diff options
Diffstat (limited to 'tools/perf/builtin-ftrace.c')
| -rw-r--r-- | tools/perf/builtin-ftrace.c | 158 |
1 files changed, 92 insertions, 66 deletions
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c index 8fd3c9c44c69..2b54e2ddc80a 100644 --- a/tools/perf/builtin-ftrace.c +++ b/tools/perf/builtin-ftrace.c @@ -30,36 +30,12 @@ #include "strfilter.h" #include "util/cap.h" #include "util/config.h" +#include "util/ftrace.h" #include "util/units.h" #include "util/parse-sublevel-options.h" #define DEFAULT_TRACER "function_graph" -struct perf_ftrace { - struct 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; - unsigned long percpu_buffer_size; - bool inherit; - int func_stack_trace; - int func_irq_info; - int graph_nosleep_time; - int graph_noirqs; - int graph_verbose; - int graph_thresh; - unsigned int initial_delay; -}; - -struct filter_entry { - struct list_head list; - char name[]; -}; - static volatile int workload_exec_errno; static bool done; @@ -704,8 +680,6 @@ out: return (done && !workload_exec_errno) ? 0 : -1; } -#define NUM_BUCKET 22 /* 20 + 2 (for outliers in both direction) */ - static void make_histogram(int buckets[], char *buf, size_t len, char *linebuf) { char *p, *q; @@ -816,69 +790,116 @@ static void display_histogram(int buckets[]) } -static int __cmd_latency(struct perf_ftrace *ftrace) +static int prepare_func_latency(struct perf_ftrace *ftrace) { char *trace_file; - int trace_fd; - char buf[4096]; - char line[256]; - struct pollfd pollfd = { - .events = POLLIN, - }; - int buckets[NUM_BUCKET] = { }; + int fd; - if (!(perf_cap__capable(CAP_PERFMON) || - perf_cap__capable(CAP_SYS_ADMIN))) { - pr_err("ftrace only works for %s!\n", -#ifdef HAVE_LIBCAP_SUPPORT - "users with the CAP_PERFMON or CAP_SYS_ADMIN capability" -#else - "root" -#endif - ); - return -1; - } + if (ftrace->target.use_bpf) + return perf_ftrace__latency_prepare_bpf(ftrace); if (reset_tracing_files(ftrace) < 0) { pr_err("failed to reset ftrace\n"); - goto out; + return -1; } /* reset ftrace buffer */ if (write_tracing_file("trace", "0") < 0) - goto out; + return -1; if (set_tracing_options(ftrace) < 0) - goto out_reset; + return -1; /* force to use the function_graph tracer to track duration */ if (write_tracing_file("current_tracer", "function_graph") < 0) { pr_err("failed to set current_tracer to function_graph\n"); - goto out_reset; + return -1; } trace_file = get_tracing_file("trace_pipe"); if (!trace_file) { pr_err("failed to open trace_pipe\n"); - goto out_reset; + return -1; } - trace_fd = open(trace_file, O_RDONLY); + fd = open(trace_file, O_RDONLY); + if (fd < 0) + pr_err("failed to open trace_pipe\n"); put_tracing_file(trace_file); + return fd; +} - if (trace_fd < 0) { - pr_err("failed to open trace_pipe\n"); - goto out_reset; +static int start_func_latency(struct perf_ftrace *ftrace) +{ + if (ftrace->target.use_bpf) + return perf_ftrace__latency_start_bpf(ftrace); + + if (write_tracing_file("tracing_on", "1") < 0) { + pr_err("can't enable tracing\n"); + return -1; } + return 0; +} + +static int stop_func_latency(struct perf_ftrace *ftrace) +{ + if (ftrace->target.use_bpf) + return perf_ftrace__latency_stop_bpf(ftrace); + + write_tracing_file("tracing_on", "0"); + return 0; +} + +static int read_func_latency(struct perf_ftrace *ftrace, int buckets[]) +{ + if (ftrace->target.use_bpf) + return perf_ftrace__latency_read_bpf(ftrace, buckets); + + return 0; +} + +static int cleanup_func_latency(struct perf_ftrace *ftrace) +{ + if (ftrace->target.use_bpf) + return perf_ftrace__latency_cleanup_bpf(ftrace); + + reset_tracing_files(ftrace); + return 0; +} + +static int __cmd_latency(struct perf_ftrace *ftrace) +{ + int trace_fd; + char buf[4096]; + char line[256]; + struct pollfd pollfd = { + .events = POLLIN, + }; + int buckets[NUM_BUCKET] = { }; + + if (!(perf_cap__capable(CAP_PERFMON) || + perf_cap__capable(CAP_SYS_ADMIN))) { + pr_err("ftrace only works for %s!\n", +#ifdef HAVE_LIBCAP_SUPPORT + "users with the CAP_PERFMON or CAP_SYS_ADMIN capability" +#else + "root" +#endif + ); + return -1; + } + + trace_fd = prepare_func_latency(ftrace); + if (trace_fd < 0) + goto out; + fcntl(trace_fd, F_SETFL, O_NONBLOCK); pollfd.fd = trace_fd; - if (write_tracing_file("tracing_on", "1") < 0) { - pr_err("can't enable tracing\n"); - goto out_close_fd; - } + if (start_func_latency(ftrace) < 0) + goto out; evlist__start_workload(ftrace->evlist); @@ -896,29 +917,30 @@ static int __cmd_latency(struct perf_ftrace *ftrace) } } - write_tracing_file("tracing_on", "0"); + stop_func_latency(ftrace); if (workload_exec_errno) { const char *emsg = str_error_r(workload_exec_errno, buf, sizeof(buf)); pr_err("workload failed: %s\n", emsg); - goto out_close_fd; + goto out; } /* read remaining buffer contents */ - while (true) { + while (!ftrace->target.use_bpf) { int n = read(trace_fd, buf, sizeof(buf) - 1); if (n <= 0) break; make_histogram(buckets, buf, n, line); } + read_func_latency(ftrace, buckets); + display_histogram(buckets); -out_close_fd: - close(trace_fd); -out_reset: - reset_tracing_files(ftrace); out: + close(trace_fd); + cleanup_func_latency(ftrace); + return (done && !workload_exec_errno) ? 0 : -1; } @@ -1144,6 +1166,10 @@ int cmd_ftrace(int argc, const char **argv) const struct option latency_options[] = { OPT_CALLBACK('T', "trace-funcs", &ftrace.filters, "func", "Show latency of given function", parse_filter_func), +#ifdef HAVE_BPF_SKEL + OPT_BOOLEAN('b', "use-bpf", &ftrace.target.use_bpf, + "Use BPF to measure function latency"), +#endif OPT_PARENT(common_options), }; const struct option *options = ftrace_options; |