From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753901AbZEZCFn (ORCPT ); Mon, 25 May 2009 22:05:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753177AbZEZCE5 (ORCPT ); Mon, 25 May 2009 22:04:57 -0400 Received: from ey-out-2122.google.com ([74.125.78.26]:27600 "EHLO ey-out-2122.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752863AbZEZCE4 (ORCPT ); Mon, 25 May 2009 22:04:56 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=YhJRQR5Sq5F/CgjXgNv2vkVTaUWOB1YOTWSqW8CLvApBipMtFJmKYuhcJg1X5cmsrZ 1uawW0Y4AepPg+oIIfepM5Bhj+A/Cm+3D67SMowjxdDE2u4t9kZrQncTuHO7mI0d7ost VZI3qoT480j28t7ihaFXG60h7XSJ42oVDHaLA= From: Frederic Weisbecker To: Ingo Molnar Cc: LKML , Li Zefan , Lai Jiangshan , Steven Rostedt , Pekka Enberg , Zhaolei , Tom Zanussi , Frederic Weisbecker Subject: [PATCH 2/5] tracing/events: change the type of __str_loc_item to unsigned short Date: Tue, 26 May 2009 04:04:47 +0200 Message-Id: <1243303490-8019-3-git-send-email-fweisbec@gmail.com> X-Mailer: git-send-email 1.6.2.3 In-Reply-To: <1243303490-8019-1-git-send-email-fweisbec@gmail.com> References: <1243303490-8019-1-git-send-email-fweisbec@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Li Zefan When defining a dynamic size string, we add __str_loc_##item to the trace entry, and it stores the location of the actual string in entry->_str_data[] 'unsigned short' should be sufficient to store this information, thus we save 2 bytes per dyn-size string in the ring buffer. [ Impact: reduce memory occupied by dyn-size strings in ring buffer ] Signed-off-by: Li Zefan Cc: Steven Rostedt LKML-Reference: <4A14EDB6.2050507@cn.fujitsu.com> Signed-off-by: Frederic Weisbecker --- include/trace/ftrace.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h index edb02bc..b5ff2e8 100644 --- a/include/trace/ftrace.h +++ b/include/trace/ftrace.h @@ -25,7 +25,7 @@ #define __field(type, item) type item; #undef __string -#define __string(item, src) int __str_loc_##item; +#define __string(item, src) unsigned short __str_loc_##item; #undef TP_STRUCT__entry #define TP_STRUCT__entry(args...) args -- 1.6.2.3