From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752732AbbKZCVs (ORCPT ); Wed, 25 Nov 2015 21:21:48 -0500 Received: from mail.kernel.org ([198.145.29.136]:57690 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751935AbbKZCUv (ORCPT ); Wed, 25 Nov 2015 21:20:51 -0500 Message-Id: <20151126022047.970712854@goodmis.org> User-Agent: quilt/0.61-1 Date: Wed, 25 Nov 2015 21:19:04 -0500 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Ingo Molnar , Andrew Morton Subject: [for-next][PATCH 1/5] ring-buffer: Process commits whenever moving to a new page. References: <20151126021903.416197072@goodmis.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Disposition: inline; filename=0001-ring-buffer-Process-commits-whenever-moving-to-a-new.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Steven Rostedt (Red Hat)" When crossing over to a new page, commit the current work. This will allow readers to get data with less latency, and also simplifies the work to get timestamps working for interrupted events. Signed-off-by: Steven Rostedt --- kernel/trace/ring_buffer.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 631541a53baf..95181e36891a 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -2129,6 +2129,8 @@ rb_reset_tail(struct ring_buffer_per_cpu *cpu_buffer, local_sub(length, &tail_page->write); } +static inline void rb_end_commit(struct ring_buffer_per_cpu *cpu_buffer); + /* * This is the slow path, force gcc not to inline it. */ @@ -2220,6 +2222,11 @@ rb_move_tail(struct ring_buffer_per_cpu *cpu_buffer, rb_reset_tail(cpu_buffer, tail, info); + /* Commit what we have for now. */ + rb_end_commit(cpu_buffer); + /* rb_end_commit() decs committing */ + local_inc(&cpu_buffer->committing); + /* fail and let the caller try again */ return ERR_PTR(-EAGAIN); -- 2.6.1