From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757172AbZC3RNn (ORCPT ); Mon, 30 Mar 2009 13:13:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753061AbZC3RL2 (ORCPT ); Mon, 30 Mar 2009 13:11:28 -0400 Received: from casper.infradead.org ([85.118.1.10]:49746 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753407AbZC3RLY (ORCPT ); Mon, 30 Mar 2009 13:11:24 -0400 Message-Id: <20090330171023.327144324@chello.nl> References: <20090330170701.856843742@chello.nl> User-Agent: quilt/0.46-1 Date: Mon, 30 Mar 2009 19:07:04 +0200 From: Peter Zijlstra To: Ingo Molnar , linux-kernel@vger.kernel.org Cc: Paul Mackerras , Peter Zijlstra Subject: [PATCH 03/15] perf_counter: kerneltop: simplify data_head read Content-Disposition: inline; filename=kerneltop-new-mmap.patch X-Bad-Reply: References but no 'Re:' in Subject. Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Now that the kernel side changed, match up again. Signed-off-by: Peter Zijlstra --- Documentation/perf_counter/kerneltop.c | 14 +------------- 1 file changed, 1 insertion(+), 13 deletions(-) Index: linux-2.6/Documentation/perf_counter/kerneltop.c =================================================================== --- linux-2.6.orig/Documentation/perf_counter/kerneltop.c +++ linux-2.6/Documentation/perf_counter/kerneltop.c @@ -1125,22 +1125,10 @@ struct mmap_data { static unsigned int mmap_read_head(struct mmap_data *md) { struct perf_counter_mmap_page *pc = md->base; - unsigned int seq, head; - -repeat: - rmb(); - seq = pc->lock; - - if (unlikely(seq & 1)) { - cpu_relax(); - goto repeat; - } + int head; head = pc->data_head; - rmb(); - if (pc->lock != seq) - goto repeat; return head; } --