Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756273AbcKWHLg (ORCPT ); Wed, 23 Nov 2016 02:11:36 -0500 Received: from mail-pg0-f41.google.com ([74.125.83.41]:34248 "EHLO mail-pg0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752142AbcKWHLe (ORCPT ); Wed, 23 Nov 2016 02:11:34 -0500 From: Joel Fernandes To: linux-kernel@vger.kernel.org Cc: Joel Fernandes , Steven Rostedt , Ingo Molnar , Jonathan Corbet , linux-doc@vger.kernel.org (open list:DOCUMENTATION) Subject: [PATCH] trace: Add documentation for mono and mono_raw trace clocks Date: Tue, 22 Nov 2016 23:11:26 -0800 Message-Id: <1479885086-9679-1-git-send-email-joelaf@google.com> X-Mailer: git-send-email 2.8.0.rc3.226.g39d4020 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1284 Lines: 34 mono and mono_raw trace clocks access CLOCK_MONOTONIC and CLOCK_MONOTONIC_RAW clocks for tracing purposes. Add documentation for the same. Signed-off-by: Joel Fernandes --- Steven, I skipped adding docs for boot clock as that patch is still being discussed, but please accept documentation for the other clocks you said were missing. I will follow with the boot clock documentation at a later time. Thanks. Documentation/trace/ftrace.txt | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt index 185c39f..32cc1ee 100644 --- a/Documentation/trace/ftrace.txt +++ b/Documentation/trace/ftrace.txt @@ -362,6 +362,14 @@ of ftrace. Here is a list of some of the key files: to correlate events across hypervisor/guest if tb_offset is known. + mono: This uses the fast monotonic clock (CLOCK_MONOTONIC) + which is monotonic and is subject to NTP rate adjustments. + + mono_raw: + This is the raw monotonic clock (CLOCK_MONOTONIC_RAW) + which is montonic but is not subject to any rate adjustments + and ticks at the same rate as the hardware clocksource. + To set a clock, simply echo the clock name into this file. echo global > trace_clock -- 2.8.0.rc3.226.g39d4020