linux-kernel - Re: [PATCH 31/32] perf, tools: Default to cpu// for events v3

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Date:	Wed, 28 Nov 2012 16:53:13 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com,
	peterz@...radead.org, eranian@...gle.com, mingo@...nel.org,
	namhyung@...nel.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 31/32] perf, tools: Default to cpu// for events v3

On Fri, Nov 09, 2012 at 05:27:47PM -0800, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> When an event fails to parse and it's not in a new style format,
> try to parse it again as a cpu event.
> 
> This allows to use sysfs exported events directly without //, so I can use
> 
> perf record -e tx-aborts ...
> 
> instead of
> 
> perf record -e cpu/tx-aborts/
> 
> v2: Handle multiple events
> v3: Move to separate function
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  tools/perf/util/parse-events.c |   45 +++++++++++++++++++++++++++++++++++++++-
>  1 files changed, 44 insertions(+), 1 deletions(-)
> 
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index 5b97a2b..70cbd1c 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -768,6 +768,47 @@ int parse_events_name(struct list_head *list, char *name)
>  	return 0;
>  }
>  
> +static void str_append(char **s, int *len, const char *a)
> +{
> +	int olen = *s ? strlen(*s) : 0;
> +	int nlen = olen + strlen(a) + 1;
> +	if (*len < nlen) {
> +		*len = *len * 2;
> +		if (*len < nlen)
> +			*len = nlen;
> +		*s = realloc(*s, *len);
> +		if (!*s)
> +			exit(ENOMEM);

Rather use BUG_ON or event better return -ENOMEM.

> +		if (olen == 0)
> +			**s = 0;
> +	}
> +	strcat(*s, a);
> +}

Could this one be moved to util/string.c in some generic form?

thanks,
jirka
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