linux-kernel - Re: [PATCH v4 4/5] perf: script: add raw|disasm arguments to --insn-trace option

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Date: Fri, 19 Jan 2024 20:39:50 +0200
From: Adrian Hunter <adrian.hunter@...el.com>
To: Changbin Du <changbin.du@...wei.com>
Cc: Mark Rutland <mark.rutland@....com>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
 Ian Rogers <irogers@...gle.com>, linux-kernel@...r.kernel.org,
 linux-perf-users@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
 Thomas Richter <tmricht@...ux.ibm.com>, changbin.du@...il.com,
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
 Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: [PATCH v4 4/5] perf: script: add raw|disasm arguments to
 --insn-trace option

On 19/01/24 12:48, Changbin Du wrote:
> Now '--insn-trace' accept a argument to specify the output format:
>   - raw: display raw instructions.
>   - disasm: display mnemonic instructions (if capstone is installed).
> 
> $ sudo perf script --insn-trace=raw
>               ls 1443864 [006] 2275506.209908875:      7f216b426100 _start+0x0 (/usr/lib/x86_64-linux-gnu/ld-2.31.so) insn: 48 89 e7
>               ls 1443864 [006] 2275506.209908875:      7f216b426103 _start+0x3 (/usr/lib/x86_64-linux-gnu/ld-2.31.so) insn: e8 e8 0c 00 00
>               ls 1443864 [006] 2275506.209908875:      7f216b426df0 _dl_start+0x0 (/usr/lib/x86_64-linux-gnu/ld-2.31.so) insn: f3 0f 1e fa
> 
> $ sudo perf script --insn-trace=disasm
>               ls 1443864 [006] 2275506.209908875:      7f216b426100 _start+0x0 (/usr/lib/x86_64-linux-gnu/ld-2.31.so) insn: movq %rsp, %rdi
>               ls 1443864 [006] 2275506.209908875:      7f216b426103 _start+0x3 (/usr/lib/x86_64-linux-gnu/ld-2.31.so) insn: callq _dl_start+0x0
>               ls 1443864 [006] 2275506.209908875:      7f216b426df0 _dl_start+0x0 (/usr/lib/x86_64-linux-gnu/ld-2.31.so) insn: illegal instruction
>               ls 1443864 [006] 2275506.209908875:      7f216b426df4 _dl_start+0x4 (/usr/lib/x86_64-linux-gnu/ld-2.31.so) insn: pushq %rbp
>               ls 1443864 [006] 2275506.209908875:      7f216b426df5 _dl_start+0x5 (/usr/lib/x86_64-linux-gnu/ld-2.31.so) insn: movq %rsp, %rbp
>               ls 1443864 [006] 2275506.209908875:      7f216b426df8 _dl_start+0x8 (/usr/lib/x86_64-linux-gnu/ld-2.31.so) insn: pushq %r15
> 
> Signed-off-by: Changbin Du <changbin.du@...wei.com>
> ---
>  tools/perf/Documentation/perf-script.txt |  6 +++---
>  tools/perf/builtin-script.c              | 17 +++++++++++++----
>  2 files changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
> index fc79167c6bf8..9ae54f5bcb4d 100644
> --- a/tools/perf/Documentation/perf-script.txt
> +++ b/tools/perf/Documentation/perf-script.txt
> @@ -442,9 +442,9 @@ include::itrace.txt[]
>  	will be printed. Each entry has function name and file/line. Enabled by
>  	default, disable with --no-inline.
>  
> ---insn-trace::
> -	Show instruction stream for intel_pt traces. Combine with --xed to
> -	show disassembly.
> +--insn-trace[=<raw|disasm>]::
> +	Show raw or mnemonic instruction stream for intel_pt traces. You can
> +	also combine raw instructions with --xed to show disassembly.

Perhaps this is a bit clearer:

Show instruction stream in bytes (raw) or disassembled (disasm)
for intel_pt traces. The default is 'raw'. To use xed, combine
'raw' with --xed to show disassembly done by xed.

>  
>  --xed::
>  	Run xed disassembler on output. Requires installing the xed disassembler.
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 12d886694f6c..2e3752b3b65a 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -3769,10 +3769,19 @@ static int perf_script__process_auxtrace_info(struct perf_session *session,
>  #endif
>  
>  static int parse_insn_trace(const struct option *opt __maybe_unused,
> -			    const char *str __maybe_unused,
> -			    int unset __maybe_unused)
> +			    const char *str, int unset __maybe_unused)
>  {
> -	parse_output_fields(NULL, "+insn,-event,-period", 0);
> +	const char *fields = "+insn,-event,-period";
> +
> +	if (str) {
> +		if (strcmp(str, "disasm") == 0)
> +			fields = "+disasm,-event,-period";
> +		else if (strlen(str) != 0 && strcmp(str, "raw") != 0) {
> +			fprintf(stderr, "Only accept raw|disasm\n");
> +			return -EINVAL;
> +		}
> +	}
> +	parse_output_fields(NULL, fields, 0);
>  	itrace_parse_synth_opts(opt, "i0ns", 0);
>  	symbol_conf.nanosecs = true;
>  	return 0;
> @@ -3918,7 +3927,7 @@ int cmd_script(int argc, const char **argv)
>  		   "only consider these symbols"),
>  	OPT_INTEGER(0, "addr-range", &symbol_conf.addr_range,
>  		    "Use with -S to list traced records within address range"),
> -	OPT_CALLBACK_OPTARG(0, "insn-trace", &itrace_synth_opts, NULL, NULL,
> +	OPT_CALLBACK_OPTARG(0, "insn-trace", &itrace_synth_opts, NULL, "raw|disasm",
>  			"Decode instructions from itrace", parse_insn_trace),
>  	OPT_CALLBACK_OPTARG(0, "xed", NULL, NULL, NULL,
>  			"Run xed disassembler on output", parse_xed),