From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757882Ab3J2OIp (ORCPT ); Tue, 29 Oct 2013 10:08:45 -0400 Received: from terminus.zytor.com ([198.137.202.10]:45911 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757779Ab3J2OIl (ORCPT ); Tue, 29 Oct 2013 10:08:41 -0400 Date: Tue, 29 Oct 2013 07:08:07 -0700 From: tip-bot for Oleg Nesterov Message-ID: Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org, peterz@infradead.org, oleg@redhat.com, tglx@linutronix.de Reply-To: mingo@kernel.org, hpa@zytor.com, linux-kernel@vger.kernel.org, peterz@infradead.org, tglx@linutronix.de, oleg@redhat.com In-Reply-To: <20131016200945.GB23214@redhat.com> References: <20131016200945.GB23214@redhat.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/core] perf: Kill the dead !vma-> vm_mm code in perf_event_mmap_event() Git-Commit-ID: 32c5fb7e7d18b4fd37c5e29dea731151e9d66866 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.1 (terminus.zytor.com [127.0.0.1]); Tue, 29 Oct 2013 07:08:12 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 32c5fb7e7d18b4fd37c5e29dea731151e9d66866 Gitweb: http://git.kernel.org/tip/32c5fb7e7d18b4fd37c5e29dea731151e9d66866 Author: Oleg Nesterov AuthorDate: Wed, 16 Oct 2013 22:09:45 +0200 Committer: Ingo Molnar CommitDate: Tue, 29 Oct 2013 12:02:51 +0100 perf: Kill the dead !vma->vm_mm code in perf_event_mmap_event() 1. perf_event_mmap(vma) is never called with a gate_vma-like arg, remove the "if (!vma->vm_mm)" code. 2. arch_vma_name() can use the chached value of mmap_event->vma. 3. Change the code to not call arch_vma_name() twice. 4. Purely cosmetic, but since we use "goto got_name" all the time remove "else" from "[stack]" branch just for symmetry. Signed-off-by: Oleg Nesterov Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/r/20131016200945.GB23214@redhat.com Signed-off-by: Ingo Molnar --- kernel/events/core.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index 028dad9..3ea5605 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -5136,21 +5136,19 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event) min = MINOR(dev); } else { - if (arch_vma_name(mmap_event->vma)) { - name = strncpy(tmp, arch_vma_name(mmap_event->vma), - sizeof(tmp) - 1); + name = arch_vma_name(vma); + if (name) { + name = strncpy(tmp, name, sizeof(tmp) - 1); tmp[sizeof(tmp) - 1] = '\0'; goto got_name; } - if (!vma->vm_mm) { - name = strncpy(tmp, "[vdso]", sizeof(tmp)); - goto got_name; - } else if (vma->vm_start <= vma->vm_mm->start_brk && + 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 && + } + 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;