linux-kernel - Re: [PATCH 1/5] perf test: Fix 2 bugs in 'perf test BPF'

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Date:	Tue, 17 Nov 2015 09:56:44 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	masami.hiramatsu.pt@...achi.com, ast@...nel.org,
	lizefan@...wei.com, pi3orama@....com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] perf test: Fix 2 bugs in 'perf test BPF'

Em Tue, Nov 17, 2015 at 08:32:46AM +0000, Wang Nan escreveu:
> Two bugs in 'perf test BPF' are found when testing BPF prologue without
> vmlinux:
> 
>  # mv /lib/modules/4.3.0-rc4+/build/vmlinux{,.bak}
>  # ./perf test BPF
>  37: Test BPF filter                                          :Failed to find the path for kernel: No such file or directory
>  Ok
> 
> Test BPF should fail in this case.
> 
> This patch fixes two bugs in 'perf test BPF'. After this patch:
> 
>  # ./perf test BPF
>  37: Test BPF filter                                          :Failed to find the path for kernel: No such file or directory
>   FAILED!
>  # mv /lib/modules/4.3.0-rc4+/build/vmlinux{.bak,}
>  # ./perf test BPF
>  37: Test BPF filter                                          : Ok

Applied, it is a clear improvement, but:

[root@zoo ~]# perf test
 1: vmlinux symtab matches kallsyms                          : Skip
 2: detect openat syscall event                              : Ok
<SNIP>
 5: parse events tests                                       : Ok
 6: Validate PERF_RECORD_* events & perf_sample fields       : FAILED!
 7: Test perf pmu format parsing                             : Ok
<SNIP>
37: Test BPF filter                                          :Failed to find the path for kernel: Invalid ELF file
 FAILED!
38: x86 rdpmc test                                           : Ok
39: Test converting perf time to TSC                         : FAILED!
40: Test dwarf unwind                                        : Ok
41: Test x86 instruction decoder - new instructions          : Ok
42: Test intel cqm nmi context read                          : Skip
[root@zoo ~]# 

------------------------

It is now the only test to emit some message in non-verbose mode that is not
"Ok", "FAILED!" or "Skip" :-)

- Arnaldo
 
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
>  tools/perf/tests/bpf.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/tests/bpf.c b/tools/perf/tests/bpf.c
> index c7131fa..dca3998 100644
> --- a/tools/perf/tests/bpf.c
> +++ b/tools/perf/tests/bpf.c
> @@ -102,8 +102,7 @@ static int do_test(struct bpf_object *obj, int (*func)(void),
>  	err = parse_events_load_bpf_obj(&parse_evlist, &parse_evlist.list, obj);
>  	if (err || list_empty(&parse_evlist.list)) {
>  		pr_debug("Failed to add events selected by BPF\n");
> -		if (!err)
> -			return TEST_FAIL;
> +		return TEST_FAIL;
>  	}
>  
>  	snprintf(pid, sizeof(pid), "%d", getpid());
> @@ -157,8 +156,10 @@ static int do_test(struct bpf_object *obj, int (*func)(void),
>  		}
>  	}
>  
> -	if (count != expect)
> +	if (count != expect) {
>  		pr_debug("BPF filter result incorrect\n");
> +		goto out_delete_evlist;
> +	}
>  
>  	ret = TEST_OK;
>  
> -- 
> 1.8.3.4
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