linux-kernel - Re: [tip:perf/core] perf: Add non-exec mmap() tracking

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Date:	Wed, 9 Jun 2010 13:44:19 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	mingo@...hat.com, hpa@...or.com, anton@...ba.org, acme@...hat.com,
	paulus@...ba.org, linux-kernel@...r.kernel.org,
	a.p.zijlstra@...llo.nl, efault@....de, fweisbec@...il.com,
	ebmunson@...ibm.com, rostedt@...dmis.org, tglx@...utronix.de,
	mingo@...e.hu
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/core] perf: Add non-exec mmap() tracking

H Eric,

On Wed, Jun 9, 2010 at 1:15 PM, tip-bot for Eric B Munson
<ebmunson@...ibm.com> wrote:
> Commit-ID:  3af9e859281bda7eb7c20b51879cf43aa788ac2e
> Gitweb:     http://git.kernel.org/tip/3af9e859281bda7eb7c20b51879cf43aa788ac2e
> Author:     Eric B Munson <ebmunson@...ibm.com>
> AuthorDate: Tue, 18 May 2010 15:30:49 +0100
> Committer:  Ingo Molnar <mingo@...e.hu>
> CommitDate: Wed, 9 Jun 2010 11:12:34 +0200
>
> perf: Add non-exec mmap() tracking
>
> Add the capacility to track data mmap()s. This can be used together
> with PERF_SAMPLE_ADDR for data profiling.
>
> Signed-off-by: Anton Blanchard <anton@...ba.org>
> [Updated code for stable perf ABI]
> Signed-off-by: Eric B Munson <ebmunson@...ibm.com>
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Mike Galbraith <efault@....de>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> LKML-Reference: <1274193049-25997-1-git-send-email-ebmunson@...ibm.com>
> Signed-off-by: Ingo Molnar <mingo@...e.hu>

> @@ -3830,6 +3834,14 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
>                if (!vma->vm_mm) {
>                        name = strncpy(tmp, "[vdso]", sizeof(tmp));
>                        goto got_name;
> +               } else if (vma->vm_start <= vma->vm_mm->start_brk &&
> +                               vma->vm_end >= vma->vm_mm->brk) {
> +                       name = strncpy(tmp, "[heap]", sizeof(tmp));
> +                       goto got_name;
> +               } else if (vma->vm_start <= vma->vm_mm->start_stack &&
> +                               vma->vm_end >= vma->vm_mm->start_stack) {
> +                       name = strncpy(tmp, "[stack]", sizeof(tmp));
> +                       goto got_name;
>                }
>
>                name = strncpy(tmp, "//anon", sizeof(tmp));

Doesn't this change here break the JIT generated code region detection
in map__new() of tools/perf/util/map.c? We generate a new
"/tmp/perf-<pid>.map" filename for anonymous memory regions and check
for that in dso__load() of tools/perf/util/symbol.c.

                        Pekka
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