linux-kernel - Re: [PATCH] perf tools: Synthesize anon MMAP records on the heap

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Message-ID: <20140113165441.GB25953@redhat.com>
Date:	Mon, 13 Jan 2014 11:54:41 -0500
From:	Don Zickus <dzickus@...hat.com>
To:	Gaurav Jain <gjain@...com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arun Sharma <asharma@...com>
Subject: Re: [PATCH] perf tools: Synthesize anon MMAP records on the heap

On Sat, Jan 11, 2014 at 08:32:14PM -0800, Gaurav Jain wrote:
> Anon records usually do not have the 'execname' entry. However if they are on
> the heap, the execname shows up as '[heap]'. The fix considers any executable
> entries in the map that do not have a name or are on the heap as anon records
> and sets the name to '//anon'.
> 
> This fixes JIT profiling for records on the heap.

I guess I don't understand the need for this fix.  It seems breaking out
//anon vs. [heap] would be useful.  Your patch is saying otherwise.  Can
give a description of the problem you are trying to solve?

Also style issue below..

> 
> Signed-off-by: Gaurav Jain <gjain@...com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Don Zickus <dzickus@...hat.com>
> Cc: Arun Sharma <asharma@...com>
> ---
>  tools/perf/util/event.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
> index bb788c1..ae9c55b 100644
> --- a/tools/perf/util/event.c
> +++ b/tools/perf/util/event.c
> @@ -224,10 +224,9 @@ static int perf_event__synthesize_mmap_events(struct perf_tool *tool,
>  				continue;
>  
>  			event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
> -		}
> -
> -		if (!strcmp(execname, ""))
> +		} if (!strcmp(execname, "") || !strcmp(execname, "[heap]")) {

The '} if' part should seperate the 'if' on to its own line (unless you
meant an 'else' in there).

Cheers,
Don
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