diff options
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/Documentation/perf-trace.txt | 3 | ||||
| -rw-r--r-- | tools/perf/builtin-trace.c | 13 |
2 files changed, 16 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-trace.txt b/tools/perf/Documentation/perf-trace.txt index ed485df16409..1bbcf305d233 100644 --- a/tools/perf/Documentation/perf-trace.txt +++ b/tools/perf/Documentation/perf-trace.txt @@ -123,6 +123,9 @@ the thread executes on the designated CPUs. Default is to monitor all CPUs. man pages for details. The ones that are most useful in 'perf trace' are 'dwarf' and 'lbr', where available, try: 'perf trace --call-graph dwarf'. +--kernel-syscall-graph:: + Show the kernel callchains on the syscall exit path. + --event:: Trace other events, see 'perf list' for a complete list. diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 63a3cc9b717c..cfa5ce8fdb7b 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -159,6 +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; @@ -2661,6 +2662,15 @@ 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; @@ -3221,6 +3231,7 @@ 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; @@ -3269,6 +3280,8 @@ int cmd_trace(int argc, const char **argv, const char *prefix __maybe_unused) 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() |