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From: Peter Zijlstra <peterz@infradead.org>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Hogan <james.hogan@imgtec.com>,
	"mingo@kernel.org" <mingo@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	"luto@amacapital.net" <luto@amacapital.net>,
	"nicolas.pitre@linaro.org" <nicolas.pitre@linaro.org>,
	"daniel.lezcano@linaro.org" <daniel.lezcano@linaro.org>,
	"umgwanakikbuti@gmail.com" <umgwanakikbuti@gmail.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Will Deacon <Will.Deacon@arm.com>,
	ARM Kernel List <linux-arm-kernel@lists.infradead.org>
Subject: Re: [RFC][PATCH 6/8] sched,idle: Avoid spurious wakeup IPIs
Date: Fri, 9 May 2014 19:06:49 +0200	[thread overview]
Message-ID: <20140509170649.GG13658@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20140509170234.GZ30445@twins.programming.kicks-ass.net>

[-- Attachment #1: Type: text/plain, Size: 1305 bytes --]

On Fri, May 09, 2014 at 07:02:34PM +0200, Peter Zijlstra wrote:
> OK, so I'll queue a patch removing TIF_POLLING_NRFLAG for arm64.


---
Subject: arm64: Remove TIF_POLLING_NRFLAG
From: Peter Zijlstra <peterz@infradead.org>
Date: Fri May  9 19:04:00 CEST 2014

The only idle method for arm64 is WFI and it therefore
unconditionally requires the reschedule interrupt when idle.

Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
---
 arch/arm64/include/asm/thread_info.h |    2 --
 1 file changed, 2 deletions(-)

--- a/arch/arm64/include/asm/thread_info.h
+++ b/arch/arm64/include/asm/thread_info.h
@@ -95,13 +95,11 @@ static inline struct thread_info *curren
  *  TIF_NEED_RESCHED	- rescheduling necessary
  *  TIF_NOTIFY_RESUME	- callback before returning to user
  *  TIF_USEDFPU		- FPU was used by this task this quantum (SMP)
- *  TIF_POLLING_NRFLAG	- true if poll_idle() is polling TIF_NEED_RESCHED
  */
 #define TIF_SIGPENDING		0
 #define TIF_NEED_RESCHED	1
 #define TIF_NOTIFY_RESUME	2	/* callback before returning to user */
 #define TIF_SYSCALL_TRACE	8
-#define TIF_POLLING_NRFLAG	16
 #define TIF_MEMDIE		18	/* is terminating due to OOM killer */
 #define TIF_FREEZE		19
 #define TIF_RESTORE_SIGMASK	20

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WARNING: multiple messages have this Message-ID (diff)
From: peterz@infradead.org (Peter Zijlstra)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC][PATCH 6/8] sched,idle: Avoid spurious wakeup IPIs
Date: Fri, 9 May 2014 19:06:49 +0200	[thread overview]
Message-ID: <20140509170649.GG13658@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20140509170234.GZ30445@twins.programming.kicks-ass.net>

On Fri, May 09, 2014 at 07:02:34PM +0200, Peter Zijlstra wrote:
> OK, so I'll queue a patch removing TIF_POLLING_NRFLAG for arm64.


---
Subject: arm64: Remove TIF_POLLING_NRFLAG
From: Peter Zijlstra <peterz@infradead.org>
Date: Fri May  9 19:04:00 CEST 2014

The only idle method for arm64 is WFI and it therefore
unconditionally requires the reschedule interrupt when idle.

Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
---
 arch/arm64/include/asm/thread_info.h |    2 --
 1 file changed, 2 deletions(-)

--- a/arch/arm64/include/asm/thread_info.h
+++ b/arch/arm64/include/asm/thread_info.h
@@ -95,13 +95,11 @@ static inline struct thread_info *curren
  *  TIF_NEED_RESCHED	- rescheduling necessary
  *  TIF_NOTIFY_RESUME	- callback before returning to user
  *  TIF_USEDFPU		- FPU was used by this task this quantum (SMP)
- *  TIF_POLLING_NRFLAG	- true if poll_idle() is polling TIF_NEED_RESCHED
  */
 #define TIF_SIGPENDING		0
 #define TIF_NEED_RESCHED	1
 #define TIF_NOTIFY_RESUME	2	/* callback before returning to user */
 #define TIF_SYSCALL_TRACE	8
-#define TIF_POLLING_NRFLAG	16
 #define TIF_MEMDIE		18	/* is terminating due to OOM killer */
 #define TIF_FREEZE		19
 #define TIF_RESTORE_SIGMASK	20
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  reply	other threads:[~2014-05-09 17:06 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-04-11 13:42 [RFC][PATCH 0/8] sched,idle: need resched polling rework Peter Zijlstra
2014-04-11 13:42 ` [RFC][PATCH 1/8] sched,idle,alpha: Switch from TS_POLLING to TIF_POLLING_NRFLAG Peter Zijlstra
2014-04-11 14:38   ` Richard Henderson
2014-04-11 13:42 ` [RFC][PATCH 2/8] sched,idle,tile: " Peter Zijlstra
2014-04-11 15:15   ` Chris Metcalf
2014-04-11 15:30     ` Peter Zijlstra
2014-04-11 13:42 ` [RFC][PATCH 3/8] sched,idle,ia64: " Peter Zijlstra
2014-04-11 13:42 ` [RFC][PATCH 4/8] sched,idle,x86: " Peter Zijlstra
2014-04-11 13:42 ` [RFC][PATCH 5/8] sched,idle: Remove TS_POLLING support Peter Zijlstra
2014-04-11 13:42 ` [RFC][PATCH 6/8] sched,idle: Avoid spurious wakeup IPIs Peter Zijlstra
2014-04-13 21:41   ` Nicolas Pitre
2014-05-09 13:37   ` James Hogan
2014-05-09 13:37     ` James Hogan
2014-05-09 14:15     ` Peter Zijlstra
2014-05-09 14:15       ` Peter Zijlstra
2014-05-09 14:40       ` Catalin Marinas
2014-05-09 14:40         ` Catalin Marinas
2014-05-09 14:50         ` Peter Zijlstra
2014-05-09 14:50           ` Peter Zijlstra
2014-05-09 14:57           ` Catalin Marinas
2014-05-09 14:57             ` Catalin Marinas
2014-05-09 17:02             ` Peter Zijlstra
2014-05-09 17:02               ` Peter Zijlstra
2014-05-09 17:06               ` Peter Zijlstra [this message]
2014-05-09 17:06                 ` Peter Zijlstra
2014-05-09 17:09                 ` Catalin Marinas
2014-05-09 17:09                   ` Catalin Marinas
2014-05-09 17:20                   ` Peter Zijlstra
2014-05-09 17:20                     ` Peter Zijlstra
2014-05-19 12:54                 ` [tip:sched/arch] arm64: Remove TIF_POLLING_NRFLAG tip-bot for Peter Zijlstra
2014-05-22 12:26                 ` [tip:sched/core] " tip-bot for Peter Zijlstra
2014-05-09 14:51       ` [RFC][PATCH 6/8] sched,idle: Avoid spurious wakeup IPIs James Hogan
2014-05-09 14:51         ` James Hogan
2014-05-09 14:51         ` James Hogan
2014-05-15  9:17         ` James Hogan
2014-05-15  9:17           ` James Hogan
2014-05-15  9:17           ` James Hogan
2014-05-19 12:54         ` [tip:sched/arch] metag: Remove TIF_POLLING_NRFLAG tip-bot for James Hogan
2014-05-22 12:26         ` [tip:sched/core] " tip-bot for James Hogan
2014-04-11 13:42 ` [RFC][PATCH 7/8] sched,idle: Delay clearing the polling bit Peter Zijlstra
2014-04-13 21:51   ` Nicolas Pitre
2014-04-11 13:42 ` [RFC][PATCH 8/8] sched,idle: Reflow cpuidle_idle_call() Peter Zijlstra
2014-04-13 21:36   ` Nicolas Pitre
2014-04-14  8:59     ` Peter Zijlstra
2014-04-14  9:25       ` Peter Zijlstra
2014-04-14 13:55         ` Nicolas Pitre
2014-04-11 15:00 ` [RFC][PATCH 0/8] sched,idle: need resched polling rework Andy Lutomirski
2014-04-11 15:14   ` Peter Zijlstra
2014-05-22 12:58   ` Peter Zijlstra
2014-05-22 13:09     ` Peter Zijlstra
2014-05-29  0:01       ` Andy Lutomirski
2014-05-29  6:48         ` Peter Zijlstra
2014-06-03  6:40           ` Andy Lutomirski
2014-06-03  6:51             ` Peter Zijlstra
2014-06-03 10:43             ` Peter Zijlstra
2014-06-03 14:02               ` Peter Zijlstra
2014-06-03 16:05                 ` Andy Lutomirski
2014-06-03 16:19                   ` Peter Zijlstra
2014-06-03 16:52                     ` Andy Lutomirski
2014-06-03 17:00                       ` Peter Zijlstra
2014-06-03 18:28                         ` Peter Zijlstra
2014-06-03 18:44                           ` Andy Lutomirski
2014-06-03 20:07                             ` Andy Lutomirski
2014-04-12  8:35 ` Mike Galbraith

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