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Date: Wed, 24 Feb 2016 15:29:16 +0100
From: Jiri Olsa <jolsa@redhat.com>
To: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
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        "David S. Miller" <davem@davemloft.net>, He Kuang <hekuang@huawei.com>,
        =?iso-8859-1?Q?J=E9r=E9mie?= Galarneau 
	<jeremie.galarneau@efficios.com>,
        Jiri Olsa <jolsa@kernel.org>, Kirill Smelkov <kirr@nexedi.com>,
        Li Zefan <lizefan@huawei.com>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Namhyung Kim <namhyung@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>, pi3orama@163.com,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 21/48] perf record: Extract synthesize code to
 record__synthesize()
Message-ID: <20160224142916.GE27710@krava.redhat.com>
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On Mon, Feb 22, 2016 at 09:10:48AM +0000, Wang Nan wrote:

SNIP

> +		err = perf_event__synthesize_auxtrace_info(rec->itr, tool,
> +					session, process_synthesized_event);
> +		if (err)
> +			goto out;
> +	}
> +
> +	err = perf_event__synthesize_kernel_mmap(tool, process_synthesized_event,
> +						 machine);
> +	if (err < 0 && !warned_kmaps) {
> +		warned_kmaps = true;
> +		pr_err("Couldn't record kernel reference relocation symbol\n"
> +		       "Symbol resolution may be skewed if relocation was used (e.g. kexec).\n"
> +		       "Check /proc/kallsyms permission or run as root.\n");
> +	}
> +
> +	err = perf_event__synthesize_modules(tool, process_synthesized_event,
> +					     machine);
> +	if (err < 0 && !warned_modules) {
> +		warned_modules = true;

could you please add logic for warning just once
into separate patch, so this is just pure move?

also we have WARN_ONCE macro in perf

thanks,
jirka