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From: Peter Zijlstra <peterz@infradead.org>
To: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Gilad Ben Yossef <giladb@mellanox.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Ingo Molnar <mingo@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Rik van Riel <riel@redhat.com>, Tejun Heo <tj@kernel.org>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Christoph Lameter <cl@linux.com>,
	Viresh Kumar <viresh.kumar@linaro.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Andy Lutomirski <luto@amacapital.net>,
	Michal Hocko <mhocko@suse.com>,
	linux-mm@kvack.org, linux-doc@vger.kernel.org,
	linux-api@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v15 04/13] task_isolation: add initial support
Date: Mon, 29 Aug 2016 18:33:52 +0200	[thread overview]
Message-ID: <20160829163352.GV10153@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <1471382376-5443-5-git-send-email-cmetcalf@mellanox.com>

On Tue, Aug 16, 2016 at 05:19:27PM -0400, Chris Metcalf wrote:
> +	/*
> +	 * Request rescheduling unless we are in full dynticks mode.
> +	 * We would eventually get pre-empted without this, and if
> +	 * there's another task waiting, it would run; but by
> +	 * explicitly requesting the reschedule, we may reduce the
> +	 * latency.  We could directly call schedule() here as well,
> +	 * but since our caller is the standard place where schedule()
> +	 * is called, we defer to the caller.
> +	 *
> +	 * A more substantive approach here would be to use a struct
> +	 * completion here explicitly, and complete it when we shut
> +	 * down dynticks, but since we presumably have nothing better
> +	 * to do on this core anyway, just spinning seems plausible.
> +	 */
> +	if (!tick_nohz_tick_stopped())
> +		set_tsk_need_resched(current);

This is broken.. and it would be really good if you don't actually need
to do this.

  reply	other threads:[~2016-08-29 16:34 UTC|newest]

Thread overview: 80+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-16 21:19 [PATCH v15 00/13] support "task_isolation" mode Chris Metcalf
2016-08-16 21:19 ` [PATCH v15 01/13] vmstat: add quiet_vmstat_sync function Chris Metcalf
2016-08-16 21:19 ` [PATCH v15 02/13] vmstat: add vmstat_idle function Chris Metcalf
2016-08-16 21:19 ` [PATCH v15 03/13] lru_add_drain_all: factor out lru_add_drain_needed Chris Metcalf
2016-08-16 21:19 ` [PATCH v15 04/13] task_isolation: add initial support Chris Metcalf
2016-08-29 16:33   ` Peter Zijlstra [this message]
2016-08-29 16:40     ` Chris Metcalf
2016-08-29 16:48       ` Peter Zijlstra
2016-08-29 16:53         ` Chris Metcalf
2016-08-30  7:59           ` Peter Zijlstra
2016-08-30  7:58       ` Peter Zijlstra
2016-08-30 15:32         ` Chris Metcalf
2016-08-30 16:30           ` Andy Lutomirski
2016-08-30 17:02             ` Chris Metcalf
2016-08-30 18:43               ` Andy Lutomirski
2016-08-30 19:37                 ` Chris Metcalf
2016-08-30 19:50                   ` Andy Lutomirski
2016-09-02 14:04                     ` Chris Metcalf
2016-09-02 17:28                       ` Andy Lutomirski
2016-09-09 17:40                         ` Chris Metcalf
2016-09-12 17:41                           ` Andy Lutomirski
2016-09-12 19:25                             ` Chris Metcalf
2016-09-27 14:22                         ` Frederic Weisbecker
2016-09-27 14:39                           ` Peter Zijlstra
2016-09-27 14:51                             ` Frederic Weisbecker
2016-09-27 14:48                           ` Paul E. McKenney
2016-09-30 16:59                 ` Chris Metcalf
2016-09-01 10:06           ` Peter Zijlstra
2016-09-02 14:03             ` Chris Metcalf
2016-09-02 16:40               ` Peter Zijlstra
2017-02-02 16:13   ` Eugene Syromiatnikov
2017-02-02 18:12     ` Chris Metcalf
2016-08-16 21:19 ` [PATCH v15 05/13] task_isolation: track asynchronous interrupts Chris Metcalf
2016-08-16 21:19 ` [PATCH v15 06/13] arch/x86: enable task isolation functionality Chris Metcalf
2016-08-30 21:46   ` Andy Lutomirski
2016-08-16 21:19 ` [PATCH v15 07/13] arm64: factor work_pending state machine to C Chris Metcalf
2016-08-17  8:05   ` Will Deacon
2016-08-16 21:19 ` [PATCH v15 08/13] arch/arm64: enable task isolation functionality Chris Metcalf
2016-08-26 16:25   ` Catalin Marinas
2016-08-16 21:19 ` [PATCH v15 09/13] arch/tile: " Chris Metcalf
2016-08-16 21:19 ` [PATCH v15 10/13] arm, tile: turn off timer tick for oneshot_stopped state Chris Metcalf
2016-08-16 21:19 ` [PATCH v15 11/13] task_isolation: support CONFIG_TASK_ISOLATION_ALL Chris Metcalf
2016-08-16 21:19 ` [PATCH v15 12/13] task_isolation: add user-settable notification signal Chris Metcalf
2016-08-16 21:19 ` [PATCH v15 13/13] task_isolation self test Chris Metcalf
2016-08-17 19:37 ` [PATCH] Fix /proc/stat freezes (was [PATCH v15] "task_isolation" mode) Christoph Lameter
2016-08-20  1:42   ` Chris Metcalf
2016-09-28 13:16   ` Frederic Weisbecker
2016-08-29 16:27 ` Ping: [PATCH v15 00/13] support "task_isolation" mode Chris Metcalf
2016-09-07 21:11   ` Francis Giraldeau
2016-09-07 21:39     ` Francis Giraldeau
2016-09-08 16:21     ` Francis Giraldeau
2016-09-12 16:01     ` Chris Metcalf
2016-09-12 16:14       ` Peter Zijlstra
2016-09-12 21:15         ` Rafael J. Wysocki
2016-09-13  0:05           ` Rafael J. Wysocki
2016-09-13 16:00             ` Francis Giraldeau
2016-09-13  0:20       ` Francis Giraldeau
2016-09-13 16:12         ` Chris Metcalf
2016-09-27 14:49         ` Frederic Weisbecker
2016-09-27 14:35   ` Frederic Weisbecker
2016-09-30 17:07     ` Chris Metcalf
2016-11-05  4:04 ` task isolation discussion at Linux Plumbers Chris Metcalf
2016-11-05 16:05   ` Christoph Lameter
2016-11-07 16:55   ` Thomas Gleixner
2016-11-07 18:36     ` Thomas Gleixner
2016-11-07 19:12       ` Rik van Riel
2016-11-07 19:16         ` Will Deacon
2016-11-07 19:18           ` Rik van Riel
2016-11-11 20:54     ` Luiz Capitulino
2016-11-09  1:40   ` Paul E. McKenney
2016-11-09 11:14     ` Andy Lutomirski
2016-11-09 17:38       ` Paul E. McKenney
2016-11-09 18:57         ` Will Deacon
2016-11-09 19:11           ` Paul E. McKenney
2016-11-10  1:44         ` Andy Lutomirski
2016-11-10  4:52           ` Paul E. McKenney
2016-11-10  5:10             ` Paul E. McKenney
2016-11-11 17:00             ` Andy Lutomirski
2016-11-09 11:07   ` Frederic Weisbecker
2016-12-19 14:37   ` Paul E. McKenney

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