linux-kernel - Re: [PATCH] perf: Add vm_ops->name call for mmap event name retrieval

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Date:	Mon, 14 Jul 2014 18:09:47 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jiri Olsa <jolsa@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>, luto@...capital.net,
	hpa@...ux.intel.com
Subject: Re: [PATCH] perf: Add vm_ops->name call for mmap event name retrieval

On Mon, Jul 14, 2014 at 05:57:19PM +0200, Jiri Olsa wrote:
> Following patch added another way to get mmap name:
>   78d683e mm, fs: Add vm_ops->name as an alternative to arch_vma_name

Please add to your .gitconfig:

[core]
        abbrev = 12

Also, you failed to CC the two people involved in that.

> The vdso vma mapping already switch to this and we no longer
> get vdso name via arch_vma_name function. Adding this way to
> the perf mmap event name retrieval code.
> 
> Caught this via perf test:
> 
>   $ sudo ./perf test -v 7
>    7: Validate PERF_RECORD_* events & perf_sample fields     :
>   --- start ---
> 
> SNIP
> 
>   PERF_RECORD_MMAP for [vdso] missing!
>   test child finished with 255
>   ---- end ----
>   Validate PERF_RECORD_* events & perf_sample fields: FAILED!
> 
> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  kernel/events/core.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index 67e3b9c..4799676 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -5266,6 +5266,12 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
>  
>  		goto got_name;
>  	} else {
> +		if (vma->vm_ops && vma->vm_ops->name) {
> +			name = (char *) vma->vm_ops->name(vma);
> +			if (name)
> +				goto cpy_name;
> +		}
> +
>  		name = (char *)arch_vma_name(vma);
>  		if (name)
>  			goto cpy_name;
> -- 
> 1.8.3.1
> 

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