linux-kernel - Re: [PATCH] perf top: Use evsel's cpus to replace user_requested

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Date: Fri, 15 Dec 2023 12:59:22 -0500
From: "Liang, Kan" <kan.liang@...ux.intel.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
 Mark Rutland <mark.rutland@....com>
Cc: Ian Rogers <irogers@...gle.com>, Namhyung Kim <namhyung@...nel.org>,
 maz@...nel.org, marcan@...can.st, linux-kernel@...r.kernel.org,
 linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] perf top: Use evsel's cpus to replace user_requested_cpus



On 2023-12-15 10:36 a.m., Arnaldo Carvalho de Melo wrote:
> Kan, I also noticed that the name of the event is:
> 
> 1K cpu_atom/cycles:P/                                                   
>                                                                         
>                                               ◆
> 11K cpu_core/cycles:P/
> 
> If I try to use that on the command line:
> 
> root@...ber:~# perf top -e cpu_atom/cycles:P/
> event syntax error: 'cpu_atom/cycles:P/'
>                               \___ Bad event or PMU
> 
> Unable to find PMU or event on a PMU of 'cpu_atom'
> 
> Initial error:
> event syntax error: 'cpu_atom/cycles:P/'
>                               \___ unknown term 'cycles:P' for pmu 
> 'cpu_atom'
> 
> valid terms: 
> event,pc,edge,offcore_rsp,ldlat,inv,umask,cmask,config,config1,config2,config3,name,period,freq,branch_type,time,call-graph,stack-size,no-inherit,inherit,max-stack,nr,no-overwrite,overwrite,driver-config,percore,aux-output,aux-sample-size,metric-id,raw,legacy-cache,hardware
> Run
>  'perf list' for a list of valid events
> 
>  Usage: perf top [<options>]
> 
>     -e, --event <event>   event selector. use 'perf list' to list 
> available events
> root@...ber:~#
> 
> It should be:
> 
>   "cpu_atom/cycles/P"

The issue also impacts the perf record and report as well.

#perf record true
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.019 MB perf.data (16 samples) ]

#perf report --header-only | grep event
# event : name = cpu_atom/cycles:P/, , id = { 7360, 7361, 7362, 7363,
7364, 7365, 7366, 7367, 7368, 7369 }, type = 0 (PERF_TYPE_HARDWARE),
size = 136, config = 0xa00000000, { sample_period, sample_freq } = 3000,
sample_type = IP|TID|TIME|PERIOD|IDENTIFIER, read_format = ID|LOST,
disabled = 1, inherit = 1, freq = 1, enable_on_exec = 1, precise_ip = 3,
sample_id_all = 1
# event : name = cpu_core/cycles:P/, , id = { 7370, 7371, 7372, 7373,
7374, 7375, 7376, 7377, 7378, 7379, 7380, 7381 }, type = 0
(PERF_TYPE_HARDWARE), size = 136, config = 0x400000000, { sample_period,
sample_freq } = 3000, sample_type = IP|TID|TIME|PERIOD|IDENTIFIER,
read_format = ID|LOST, disabled = 1, inherit = 1, freq = 1,
enable_on_exec = 1, precise_ip = 3, sample_id_all = 1

I think we should move all the modifiers after the "/". The below patch
can fix it.

https://lore.kernel.org/lkml/20231215175455.1300261-1-kan.liang@linux.intel.com/

Thanks,
Kan