linux-kernel - Re: [PATCH v1 2/2] perf-stat: enable counting events for BPF programs

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Date:   Fri, 4 Dec 2020 00:31:41 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Song Liu <songliubraving@...com>
Cc:     linux-kernel@...r.kernel.org, kernel-team@...com,
        peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        namhyung@...nel.org
Subject: Re: [PATCH v1 2/2] perf-stat: enable counting events for BPF programs

On Wed, Dec 02, 2020 at 01:37:09AM -0800, Song Liu wrote:
> Introduce perf-stat -b option, which counts events for BPF programs, like:
> 
> [root@...alhost ~]# ~/perf stat -e ref-cycles,cycles -b 254 -I 1000
>      1.487903822            115,200      ref-cycles
>      1.487903822             86,012      cycles
>      2.489147029             80,560      ref-cycles
>      2.489147029             73,784      cycles
>      3.490341825             60,720      ref-cycles
>      3.490341825             37,797      cycles
>      4.491540887             37,120      ref-cycles
>      4.491540887             31,963      cycles

hi,
I'm getting compile fail with gcc 10:

	builtin-stat.c: In function ‘cmd_stat’:
	builtin-stat.c:2429:7: error: declaration of ‘err’ shadows a previous local [-Werror=shadow]
	 2429 |   int err = perf_event__synthesize_kernel_mmap((void *)&perf_stat,
	      |       ^~~
	builtin-stat.c:2104:33: note: shadowed declaration is here
	 2104 |  int status = -EINVAL, run_idx, err;
	      |                                 ^~~

jirka