linux-kernel - Re: [PATCH v4 3/5] perf: script: add field 'disasm' to display mnemonic instructions

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Message-ID: <e840bd05-a9e0-4463-8597-b67c7627809b@intel.com>
Date: Fri, 19 Jan 2024 20:39:36 +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>,
 Arnaldo Carvalho de Melo <acme@...nel.org>, Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v4 3/5] perf: script: add field 'disasm' to display
 mnemonic instructions

On 19/01/24 12:48, Changbin Du wrote:
> In addition to the 'insn' field, this adds a new field 'disasm' to
> display mnemonic instructions instead of the raw code.
> 
> $ sudo perf script -F +disasm
>        perf-exec 1443864 [006] 2275506.209848:          psb:  psb offs: 0                                      0 [unknown] ([unknown])
>        perf-exec 1443864 [006] 2275506.209848:          cbr:  cbr: 41 freq: 4100 MHz (114%)                    0 [unknown] ([unknown])
>               ls 1443864 [006] 2275506.209905:          1  branches:uH:      7f216b426100 _start+0x0 (/usr/lib/x86_64-linux-gnu/ld-2.31.so) insn: movq %rsp, %rdi
>               ls 1443864 [006] 2275506.209908:          1  branches:uH:      7f216b426103 _start+0x3 (/usr/lib/x86_64-linux-gnu/ld-2.31.so) insn: callq _dl_start+0x0
> 
> Signed-off-by: Changbin Du <changbin.du@...wei.com>
> ---
>  tools/perf/Documentation/perf-script.txt | 7 ++++---
>  tools/perf/builtin-script.c              | 8 +++++++-
>  2 files changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
> index ff9a52e44688..fc79167c6bf8 100644
> --- a/tools/perf/Documentation/perf-script.txt
> +++ b/tools/perf/Documentation/perf-script.txt
> @@ -132,9 +132,10 @@ OPTIONS
>          Comma separated list of fields to print. Options are:
>          comm, tid, pid, time, cpu, event, trace, ip, sym, dso, dsoff, addr, symoff,
>          srcline, period, iregs, uregs, brstack, brstacksym, flags, bpf-output,
> -        brstackinsn, brstackinsnlen, brstackoff, callindent, insn, insnlen, synth,
> -        phys_addr, metric, misc, srccode, ipc, data_page_size, code_page_size, ins_lat,
> -        machine_pid, vcpu, cgroup, retire_lat.
> +        brstackinsn, brstackinsnlen, brstackoff, callindent, insn, disasm,
> +        insnlen, synth, phys_addr, metric, misc, srccode, ipc, data_page_size,
> +        code_page_size, ins_lat, machine_pid, vcpu, cgroup, retire_lat.
> +

Further down, there are explanations for insn and insnlen.  disasm
could be added there.

>          Field list can be prepended with the type, trace, sw or hw,
>          to indicate to which event type the field list applies.
>          e.g., -F sw:comm,tid,time,ip,sym  and -F trace:time,cpu,trace
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 4817a37f16e2..12d886694f6c 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -135,6 +135,7 @@ enum perf_output_field {
>  	PERF_OUTPUT_CGROUP          = 1ULL << 39,
>  	PERF_OUTPUT_RETIRE_LAT      = 1ULL << 40,
>  	PERF_OUTPUT_DSOFF           = 1ULL << 41,
> +	PERF_OUTPUT_DISASM          = 1ULL << 42,
>  };
>  
>  struct perf_script {
> @@ -190,6 +191,7 @@ struct output_option {
>  	{.str = "bpf-output",   .field = PERF_OUTPUT_BPF_OUTPUT},
>  	{.str = "callindent", .field = PERF_OUTPUT_CALLINDENT},
>  	{.str = "insn", .field = PERF_OUTPUT_INSN},
> +	{.str = "disasm", .field = PERF_OUTPUT_DISASM},
>  	{.str = "insnlen", .field = PERF_OUTPUT_INSNLEN},
>  	{.str = "brstackinsn", .field = PERF_OUTPUT_BRSTACKINSN},
>  	{.str = "brstackoff", .field = PERF_OUTPUT_BRSTACKOFF},
> @@ -1515,6 +1517,10 @@ static int perf_sample__fprintf_insn(struct perf_sample *sample,
>  		printed += fprintf(fp, " insn: ");
>  		printed += sample__fprintf_insn_raw(sample, fp);
>  	}
> +	if (PRINT_FIELD(DISASM) && sample->insn_len) {
> +		printed += fprintf(fp, " insn: ");
> +		printed += sample__fprintf_insn(sample, thread, machine, fp);
> +	}
>  	if (PRINT_FIELD(BRSTACKINSN) || PRINT_FIELD(BRSTACKINSNLEN))
>  		printed += perf_sample__fprintf_brstackinsn(sample, thread, attr, machine, fp);
>  
> @@ -3900,7 +3906,7 @@ int cmd_script(int argc, const char **argv)
>  		     "Fields: comm,tid,pid,time,cpu,event,trace,ip,sym,dso,dsoff,"
>  		     "addr,symoff,srcline,period,iregs,uregs,brstack,"
>  		     "brstacksym,flags,data_src,weight,bpf-output,brstackinsn,"
> -		     "brstackinsnlen,brstackoff,callindent,insn,insnlen,synth,"
> +		     "brstackinsnlen,brstackoff,callindent,insn,disasm,insnlen,synth,"
>  		     "phys_addr,metric,misc,srccode,ipc,tod,data_page_size,"
>  		     "code_page_size,ins_lat,machine_pid,vcpu,cgroup,retire_lat",
>  		     parse_output_fields),