linux-kernel - Re: [PATCH 11/11] perf kvm top: limit guest kernel info message to once

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Date:	Mon, 23 Jul 2012 20:17:08 +0200
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	David Ahern <dsahern@...il.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 11/11] perf kvm top: limit guest kernel info message to
 once

Em Fri, Jul 20, 2012 at 05:25:56PM -0600, David Ahern escreveu:
> 'perf kvm top' shows a continual flurry of:
>     Can't find guest [5201]'s kernel information
> 
> if it can't find the guest info and with a lot of VMs running a user
> has no chance of reading them all. Limit message to once per guest.
> 
> Signed-off-by: David Ahern <dsahern@...il.com>
> Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> ---
>  tools/perf/builtin-top.c |   14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
> index 1706dc9..6285374 100644
> --- a/tools/perf/builtin-top.c
> +++ b/tools/perf/builtin-top.c
> @@ -706,8 +706,18 @@ static void perf_event__process_sample(struct perf_tool *tool,
>  	int err;
>  
>  	if (!machine && perf_guest) {
> -		pr_err("Can't find guest [%d]'s kernel information\n",
> -			event->ip.pid);
> +		static struct strlist *seen;
> +		char pidstr[8];
> +
> +		if (!seen)
> +			seen = strlist__new(true, NULL);
> +
> +		scnprintf(pidstr, sizeof(pidstr), "%d", event->ip.pid);
> +		if (!strlist__has_entry(seen, pidstr)) {
> +			pr_err("Can't find guest [%d]'s kernel information\n",
> +				event->ip.pid);
> +			strlist__add(seen, pidstr);
> +		}

Abuse of strlist? Can't we have an intlist?

- Arnaldo
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