linux-kernel - Re: [PATCH 3/3] perf scripts python: arm-cs-trace-disasm.py: do not ignore disam first sample

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Date: Mon, 18 Dec 2023 17:28:26 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ruidong Tian <tianruidong@...ux.alibaba.com>,
	Leo Yan <leo.yan@...aro.org>, Al Grant <al.grant@....com>,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	Tor Jeremiassen <tor@...com>
Cc: linux-kernel@...r.kernel.org, james.clark@....com,
	coresight@...ts.linaro.org, suzuki.poulose@....com,
	mike.leach@...aro.org, alexander.shishkin@...ux.intel.com,
	linux-arm-kernel@...ts.infradead.org, adrian.hunter@...el.com,
	linux-perf-users@...r.kernel.org, leo.yan@...aro.org
Subject: Re: [PATCH 3/3] perf scripts python: arm-cs-trace-disasm.py: do not
 ignore disam first sample

Em Thu, Dec 14, 2023 at 08:33:04PM +0800, Ruidong Tian escreveu:
> arm-cs-trace-disasm ignore disam the first branch sample, For example as
> follow, the instructions beteween 0x0000ffffae878750 and
> 0x0000ffffae878754 is lose:

Leo, Mathieu, Tor, Al, can you guys take a look and provide an Acked or
Reviewed-by tag?

Thanks,

- Arnaldo
 
>   ARM CoreSight Trace Data Assembler Dump
>   Event type: branches:uH
>   Sample = { cpu: 0000 addr: 0x0000ffffae878750 phys_addr: 0x0000000000000000 ip: 0x0000000000000000 pid: 4003489 tid: 4003489 period: 1 time: 26765151766034 }
>   Event type: branches:uH
>   Sample = { cpu: 0000 addr: 0x0000000000000000 phys_addr: 0x0000000000000000 ip: 0x0000ffffae878754 pid: 4003489 tid: 4003489 period: 1 time: 26765151766034 }
> 
> Initialize cpu_data earlier to fix it:
> 
>   ARM CoreSight Trace Data Assembler Dump
>   Event type: branches:uH
>   Sample = { cpu: 0000 addr: 0x0000000000000000 phys_addr: 0x0000000000000000 ip: 0x0000ffffae878754 pid: 4003489 tid: 4003489 period: 1 time: 26765151766034 }
>         0000000000028740 <ioctl>: (base address is 0x0000ffffae850000)
>            28750: b13ffc1f      cmn     x0, #4095
>            28754: 54000042      b.hs    0x2875c <ioctl+0x1c>
>             test 4003489/4003489 [0000]     26765.151766034  __GI___ioctl+0x14                        /usr/lib64/libc-2.32.so
>   Event type: branches:uH
>   Sample = { cpu: 0000 addr: 0x0000ffffa67535ac phys_addr: 0x0000000000000000 ip: 0x0000000000000000 pid: 4003489 tid: 4003489 period: 1 time: 26765151766034 }
> 
> Signed-off-by: Ruidong Tian <tianruidong@...ux.alibaba.com>
> ---
>  .../scripts/python/arm-cs-trace-disasm.py     | 21 ++++++++++---------
>  1 file changed, 11 insertions(+), 10 deletions(-)
> 
> diff --git a/tools/perf/scripts/python/arm-cs-trace-disasm.py b/tools/perf/scripts/python/arm-cs-trace-disasm.py
> index c9e14af5b58c..b1eb4293cbef 100755
> --- a/tools/perf/scripts/python/arm-cs-trace-disasm.py
> +++ b/tools/perf/scripts/python/arm-cs-trace-disasm.py
> @@ -190,6 +190,17 @@ def process_event(param_dict):
>  	dso_end = get_optional(param_dict, "dso_map_end")
>  	symbol = get_optional(param_dict, "symbol")
>  
> +	cpu = sample["cpu"]
> +	ip = sample["ip"]
> +	addr = sample["addr"]
> +
> +	# Initialize CPU data if it's empty, and directly return back
> +	# if this is the first tracing event for this CPU.
> +	if (cpu_data.get(str(cpu) + 'addr') == None):
> +		cpu_data[str(cpu) + 'addr'] = addr
> +		return
> +
> +
>  	if (options.verbose == True):
>  		print("Event type: %s" % name)
>  		print_sample(sample)
> @@ -211,16 +222,6 @@ def process_event(param_dict):
>  	if (name[0:8] != "branches"):
>  		return
>  
> -	cpu = sample["cpu"]
> -	ip = sample["ip"]
> -	addr = sample["addr"]
> -
> -	# Initialize CPU data if it's empty, and directly return back
> -	# if this is the first tracing event for this CPU.
> -	if (cpu_data.get(str(cpu) + 'addr') == None):
> -		cpu_data[str(cpu) + 'addr'] = addr
> -		return
> -
>  	# The format for packet is:
>  	#
>  	#		  +------------+------------+------------+
> -- 
> 2.33.1
> 
> 

-- 

- Arnaldo