linux-kernel - Re: [PATCH v3] perf annotate: Add itrace options support

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Date:   Tue, 15 Jun 2021 11:22:40 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Yang Jihong <yangjihong1@...wei.com>, peterz@...radead.org,
        mingo@...hat.com, acme@...nel.org, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] perf annotate: Add itrace options support

On 15/06/21 5:40 am, Yang Jihong wrote:
> The "auxtrace_info" and "auxtrace" functions are not set in "tool" member of
> "annotate". As a result, perf annotate does not support parsing itrace data.
> 
> Before:
> 
>   # perf record -e arm_spe_0/branch_filter=1/ -a sleep 1
>   [ perf record: Woken up 9 times to write data ]
>   [ perf record: Captured and wrote 20.874 MB perf.data ]
>   # perf annotate --stdio
>   Error:
>   The perf.data data has no samples!
> 
> Solution:
> 1.Add itrace options in help,
> 2.Set hook functions of "auxtrace_info" and "auxtrace" in perf_tool.
> 
> After:
> 
>   # perf record --all-user -e arm_spe_0/branch_filter=1/ ls
>   Couldn't synthesize bpf events.
>   perf.data
>   [ perf record: Woken up 1 times to write data ]
>   [ perf record: Captured and wrote 0.010 MB perf.data ]
>   # perf annotate --stdio
>    Percent |      Source code & Disassembly of libc-2.28.so for branch-miss (1 samples, percent: local period)
>   ------------------------------------------------------------------------------------------------------------
>            :
>            :
>            :
>            :           Disassembly of section .text:
>            :
>            :           0000000000066180 <__getdelim@@GLIBC_2.17>:
>       0.00 :   66180:  stp     x29, x30, [sp, #-96]!
>       0.00 :   66184:  cmp     x0, #0x0
>       0.00 :   66188:  ccmp    x1, #0x0, #0x4, ne  // ne = any
>       0.00 :   6618c:  mov     x29, sp
>       0.00 :   66190:  stp     x24, x25, [sp, #56]
> 
> Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
> ---
> 
> Changes since v2:
>  - Updating tools/perf/Documentation/perf-annotate.txt.
>  - Add test result to commit message.
> 
> Changes since v1:
>  - Adjust spaces to maintain alignment in "tool".
> 
>  tools/perf/Documentation/perf-annotate.txt |  7 +++++++
>  tools/perf/builtin-annotate.c              | 10 ++++++++++
>  2 files changed, 17 insertions(+)
> 
> diff --git a/tools/perf/Documentation/perf-annotate.txt b/tools/perf/Documentation/perf-annotate.txt
> index 80c1be5d566c..33c2521cba4a 100644
> --- a/tools/perf/Documentation/perf-annotate.txt
> +++ b/tools/perf/Documentation/perf-annotate.txt
> @@ -58,6 +58,13 @@ OPTIONS
>  --ignore-vmlinux::
>  	Ignore vmlinux files.
>  
> +--itrace::
> +	Options for decoding instruction tracing data. The options are:
> +
> +include::itrace.txt[]
> +
> +	To disable decoding entirely, use --no-itrace.
> +
>  -m::
>  --modules::
>          Load module symbols. WARNING: use only with -k and LIVE kernel.
> diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
> index 49627a7bed7c..8f87658eff31 100644
> --- a/tools/perf/builtin-annotate.c
> +++ b/tools/perf/builtin-annotate.c
> @@ -474,6 +474,8 @@ int cmd_annotate(int argc, const char **argv)
>  			.attr	= perf_event__process_attr,
>  			.build_id = perf_event__process_build_id,
>  			.tracing_data   = perf_event__process_tracing_data,
> +			.auxtrace_info	= perf_event__process_auxtrace_info,
> +			.auxtrace	= perf_event__process_auxtrace,

For sample mode, Intel PT also needs:

			.id_index	 = perf_event__process_id_index,


>  			.feature	= process_feature_event,
>  			.ordered_events = true,
>  			.ordering_requires_timestamps = true,
> @@ -483,6 +485,9 @@ int cmd_annotate(int argc, const char **argv)
>  	struct perf_data data = {
>  		.mode  = PERF_DATA_MODE_READ,
>  	};
> +	struct itrace_synth_opts itrace_synth_opts = {
> +		.set = 0,
> +	};
>  	struct option options[] = {
>  	OPT_STRING('i', "input", &input_name, "file",
>  		    "input file name"),
> @@ -547,6 +552,9 @@ int cmd_annotate(int argc, const char **argv)
>  	OPT_CALLBACK(0, "percent-type", &annotate.opts, "local-period",
>  		     "Set percent type local/global-period/hits",
>  		     annotate_parse_percent_type),
> +	OPT_CALLBACK_OPTARG(0, "itrace", &itrace_synth_opts, NULL, "opts",
> +			    "Instruction Tracing options\n" ITRACE_HELP,
> +			    itrace_parse_synth_opts),
>  
>  	OPT_END()
>  	};
> @@ -591,6 +599,8 @@ int cmd_annotate(int argc, const char **argv)
>  	if (IS_ERR(annotate.session))
>  		return PTR_ERR(annotate.session);
>  
> +	annotate.session->itrace_synth_opts = &itrace_synth_opts;
> +
>  	annotate.has_br_stack = perf_header__has_feat(&annotate.session->header,
>  						      HEADER_BRANCH_STACK);
>  
>