Re: [PATCH 07/12] perf script: Pad dso name for --call-trace
From: Song Liu
Date: Mon May 06 2019 - 17:40:16 EST
> On May 3, 2019, at 1:18 AM, Jiri Olsa <jolsa@xxxxxxxxxx> wrote:
>
> Padding dso name for --call-trace so we don't have the
> indent screwed by different dso name lengths, as now
> for kernel there's also bpf code displayed.
>
> # perf-with-kcore record pt -e intel_pt//ku -- sleep 1
> # perf-core/perf-with-kcore script pt --call-trace
>
> Before:
> sleep 36660 [016] 1057036.806464404: ([kernel.kallsyms]) kretprobe_perf_func
> sleep 36660 [016] 1057036.806464404: ([kernel.kallsyms]) trace_call_bpf
> sleep 36660 [016] 1057036.806464404: ([kernel.kallsyms]) __x86_indirect_thunk_rax
> sleep 36660 [016] 1057036.806464404: ([kernel.kallsyms]) __x86_indirect_thunk_rax
> sleep 36660 [016] 1057036.806464725: (bpf_prog_da4fe6b3d2c29b25_trace_return) bpf_get_current_pid_tgid
> sleep 36660 [016] 1057036.806464725: (bpf_prog_da4fe6b3d2c29b25_trace_return) bpf_ktime_get_ns
> sleep 36660 [016] 1057036.806464725: ([kernel.kallsyms]) __x86_indirect_thunk_rax
> sleep 36660 [016] 1057036.806464725: ([kernel.kallsyms]) __x86_indirect_thunk_rax
> sleep 36660 [016] 1057036.806465045: (bpf_prog_da4fe6b3d2c29b25_trace_return) __htab_map_lookup_elem
> sleep 36660 [016] 1057036.806465366: ([kernel.kallsyms]) memcmp
> sleep 36660 [016] 1057036.806465687: (bpf_prog_da4fe6b3d2c29b25_trace_return) bpf_probe_read
> sleep 36660 [016] 1057036.806465687: ([kernel.kallsyms]) probe_kernel_read
> sleep 36660 [016] 1057036.806465687: ([kernel.kallsyms]) __check_object_size
> sleep 36660 [016] 1057036.806465687: ([kernel.kallsyms]) check_stack_object
> sleep 36660 [016] 1057036.806465687: ([kernel.kallsyms]) copy_user_enhanced_fast_string
> sleep 36660 [016] 1057036.806465687: (bpf_prog_da4fe6b3d2c29b25_trace_return) bpf_probe_read
> sleep 36660 [016] 1057036.806465687: ([kernel.kallsyms]) probe_kernel_read
> sleep 36660 [016] 1057036.806465687: ([kernel.kallsyms]) __check_object_size
> sleep 36660 [016] 1057036.806465687: ([kernel.kallsyms]) check_stack_object
> sleep 36660 [016] 1057036.806465687: ([kernel.kallsyms]) copy_user_enhanced_fast_string
> sleep 36660 [016] 1057036.806466008: (bpf_prog_da4fe6b3d2c29b25_trace_return) bpf_get_current_uid_gid
> sleep 36660 [016] 1057036.806466008: ([kernel.kallsyms]) from_kgid
> sleep 36660 [016] 1057036.806466008: ([kernel.kallsyms]) from_kuid
> sleep 36660 [016] 1057036.806466008: (bpf_prog_da4fe6b3d2c29b25_trace_return) bpf_perf_event_output
> sleep 36660 [016] 1057036.806466328: ([kernel.kallsyms]) perf_event_output
> sleep 36660 [016] 1057036.806466328: ([kernel.kallsyms]) perf_prepare_sample
> sleep 36660 [016] 1057036.806466328: ([kernel.kallsyms]) perf_misc_flags
> sleep 36660 [016] 1057036.806466328: ([kernel.kallsyms]) __x86_indirect_thunk_rax
> sleep 36660 [016] 1057036.806466328: ([kernel.kallsyms]) __x86_indirect_thunk_rax
> sleep 36660 [016] 1057036.806466328: ([kvm]) kvm_is_in_guest
> sleep 36660 [016] 1057036.806466649: ([kernel.kallsyms]) __perf_event_header__init_id.isra.0
> sleep 36660 [016] 1057036.806466649: ([kernel.kallsyms]) perf_output_begin
>
> After:
> sleep 36660 [016] 1057036.806464404: ([kernel.kallsyms] ) kretprobe_perf_func
> sleep 36660 [016] 1057036.806464404: ([kernel.kallsyms] ) trace_call_bpf
> sleep 36660 [016] 1057036.806464404: ([kernel.kallsyms] ) __x86_indirect_thunk_rax
> sleep 36660 [016] 1057036.806464404: ([kernel.kallsyms] ) __x86_indirect_thunk_rax
> sleep 36660 [016] 1057036.806464725: (bpf_prog_da4fe6b3d2c29b25_trace_return ) bpf_get_current_pid_tgid
> sleep 36660 [016] 1057036.806464725: (bpf_prog_da4fe6b3d2c29b25_trace_return ) bpf_ktime_get_ns
> sleep 36660 [016] 1057036.806464725: ([kernel.kallsyms] ) __x86_indirect_thunk_rax
> sleep 36660 [016] 1057036.806464725: ([kernel.kallsyms] ) __x86_indirect_thunk_rax
> sleep 36660 [016] 1057036.806465045: (bpf_prog_da4fe6b3d2c29b25_trace_return ) __htab_map_lookup_elem
> sleep 36660 [016] 1057036.806465366: ([kernel.kallsyms] ) memcmp
> sleep 36660 [016] 1057036.806465687: (bpf_prog_da4fe6b3d2c29b25_trace_return ) bpf_probe_read
> sleep 36660 [016] 1057036.806465687: ([kernel.kallsyms] ) probe_kernel_read
> sleep 36660 [016] 1057036.806465687: ([kernel.kallsyms] ) __check_object_size
> sleep 36660 [016] 1057036.806465687: ([kernel.kallsyms] ) check_stack_object
> sleep 36660 [016] 1057036.806465687: ([kernel.kallsyms] ) copy_user_enhanced_fast_string
> sleep 36660 [016] 1057036.806465687: (bpf_prog_da4fe6b3d2c29b25_trace_return ) bpf_probe_read
> sleep 36660 [016] 1057036.806465687: ([kernel.kallsyms] ) probe_kernel_read
> sleep 36660 [016] 1057036.806465687: ([kernel.kallsyms] ) __check_object_size
> sleep 36660 [016] 1057036.806465687: ([kernel.kallsyms] ) check_stack_object
> sleep 36660 [016] 1057036.806465687: ([kernel.kallsyms] ) copy_user_enhanced_fast_string
> sleep 36660 [016] 1057036.806466008: (bpf_prog_da4fe6b3d2c29b25_trace_return ) bpf_get_current_uid_gid
> sleep 36660 [016] 1057036.806466008: ([kernel.kallsyms] ) from_kgid
> sleep 36660 [016] 1057036.806466008: ([kernel.kallsyms] ) from_kuid
> sleep 36660 [016] 1057036.806466008: (bpf_prog_da4fe6b3d2c29b25_trace_return ) bpf_perf_event_output
> sleep 36660 [016] 1057036.806466328: ([kernel.kallsyms] ) perf_event_output
> sleep 36660 [016] 1057036.806466328: ([kernel.kallsyms] ) perf_prepare_sample
> sleep 36660 [016] 1057036.806466328: ([kernel.kallsyms] ) perf_misc_flags
> sleep 36660 [016] 1057036.806466328: ([kernel.kallsyms] ) __x86_indirect_thunk_rax
> sleep 36660 [016] 1057036.806466328: ([kernel.kallsyms] ) __x86_indirect_thunk_rax
>
> Link: http://lkml.kernel.org/n/tip-99g9rg4p20a1o99vr0nkjhq8@xxxxxxxxxxxxxx
> Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
> ---
> tools/include/linux/kernel.h | 1 +
> tools/lib/vsprintf.c | 19 +++++++++++++++++++
> tools/perf/builtin-script.c | 1 +
> tools/perf/util/map.c | 6 ++++++
> tools/perf/util/symbol_conf.h | 1 +
> 5 files changed, 28 insertions(+)
>
> diff --git a/tools/include/linux/kernel.h b/tools/include/linux/kernel.h
> index 857d9e22826e..cba226948a0c 100644
> --- a/tools/include/linux/kernel.h
> +++ b/tools/include/linux/kernel.h
> @@ -102,6 +102,7 @@
>
> int vscnprintf(char *buf, size_t size, const char *fmt, va_list args);
> int scnprintf(char * buf, size_t size, const char * fmt, ...);
> +int scnprintf_pad(char * buf, size_t size, const char * fmt, ...);
>
> #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
>
> diff --git a/tools/lib/vsprintf.c b/tools/lib/vsprintf.c
> index e08ee147eab4..149a15013b23 100644
> --- a/tools/lib/vsprintf.c
> +++ b/tools/lib/vsprintf.c
> @@ -23,3 +23,22 @@ int scnprintf(char * buf, size_t size, const char * fmt, ...)
>
> return (i >= ssize) ? (ssize - 1) : i;
> }
> +
> +int scnprintf_pad(char * buf, size_t size, const char * fmt, ...)
> +{
> + ssize_t ssize = size;
> + va_list args;
> + int i;
nit: I guess we can avoid mixing int, ssize_t and size_t here?
> +
> + va_start(args, fmt);
> + i = vsnprintf(buf, size, fmt, args);
> + va_end(args);
> +
> + if (i < (int) size) {
> + for (; i < (int) size; i++)
> + buf[i] = ' ';
> + buf[i] = 0x0;
> + }
> +
> + return (i >= ssize) ? (ssize - 1) : i;
> +}
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 61cfd8f70989..7adaa6c63a0b 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -3297,6 +3297,7 @@ static int parse_call_trace(const struct option *opt __maybe_unused,
> parse_output_fields(NULL, "-ip,-addr,-event,-period,+callindent", 0);
> itrace_parse_synth_opts(opt, "cewp", 0);
> symbol_conf.nanosecs = true;
> + symbol_conf.pad_output_len_dso = 50;
> return 0;
> }
>
> diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
> index ee71efb9db62..c3fbd6e556b0 100644
> --- a/tools/perf/util/map.c
> +++ b/tools/perf/util/map.c
> @@ -405,6 +405,7 @@ size_t map__fprintf(struct map *map, FILE *fp)
>
> size_t map__fprintf_dsoname(struct map *map, FILE *fp)
> {
> + char buf[PATH_MAX];
nit: PATH_MAX vs. 50 is a little weird.
> const char *dsoname = "[unknown]";
>
> if (map && map->dso) {
> @@ -414,6 +415,11 @@ size_t map__fprintf_dsoname(struct map *map, FILE *fp)
> dsoname = map->dso->name;
> }
>
> + if (symbol_conf.pad_output_len_dso) {
> + scnprintf_pad(buf, symbol_conf.pad_output_len_dso, "%s", dsoname);
> + dsoname = buf;
> + }
> +
> return fprintf(fp, "%s", dsoname);
> }
>
> diff --git a/tools/perf/util/symbol_conf.h b/tools/perf/util/symbol_conf.h
> index 6c55fa6fccec..382ba63fc554 100644
> --- a/tools/perf/util/symbol_conf.h
> +++ b/tools/perf/util/symbol_conf.h
> @@ -69,6 +69,7 @@ struct symbol_conf {
> *tid_list;
> const char *symfs;
> int res_sample;
> + int pad_output_len_dso;
> };
>
> extern struct symbol_conf symbol_conf;
> --
> 2.20.1
>