *trace_file;
@@ -223,11 +303,23 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
goto out_reset;
}
+ if (set_tracing_filters(ftrace) < 0) {
+ pr_err("failed to set tracing filters\n");
+ goto out_reset;
+ }
+
+ if (set_tracing_depth(ftrace) < 0) {
+ pr_err("failed to set graph depth\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;
}
+ setup_pager();
+
trace_file = get_tracing_file("trace_pipe");
if (!trace_file) {
pr_err("failed to open trace_pipe\n");
@@ -251,8 +343,6 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
goto out_close_fd;
}
- setup_pager();
-
perf_evlist__start_workload(ftrace->evlist);
while (!done) {
@@ -307,6 +397,32 @@ static int perf_ftrace_config(const char *var, const char *value, void *cb)
return -1;
}
+static int parse_filter_func(const struct option *opt, const char *str,
+ int unset __maybe_unused)
+{
+ struct list_head *head = opt->value;
+ struct filter_entry *entry;
+
+ entry = malloc(sizeof(*entry) + strlen(str) + 1);
+ if (entry == NULL)
+ return -ENOMEM;
+
+ strcpy(entry->name, str);
+ list_add_tail(&entry->list, head);
+
+ return 0;
+}
+
+static void delete_filter_func(struct list_head *head)
+{
+ struct filter_entry *pos, *tmp;
+
+ list_for_each_entry_safe(pos, tmp, head, list) {
+ list_del(&pos->list);
+ free(pos);
+ }
+}
+
int cmd_ftrace(int argc, const char **argv)
{
int ret;
@@ -330,9 +446,24 @@ int cmd_ftrace(int argc, const char **argv)
"system-wide collection from all CPUs"),
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),
+ OPT_CALLBACK('N', "notrace-funcs", &ftrace.notrace, "func",
+ "do not trace given functions", parse_filter_func),
+ OPT_CALLBACK('G', "graph-funcs", &ftrace.graph_funcs, "func",
+ "Set graph filter on given functions", 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_END()
};
+ INIT_LIST_HEAD(&ftrace.filters);
+ INIT_LIST_HEAD(&ftrace.notrace);
+ INIT_LIST_HEAD(&ftrace.graph_funcs);
+ INIT_LIST_HEAD(&ftrace.nograph_funcs);
+
ret = perf_config(perf_ftrace_config, &ftrace);
if (ret < 0)
return -1;
@@ -348,12 +479,14 @@ int cmd_ftrace(int argc, const char **argv)
target__strerror(&ftrace.target, ret, errbuf, 512);
pr_err("%s\n", errbuf);
- return -EINVAL;
+ goto out_delete_filters;
}
ftrace.evlist = perf_evlist__new();
- if (ftrace.evlist == NULL)
- return -ENOMEM;
+ if (ftrace.evlist == NULL) {
+ ret = -ENOMEM;
+ goto out_delete_filters;
+ }
ret = perf_evlist__create_maps(ftrace.evlist, &ftrace.target);
if (ret < 0)
@@ -364,5 +497,11 @@ int cmd_ftrace(int argc, const char **argv)
out_delete_evlist:
perf_evlist__delete(ftrace.evlist);
+out_delete_filters:
+ delete_filter_func(&ftrace.filters);
+ delete_filter_func(&ftrace.notrace);
+ delete_filter_func(&ftrace.graph_funcs);
+ delete_filter_func(&ftrace.nograph_funcs);
+
return ret;
}