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![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
So that we don't carry the session.h include directive in auxtrace.h, which in turn opens a can of worms of files that were getting all sorts of things via that include, fix them all. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lkml.kernel.org/n/tip-d2d83aovpgri2z75wlitquni@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
529 lines
12 KiB
C
529 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* builtin-ftrace.c
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*
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* Copyright (c) 2013 LG Electronics, Namhyung Kim <namhyung@kernel.org>
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*/
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#include "builtin.h"
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#include <errno.h>
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#include <unistd.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <poll.h>
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#include <linux/capability.h>
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#include <linux/string.h>
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#include "debug.h"
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#include <subcmd/pager.h>
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#include <subcmd/parse-options.h>
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#include <api/fs/tracing_path.h>
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#include "evlist.h"
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#include "target.h"
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#include "cpumap.h"
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#include "thread_map.h"
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#include "util/cap.h"
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#include "util/config.h"
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#define DEFAULT_TRACER "function_graph"
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struct perf_ftrace {
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struct evlist *evlist;
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struct target target;
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const char *tracer;
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struct list_head filters;
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struct list_head notrace;
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struct list_head graph_funcs;
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struct list_head nograph_funcs;
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int graph_depth;
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};
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struct filter_entry {
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struct list_head list;
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char name[];
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};
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static bool done;
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static void sig_handler(int sig __maybe_unused)
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{
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done = true;
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}
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/*
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* perf_evlist__prepare_workload will send a SIGUSR1 if the fork fails, since
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* we asked by setting its exec_error to the function below,
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* ftrace__workload_exec_failed_signal.
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*
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* XXX We need to handle this more appropriately, emitting an error, etc.
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*/
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static void ftrace__workload_exec_failed_signal(int signo __maybe_unused,
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siginfo_t *info __maybe_unused,
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void *ucontext __maybe_unused)
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{
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/* workload_exec_errno = info->si_value.sival_int; */
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done = true;
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}
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static int __write_tracing_file(const char *name, const char *val, bool append)
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{
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char *file;
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int fd, ret = -1;
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ssize_t size = strlen(val);
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int flags = O_WRONLY;
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char errbuf[512];
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char *val_copy;
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file = get_tracing_file(name);
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if (!file) {
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pr_debug("cannot get tracing file: %s\n", name);
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return -1;
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}
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if (append)
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flags |= O_APPEND;
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else
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flags |= O_TRUNC;
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fd = open(file, flags);
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if (fd < 0) {
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pr_debug("cannot open tracing file: %s: %s\n",
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name, str_error_r(errno, errbuf, sizeof(errbuf)));
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goto out;
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}
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/*
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* Copy the original value and append a '\n'. Without this,
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* the kernel can hide possible errors.
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*/
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val_copy = strdup(val);
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if (!val_copy)
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goto out_close;
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val_copy[size] = '\n';
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if (write(fd, val_copy, size + 1) == size + 1)
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ret = 0;
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else
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pr_debug("write '%s' to tracing/%s failed: %s\n",
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val, name, str_error_r(errno, errbuf, sizeof(errbuf)));
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free(val_copy);
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out_close:
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close(fd);
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out:
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put_tracing_file(file);
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return ret;
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}
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static int write_tracing_file(const char *name, const char *val)
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{
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return __write_tracing_file(name, val, false);
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}
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static int append_tracing_file(const char *name, const char *val)
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{
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return __write_tracing_file(name, val, true);
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}
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static int reset_tracing_cpu(void);
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static void reset_tracing_filters(void);
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static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
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{
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if (write_tracing_file("tracing_on", "0") < 0)
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return -1;
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if (write_tracing_file("current_tracer", "nop") < 0)
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return -1;
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if (write_tracing_file("set_ftrace_pid", " ") < 0)
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return -1;
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if (reset_tracing_cpu() < 0)
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return -1;
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if (write_tracing_file("max_graph_depth", "0") < 0)
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return -1;
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reset_tracing_filters();
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return 0;
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}
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static int set_tracing_pid(struct perf_ftrace *ftrace)
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{
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int i;
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char buf[16];
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if (target__has_cpu(&ftrace->target))
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return 0;
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for (i = 0; i < perf_thread_map__nr(ftrace->evlist->core.threads); i++) {
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scnprintf(buf, sizeof(buf), "%d",
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ftrace->evlist->core.threads->map[i]);
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if (append_tracing_file("set_ftrace_pid", buf) < 0)
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return -1;
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}
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return 0;
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}
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static int set_tracing_cpumask(struct perf_cpu_map *cpumap)
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{
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char *cpumask;
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size_t mask_size;
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int ret;
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int last_cpu;
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last_cpu = cpu_map__cpu(cpumap, cpumap->nr - 1);
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mask_size = last_cpu / 4 + 2; /* one more byte for EOS */
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mask_size += last_cpu / 32; /* ',' is needed for every 32th cpus */
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cpumask = malloc(mask_size);
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if (cpumask == NULL) {
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pr_debug("failed to allocate cpu mask\n");
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return -1;
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}
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cpu_map__snprint_mask(cpumap, cpumask, mask_size);
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ret = write_tracing_file("tracing_cpumask", cpumask);
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free(cpumask);
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return ret;
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}
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static int set_tracing_cpu(struct perf_ftrace *ftrace)
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{
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struct perf_cpu_map *cpumap = ftrace->evlist->core.cpus;
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if (!target__has_cpu(&ftrace->target))
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return 0;
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return set_tracing_cpumask(cpumap);
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}
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static int reset_tracing_cpu(void)
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{
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struct perf_cpu_map *cpumap = perf_cpu_map__new(NULL);
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int ret;
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ret = set_tracing_cpumask(cpumap);
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perf_cpu_map__put(cpumap);
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return ret;
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}
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static int __set_tracing_filter(const char *filter_file, struct list_head *funcs)
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{
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struct filter_entry *pos;
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list_for_each_entry(pos, funcs, list) {
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if (append_tracing_file(filter_file, pos->name) < 0)
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return -1;
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}
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return 0;
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}
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static int set_tracing_filters(struct perf_ftrace *ftrace)
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{
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int ret;
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ret = __set_tracing_filter("set_ftrace_filter", &ftrace->filters);
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if (ret < 0)
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return ret;
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ret = __set_tracing_filter("set_ftrace_notrace", &ftrace->notrace);
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if (ret < 0)
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return ret;
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ret = __set_tracing_filter("set_graph_function", &ftrace->graph_funcs);
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if (ret < 0)
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return ret;
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/* old kernels do not have this filter */
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__set_tracing_filter("set_graph_notrace", &ftrace->nograph_funcs);
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return ret;
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}
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static void reset_tracing_filters(void)
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{
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write_tracing_file("set_ftrace_filter", " ");
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write_tracing_file("set_ftrace_notrace", " ");
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write_tracing_file("set_graph_function", " ");
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write_tracing_file("set_graph_notrace", " ");
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}
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static int set_tracing_depth(struct perf_ftrace *ftrace)
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{
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char buf[16];
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if (ftrace->graph_depth == 0)
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return 0;
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if (ftrace->graph_depth < 0) {
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pr_err("invalid graph depth: %d\n", ftrace->graph_depth);
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return -1;
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}
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snprintf(buf, sizeof(buf), "%d", ftrace->graph_depth);
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if (write_tracing_file("max_graph_depth", buf) < 0)
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return -1;
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return 0;
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}
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static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
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{
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char *trace_file;
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int trace_fd;
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char buf[4096];
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struct pollfd pollfd = {
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.events = POLLIN,
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};
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if (!perf_cap__capable(CAP_SYS_ADMIN)) {
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pr_err("ftrace only works for %s!\n",
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#ifdef HAVE_LIBCAP_SUPPORT
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"users with the SYS_ADMIN capability"
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#else
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"root"
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#endif
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);
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return -1;
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}
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signal(SIGINT, sig_handler);
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signal(SIGUSR1, sig_handler);
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signal(SIGCHLD, sig_handler);
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signal(SIGPIPE, sig_handler);
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if (reset_tracing_files(ftrace) < 0) {
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pr_err("failed to reset ftrace\n");
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goto out;
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}
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/* reset ftrace buffer */
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if (write_tracing_file("trace", "0") < 0)
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goto out;
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if (argc && perf_evlist__prepare_workload(ftrace->evlist,
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&ftrace->target, argv, false,
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ftrace__workload_exec_failed_signal) < 0) {
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goto out;
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}
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if (set_tracing_pid(ftrace) < 0) {
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pr_err("failed to set ftrace pid\n");
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goto out_reset;
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}
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if (set_tracing_cpu(ftrace) < 0) {
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pr_err("failed to set tracing cpumask\n");
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goto out_reset;
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}
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if (set_tracing_filters(ftrace) < 0) {
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pr_err("failed to set tracing filters\n");
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goto out_reset;
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}
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if (set_tracing_depth(ftrace) < 0) {
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pr_err("failed to set graph depth\n");
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goto out_reset;
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}
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if (write_tracing_file("current_tracer", ftrace->tracer) < 0) {
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pr_err("failed to set current_tracer to %s\n", ftrace->tracer);
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goto out_reset;
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}
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setup_pager();
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trace_file = get_tracing_file("trace_pipe");
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if (!trace_file) {
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pr_err("failed to open trace_pipe\n");
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goto out_reset;
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}
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trace_fd = open(trace_file, O_RDONLY);
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put_tracing_file(trace_file);
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if (trace_fd < 0) {
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pr_err("failed to open trace_pipe\n");
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goto out_reset;
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}
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fcntl(trace_fd, F_SETFL, O_NONBLOCK);
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pollfd.fd = trace_fd;
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if (write_tracing_file("tracing_on", "1") < 0) {
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pr_err("can't enable tracing\n");
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goto out_close_fd;
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}
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perf_evlist__start_workload(ftrace->evlist);
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while (!done) {
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if (poll(&pollfd, 1, -1) < 0)
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break;
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if (pollfd.revents & POLLIN) {
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int n = read(trace_fd, buf, sizeof(buf));
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if (n < 0)
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break;
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if (fwrite(buf, n, 1, stdout) != 1)
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break;
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}
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}
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write_tracing_file("tracing_on", "0");
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/* read remaining buffer contents */
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while (true) {
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int n = read(trace_fd, buf, sizeof(buf));
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if (n <= 0)
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break;
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if (fwrite(buf, n, 1, stdout) != 1)
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break;
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}
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out_close_fd:
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close(trace_fd);
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out_reset:
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reset_tracing_files(ftrace);
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out:
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return done ? 0 : -1;
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}
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static int perf_ftrace_config(const char *var, const char *value, void *cb)
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{
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struct perf_ftrace *ftrace = cb;
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if (!strstarts(var, "ftrace."))
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return 0;
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if (strcmp(var, "ftrace.tracer"))
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return -1;
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if (!strcmp(value, "function_graph") ||
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!strcmp(value, "function")) {
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ftrace->tracer = value;
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return 0;
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}
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pr_err("Please select \"function_graph\" (default) or \"function\"\n");
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return -1;
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}
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static int parse_filter_func(const struct option *opt, const char *str,
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int unset __maybe_unused)
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{
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struct list_head *head = opt->value;
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struct filter_entry *entry;
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entry = malloc(sizeof(*entry) + strlen(str) + 1);
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if (entry == NULL)
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return -ENOMEM;
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strcpy(entry->name, str);
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list_add_tail(&entry->list, head);
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return 0;
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}
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static void delete_filter_func(struct list_head *head)
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{
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struct filter_entry *pos, *tmp;
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list_for_each_entry_safe(pos, tmp, head, list) {
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list_del_init(&pos->list);
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free(pos);
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}
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}
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int cmd_ftrace(int argc, const char **argv)
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{
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int ret;
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struct perf_ftrace ftrace = {
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.tracer = DEFAULT_TRACER,
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.target = { .uid = UINT_MAX, },
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};
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const char * const ftrace_usage[] = {
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"perf ftrace [<options>] [<command>]",
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"perf ftrace [<options>] -- <command> [<options>]",
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NULL
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};
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const struct option ftrace_options[] = {
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OPT_STRING('t', "tracer", &ftrace.tracer, "tracer",
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"tracer to use: function_graph(default) or function"),
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OPT_STRING('p', "pid", &ftrace.target.pid, "pid",
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"trace on existing process id"),
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OPT_INCR('v', "verbose", &verbose,
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"be more verbose"),
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OPT_BOOLEAN('a', "all-cpus", &ftrace.target.system_wide,
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"system-wide collection from all CPUs"),
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OPT_STRING('C', "cpu", &ftrace.target.cpu_list, "cpu",
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"list of cpus to monitor"),
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OPT_CALLBACK('T', "trace-funcs", &ftrace.filters, "func",
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"trace given functions only", parse_filter_func),
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OPT_CALLBACK('N', "notrace-funcs", &ftrace.notrace, "func",
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"do not trace given functions", parse_filter_func),
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OPT_CALLBACK('G', "graph-funcs", &ftrace.graph_funcs, "func",
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"Set graph filter on given functions", parse_filter_func),
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OPT_CALLBACK('g', "nograph-funcs", &ftrace.nograph_funcs, "func",
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"Set nograph filter on given functions", parse_filter_func),
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OPT_INTEGER('D', "graph-depth", &ftrace.graph_depth,
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"Max depth for function graph tracer"),
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OPT_END()
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};
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INIT_LIST_HEAD(&ftrace.filters);
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INIT_LIST_HEAD(&ftrace.notrace);
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INIT_LIST_HEAD(&ftrace.graph_funcs);
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INIT_LIST_HEAD(&ftrace.nograph_funcs);
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ret = perf_config(perf_ftrace_config, &ftrace);
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if (ret < 0)
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return -1;
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argc = parse_options(argc, argv, ftrace_options, ftrace_usage,
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PARSE_OPT_STOP_AT_NON_OPTION);
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if (!argc && target__none(&ftrace.target))
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usage_with_options(ftrace_usage, ftrace_options);
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ret = target__validate(&ftrace.target);
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if (ret) {
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char errbuf[512];
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target__strerror(&ftrace.target, ret, errbuf, 512);
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pr_err("%s\n", errbuf);
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goto out_delete_filters;
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}
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ftrace.evlist = evlist__new();
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if (ftrace.evlist == NULL) {
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ret = -ENOMEM;
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goto out_delete_filters;
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}
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ret = perf_evlist__create_maps(ftrace.evlist, &ftrace.target);
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if (ret < 0)
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goto out_delete_evlist;
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ret = __cmd_ftrace(&ftrace, argc, argv);
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out_delete_evlist:
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evlist__delete(ftrace.evlist);
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out_delete_filters:
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delete_filter_func(&ftrace.filters);
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delete_filter_func(&ftrace.notrace);
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delete_filter_func(&ftrace.graph_funcs);
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delete_filter_func(&ftrace.nograph_funcs);
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return ret;
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}
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