linux-kernel - Re: [PATCHv2 2/8] perf probe: Improve detection of file/function name in the probe pattern

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Message-ID: <20150312202414.GD3550@kernel.org>
Date:	Thu, 12 Mar 2015 17:24:14 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	mpe@...erman.id.au, ananth@...ibm.com
Subject: Re: [PATCHv2 2/8] perf probe: Improve detection of file/function
 name in the probe pattern

Em Mon, Dec 15, 2014 at 08:20:32PM +0530, Naveen N. Rao escreveu:
> Currently, perf probe considers patterns including a '.' to be a file.
> However, this causes problems on powerpc ABIv1 where all functions have
> a leading '.':
> 
>   $ perf probe -F | grep schedule_timeout_interruptible
>   .schedule_timeout_interruptible
>   $ perf probe .schedule_timeout_interruptible
>   Semantic error :File always requires line number or lazy pattern.
>     Error: Command Parse Error.
> 
> Fix this by checking the probe pattern in more detail.

Masami, can I have your Acked-by or Reviewed-by?


- Arnaldo
 
> Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
> ---
>  tools/perf/util/probe-event.c | 23 ++++++++++++++++++++---
>  1 file changed, 20 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index 28eb141..9943ff3 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -999,6 +999,24 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
>  		arg = tmp;
>  	}
>  
> +	/*
> +	 * Check arg is function or file name and copy it.
> +	 *
> +	 * We consider arg to be a file spec if and only if it satisfies
> +	 * all of the below criteria::
> +	 * - it does not include any of "+@%",
> +	 * - it includes one of ":;", and
> +	 * - it has a period '.' in the name.
> +	 *
> +	 * Otherwise, we consider arg to be a function specification.
> +	 */
> +	c = 0;
> +	if (!strpbrk(arg, "+@%") && (ptr = strpbrk(arg, ";:")) != NULL) {
> +		/* This is a file spec if it includes a '.' before ; or : */
> +		if (memchr(arg, '.', ptr-arg))
> +			c = 1;
> +	}
> +
>  	ptr = strpbrk(arg, ";:+@%");
>  	if (ptr) {
>  		nc = *ptr;
> @@ -1009,10 +1027,9 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
>  	if (tmp == NULL)
>  		return -ENOMEM;
>  
> -	/* Check arg is function or file and copy it */
> -	if (strchr(tmp, '.'))	/* File */
> +	if (c == 1)
>  		pp->file = tmp;
> -	else			/* Function */
> +	else
>  		pp->function = tmp;
>  
>  	/* Parse other options */
> -- 
> 2.1.3
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