From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754683AbaEHKrR (ORCPT ); Thu, 8 May 2014 06:47:17 -0400 Received: from terminus.zytor.com ([198.137.202.10]:33418 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753494AbaEHKrK (ORCPT ); Thu, 8 May 2014 06:47:10 -0400 Date: Thu, 8 May 2014 03:46:38 -0700 From: tip-bot for Peter Zijlstra Message-ID: Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org, torvalds@linux-foundation.org, peterz@infradead.org, tony.luck@intel.com, luto@amacapital.net, fenghua.yu@intel.com, tglx@linutronix.de Reply-To: mingo@kernel.org, hpa@zytor.com, linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, peterz@infradead.org, tony.luck@intel.com, luto@amacapital.net, fenghua.yu@intel.com, tglx@linutronix.de To: linux-tip-commits@vger.kernel.org Subject: [tip:sched/core] sched/idle, ia64: Switch from TS_POLLING to TIF_POLLING_NRFLAG Git-Commit-ID: 04075425331f91f7176a34232c21b63af0eafc53 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 04075425331f91f7176a34232c21b63af0eafc53 Gitweb: http://git.kernel.org/tip/04075425331f91f7176a34232c21b63af0eafc53 Author: Peter Zijlstra AuthorDate: Fri, 11 Apr 2014 09:59:08 +0200 Committer: Ingo Molnar CommitDate: Thu, 8 May 2014 09:16:55 +0200 sched/idle, ia64: Switch from TS_POLLING to TIF_POLLING_NRFLAG Standardize the idle polling indicator to TIF_POLLING_NRFLAG such that both TIF_NEED_RESCHED and TIF_POLLING_NRFLAG are in the same word. This will allow us, using fetch_or(), to both set NEED_RESCHED and check for POLLING_NRFLAG in a single operation and avoid pointless wakeups. Changing from the non-atomic thread_info::status flags to the atomic thread_info::flags shouldn't be a big issue since most polling state changes were followed/preceded by a full memory barrier anyway. Signed-off-by: Peter Zijlstra Cc: Fenghua Yu Cc: Linus Torvalds Cc: Tony Luck Cc: Andy Lutomirski Cc: linux-ia64@vger.kernel.org Link: http://lkml.kernel.org/n/tip-6633akuird5hi3si4gbegkm8@git.kernel.org Signed-off-by: Ingo Molnar --- arch/ia64/include/asm/thread_info.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/ia64/include/asm/thread_info.h b/arch/ia64/include/asm/thread_info.h index 5957cf6..5b17418 100644 --- a/arch/ia64/include/asm/thread_info.h +++ b/arch/ia64/include/asm/thread_info.h @@ -107,6 +107,7 @@ struct thread_info { #define TIF_MCA_INIT 18 /* this task is processing MCA or INIT */ #define TIF_DB_DISABLED 19 /* debug trap disabled for fsyscall */ #define TIF_RESTORE_RSE 21 /* user RBS is newer than kernel RBS */ +#define TIF_POLLING_NRFLAG 22 /* idle is polling for TIF_NEED_RESCHED */ #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) @@ -118,6 +119,7 @@ struct thread_info { #define _TIF_MCA_INIT (1 << TIF_MCA_INIT) #define _TIF_DB_DISABLED (1 << TIF_DB_DISABLED) #define _TIF_RESTORE_RSE (1 << TIF_RESTORE_RSE) +#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) /* "work to do on user-return" bits */ #define TIF_ALLWORK_MASK (_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\ @@ -125,7 +127,6 @@ struct thread_info { /* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */ #define TIF_WORK_MASK (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)) -#define TS_POLLING 1 /* true if in idle loop and not sleeping */ #define TS_RESTORE_SIGMASK 2 /* restore signal mask in do_signal() */ #ifndef __ASSEMBLY__