Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754510AbcCWKCf (ORCPT ); Wed, 23 Mar 2016 06:02:35 -0400 Received: from bombadil.infradead.org ([198.137.202.9]:55962 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751816AbcCWKC1 (ORCPT ); Wed, 23 Mar 2016 06:02:27 -0400 Date: Wed, 23 Mar 2016 11:02:20 +0100 From: Peter Zijlstra To: Wang Nan Cc: mingo@redhat.com, linux-kernel@vger.kernel.org, He Kuang , Alexei Starovoitov , Arnaldo Carvalho de Melo , Brendan Gregg , Jiri Olsa , Masami Hiramatsu , Namhyung Kim , Zefan Li , pi3orama@163.com Subject: Re: [PATCH 5/5] perf core: Reduce perf event output overhead by new overflow handler Message-ID: <20160323100220.GX6344@twins.programming.kicks-ass.net> References: <1457949585-191064-1-git-send-email-wangnan0@huawei.com> <1457949585-191064-6-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1457949585-191064-6-git-send-email-wangnan0@huawei.com> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 466 Lines: 10 On Mon, Mar 14, 2016 at 09:59:45AM +0000, Wang Nan wrote: > By creating onward and backward specific overflow handlers and setting > them according to event's backward setting, normal sampling events > don't need checking backward setting of an event any more. The normal antonym of backward is forward. Onward does not indicate a direction per se, its more a continuance or progression of a previously set goal. Also, just squash these last two patches together.