diff options
Diffstat (limited to 'tools/perf/builtin-trace.c')
| -rw-r--r-- | tools/perf/builtin-trace.c | 65 |
1 files changed, 64 insertions, 1 deletions
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 11290b57ce04..2ec53edcf649 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -34,6 +34,7 @@ #include "trace-event.h" #include "util/parse-events.h" #include "util/bpf-loader.h" +#include "callchain.h" #include "syscalltbl.h" #include <libaudit.h> /* FIXME: Still needed for audit_errno_to_name */ @@ -158,6 +159,7 @@ struct trace { bool show_comm; bool show_tool_stats; bool trace_syscalls; + bool kernel_syscallchains; bool force; bool vfs_getname; int trace_pgfaults; @@ -2190,6 +2192,22 @@ signed_print: goto signed_print; fputc('\n', trace->output); + + if (sample->callchain) { + struct addr_location al; + /* TODO: user-configurable print_opts */ + const unsigned int print_opts = PRINT_IP_OPT_SYM | + PRINT_IP_OPT_DSO | + PRINT_IP_OPT_UNKNOWN_AS_ADDR; + + if (machine__resolve(trace->host, &al, sample) < 0) { + pr_err("problem processing %d event, skipping it.\n", + event->header.type); + goto out_put; + } + perf_evsel__fprintf_callchain(evsel, sample, &al, 38, print_opts, + scripting_max_stack, trace->output); + } out: ttrace->entry_pending = false; err = 0; @@ -2645,6 +2663,15 @@ static int trace__add_syscall_newtp(struct trace *trace) perf_evlist__add(evlist, sys_enter); perf_evlist__add(evlist, sys_exit); + if (trace->opts.callgraph_set && !trace->kernel_syscallchains) { + /* + * We're interested only in the user space callchain + * leading to the syscall, allow overriding that for + * debugging reasons using --kernel_syscall_callchains + */ + sys_exit->attr.exclude_callchain_kernel = 1; + } + trace->syscalls.events.sys_enter = sys_enter; trace->syscalls.events.sys_exit = sys_exit; @@ -2723,7 +2750,27 @@ static int trace__run(struct trace *trace, int argc, const char **argv) goto out_delete_evlist; } - perf_evlist__config(evlist, &trace->opts); + perf_evlist__config(evlist, &trace->opts, NULL); + + if (trace->opts.callgraph_set && trace->syscalls.events.sys_exit) { + perf_evsel__config_callchain(trace->syscalls.events.sys_exit, + &trace->opts, &callchain_param); + /* + * Now we have evsels with different sample_ids, use + * PERF_SAMPLE_IDENTIFIER to map from sample to evsel + * from a fixed position in each ring buffer record. + * + * As of this the changeset introducing this comment, this + * isn't strictly needed, as the fields that can come before + * PERF_SAMPLE_ID are all used, but we'll probably disable + * some of those for things like copying the payload of + * pointer syscall arguments, and for vfs_getname we don't + * need PERF_SAMPLE_ADDR and PERF_SAMPLE_IP, so do this + * here as a warning we need to use PERF_SAMPLE_IDENTIFIER. + */ + perf_evlist__set_sample_bit(evlist, IDENTIFIER); + perf_evlist__reset_sample_bit(evlist, ID); + } signal(SIGCHLD, sig_handler); signal(SIGINT, sig_handler); @@ -3205,6 +3252,7 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused) .output = stderr, .show_comm = true, .trace_syscalls = true, + .kernel_syscallchains = false, }; const char *output_name = NULL; const char *ev_qualifier_str = NULL; @@ -3250,6 +3298,11 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused) "Trace pagefaults", parse_pagefaults, "maj"), OPT_BOOLEAN(0, "syscalls", &trace.trace_syscalls, "Trace syscalls"), OPT_BOOLEAN('f', "force", &trace.force, "don't complain, do it"), + OPT_CALLBACK(0, "call-graph", &trace.opts, + "record_mode[,record_size]", record_callchain_help, + &record_parse_callchain_opt), + OPT_BOOLEAN(0, "kernel-syscall-graph", &trace.kernel_syscallchains, + "Show the kernel callchains on the syscall exit path"), OPT_UINTEGER(0, "proc-map-timeout", &trace.opts.proc_map_timeout, "per thread proc mmap processing timeout in ms"), OPT_END() @@ -3273,11 +3326,21 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused) argc = parse_options_subcommand(argc, argv, trace_options, trace_subcommands, trace_usage, PARSE_OPT_STOP_AT_NON_OPTION); + err = bpf__setup_stdout(trace.evlist); + if (err) { + bpf__strerror_setup_stdout(trace.evlist, err, bf, sizeof(bf)); + pr_err("ERROR: Setup BPF stdout failed: %s\n", bf); + goto out; + } + if (trace.trace_pgfaults) { trace.opts.sample_address = true; trace.opts.sample_time = true; } + if (trace.opts.callgraph_set) + symbol_conf.use_callchain = true; + if (trace.evlist->nr_entries > 0) evlist__set_evsel_handler(trace.evlist, trace__event_handler); |