From e7c634fcc6ff921d725ba988cdb198ca8b59a39f Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Fri, 14 Dec 2018 10:12:09 -0300 Subject: [PATCH] perf trace: Allow configuring if zeroed syscall args should be printed MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The default so far, since we show argument names followed by its values, was to make the output more compact by suppressing most zeroed args. Make this configurable so that users can choose what best suit their needs. Cc: Adrian Hunter Cc: Jiri Olsa Cc: Luis Cláudio Gonçalves Cc: Namhyung Kim Cc: Wang Nan Link: https://lkml.kernel.org/n/tip-q0gxws02ygodh94o0hzim5xd@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Documentation/perf-config.txt | 2 ++ tools/perf/builtin-trace.c | 6 +++++- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt index 423cb41f6e3f..b55bd16c77fe 100644 --- a/tools/perf/Documentation/perf-config.txt +++ b/tools/perf/Documentation/perf-config.txt @@ -528,6 +528,8 @@ trace.*:: The initial use case is to add augmented_raw_syscalls.o to activate the 'perf trace' logic that looks for syscall pointer contents after the normal tracepoint payload. + trace.show_zeros:: + Do not suppress syscall arguments that are equal to zero. SEE ALSO -------- diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index d754a74aef46..4d97bdac205c 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -127,6 +127,7 @@ struct trace { bool show_tool_stats; bool trace_syscalls; bool kernel_syscallchains; + bool show_zeros; bool force; bool vfs_getname; int trace_pgfaults; @@ -1598,6 +1599,7 @@ static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size, * strarray for it. */ if (val == 0 && + !trace->show_zeros && !(sc->arg_fmt && (sc->arg_fmt[arg.idx].show_zero || sc->arg_fmt[arg.idx].scnprintf == SCA_STRARRAY || @@ -3526,14 +3528,16 @@ static void trace__set_bpf_map_syscalls(struct trace *trace) static int trace__config(const char *var, const char *value, void *arg) { + struct trace *trace = arg; int err = 0; if (!strcmp(var, "trace.add_events")) { - struct trace *trace = arg; struct option o = OPT_CALLBACK('e', "event", &trace->evlist, "event", "event selector. use 'perf list' to list available events", parse_events_option); err = parse_events_option(&o, value, 0); + } else if (!strcmp(var, "trace.show_zeros")) { + trace->show_zeros = perf_config_bool(var, value); } return err;