From: "Srivatsa S. Bhat" <srivatsa@csail.mit.edu>
To: tj@kernel.org, rafael.j.wysocki@intel.com, pjt@google.com,
bigeasy@linutronix.de, arjan@linux.intel.com,
rostedt@goodmis.org, riel@redhat.com, paulmck@linux.vnet.ibm.com,
tglx@linutronix.de, linux-kernel@vger.kernel.org,
mingo@kernel.org, akpm@linux-foundation.org, srivatsa@mit.edu,
peterz@infradead.org, torvalds@linux-foundation.org,
oleg@redhat.com, hpa@zytor.com, rusty@rustcorp.com.au,
linux-tip-commits@vger.kernel.org
Subject: Re: [tip:smp/hotplug] cpu/hotplug: Restructure cpu_up code
Date: Wed, 2 Mar 2016 17:36:23 -0500 [thread overview]
Message-ID: <56D76AE7.6020003@csail.mit.edu> (raw)
In-Reply-To: <tip-ba997462435f48ad1501320e9da8770fd40c59b1@git.kernel.org>
On 3/1/16 2:52 PM, tip-bot for Thomas Gleixner wrote:
> Commit-ID: ba997462435f48ad1501320e9da8770fd40c59b1
> Gitweb: http://git.kernel.org/tip/ba997462435f48ad1501320e9da8770fd40c59b1
> Author: Thomas Gleixner <tglx@linutronix.de>
> AuthorDate: Fri, 26 Feb 2016 18:43:24 +0000
> Committer: Thomas Gleixner <tglx@linutronix.de>
> CommitDate: Tue, 1 Mar 2016 20:36:53 +0100
>
> cpu/hotplug: Restructure cpu_up code
>
> Split out into separate functions, so we can convert it to a state machine.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: linux-arch@vger.kernel.org
> Cc: Rik van Riel <riel@redhat.com>
> Cc: Rafael Wysocki <rafael.j.wysocki@intel.com>
> Cc: "Srivatsa S. Bhat" <srivatsa@mit.edu>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Arjan van de Ven <arjan@linux.intel.com>
> Cc: Sebastian Siewior <bigeasy@linutronix.de>
> Cc: Rusty Russell <rusty@rustcorp.com.au>
> Cc: Steven Rostedt <rostedt@goodmis.org>
> Cc: Oleg Nesterov <oleg@redhat.com>
> Cc: Tejun Heo <tj@kernel.org>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Paul Turner <pjt@google.com>
> Link: http://lkml.kernel.org/r/20160226182340.429389195@linutronix.de
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> ---
Reviewed-by: Srivatsa S. Bhat <srivatsa@csail.mit.edu>
Regards,
Srivatsa S. Bhat
> kernel/cpu.c | 69 +++++++++++++++++++++++++++++++++++++++++-------------------
> 1 file changed, 47 insertions(+), 22 deletions(-)
>
> diff --git a/kernel/cpu.c b/kernel/cpu.c
> index 41a6cb8..15a4136 100644
> --- a/kernel/cpu.c
> +++ b/kernel/cpu.c
> @@ -228,6 +228,43 @@ static int cpu_notify(unsigned long val, unsigned int cpu)
> return __cpu_notify(val, cpu, -1, NULL);
> }
>
> +/* Notifier wrappers for transitioning to state machine */
> +static int notify_prepare(unsigned int cpu)
> +{
> + int nr_calls = 0;
> + int ret;
> +
> + ret = __cpu_notify(CPU_UP_PREPARE, cpu, -1, &nr_calls);
> + if (ret) {
> + nr_calls--;
> + printk(KERN_WARNING "%s: attempt to bring up CPU %u failed\n",
> + __func__, cpu);
> + __cpu_notify(CPU_UP_CANCELED, cpu, nr_calls, NULL);
> + }
> + return ret;
> +}
> +
> +static int notify_online(unsigned int cpu)
> +{
> + cpu_notify(CPU_ONLINE, cpu);
> + return 0;
> +}
> +
> +static int bringup_cpu(unsigned int cpu)
> +{
> + struct task_struct *idle = idle_thread_get(cpu);
> + int ret;
> +
> + /* Arch-specific enabling code. */
> + ret = __cpu_up(cpu, idle);
> + if (ret) {
> + cpu_notify(CPU_UP_CANCELED, cpu);
> + return ret;
> + }
> + BUG_ON(!cpu_online(cpu));
> + return 0;
> +}
> +
> #ifdef CONFIG_HOTPLUG_CPU
>
> static void cpu_notify_nofail(unsigned long val, unsigned int cpu)
> @@ -481,7 +518,7 @@ void smpboot_thread_init(void)
> static int _cpu_up(unsigned int cpu, int tasks_frozen)
> {
> struct task_struct *idle;
> - int ret, nr_calls = 0;
> + int ret;
>
> cpu_hotplug_begin();
>
> @@ -496,33 +533,21 @@ static int _cpu_up(unsigned int cpu, int tasks_frozen)
> goto out;
> }
>
> + cpuhp_tasks_frozen = tasks_frozen;
> +
> ret = smpboot_create_threads(cpu);
> if (ret)
> goto out;
>
> - cpuhp_tasks_frozen = tasks_frozen;
> -
> - ret = __cpu_notify(CPU_UP_PREPARE, cpu, -1, &nr_calls);
> - if (ret) {
> - nr_calls--;
> - pr_warn("%s: attempt to bring up CPU %u failed\n",
> - __func__, cpu);
> - goto out_notify;
> - }
> -
> - /* Arch-specific enabling code. */
> - ret = __cpu_up(cpu, idle);
> -
> - if (ret != 0)
> - goto out_notify;
> - BUG_ON(!cpu_online(cpu));
> + ret = notify_prepare(cpu);
> + if (ret)
> + goto out;
>
> - /* Now call notifier in preparation. */
> - cpu_notify(CPU_ONLINE, cpu);
> + ret = bringup_cpu(cpu);
> + if (ret)
> + goto out;
>
> -out_notify:
> - if (ret != 0)
> - __cpu_notify(CPU_UP_CANCELED, cpu, nr_calls, NULL);
> + notify_online(cpu);
> out:
> cpu_hotplug_done();
>
>
next prev parent reply other threads:[~2016-03-02 22:57 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-26 18:43 [patch 00/20] cpu/hotplug: Core infrastructure for cpu hotplug rework Thomas Gleixner
2016-02-26 18:43 ` [patch 01/20] idle: Move x86ism out of generic code Thomas Gleixner
2016-02-27 20:29 ` Brian Gerst
2016-02-29 19:35 ` Thomas Gleixner
2016-02-29 19:48 ` Will Deacon
2016-02-29 20:06 ` Thomas Gleixner
2016-02-26 18:43 ` [patch 02/20] cpu/hotplug: Restructure FROZEN state handling Thomas Gleixner
2016-03-01 19:51 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-03-02 22:35 ` Srivatsa S. Bhat
2016-03-02 23:43 ` Srivatsa S. Bhat
2016-02-26 18:43 ` [patch 03/20] cpu/hotplug: Restructure cpu_up code Thomas Gleixner
2016-03-01 19:52 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-03-02 22:36 ` Srivatsa S. Bhat [this message]
2016-02-26 18:43 ` [patch 04/20] cpu/hotplug: Split out cpu down functions Thomas Gleixner
2016-03-01 19:52 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-03-02 22:37 ` Srivatsa S. Bhat
2016-02-26 18:43 ` [patch 05/20] cpu/hotplug: Add tracepoints Thomas Gleixner
2016-03-01 19:52 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-02-26 18:43 ` [patch 06/20] cpu/hotplug: Convert to a state machine for the control processor Thomas Gleixner
2016-03-01 19:53 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-03-02 11:23 ` Peter Zijlstra
2016-02-26 18:43 ` [patch 07/20] cpu/hotplug: Convert the hotplugged cpu work to a state machine Thomas Gleixner
2016-03-01 19:53 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-02-26 18:43 ` [patch 08/20] cpu/hotplug: Hand in target state to _cpu_up/down Thomas Gleixner
2016-03-01 19:54 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-02-26 18:43 ` [patch 09/20] cpu/hotplug: Add sysfs state interface Thomas Gleixner
2016-03-01 19:54 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-03-02 12:40 ` Peter Zijlstra
2016-02-26 18:43 ` [patch 10/20] cpu/hotplug: Make target state writeable Thomas Gleixner
2016-02-26 23:46 ` Rafael J. Wysocki
2016-02-27 7:39 ` Thomas Gleixner
2016-02-27 14:43 ` Rafael J. Wysocki
2016-02-28 14:49 ` Thomas Gleixner
2016-02-29 15:49 ` Thomas Gleixner
2016-03-01 1:53 ` Rafael J. Wysocki
2016-03-01 19:55 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-03-02 12:41 ` Peter Zijlstra
2016-03-02 19:57 ` Thomas Gleixner
2016-02-26 18:43 ` [patch 11/20] cpu/hotplug: Implement setup/removal interface Thomas Gleixner
2016-03-01 19:55 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-02-26 18:43 ` [patch 12/20] cpu/hotplug: Move scheduler cpu_online notifier to hotplug core Thomas Gleixner
2016-03-01 19:55 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-02-26 18:43 ` [patch 13/20] cpu/hotplug: Unpark smpboot threads from the state machine Thomas Gleixner
2016-03-01 19:56 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-02-26 18:43 ` [patch 14/20] cpu/hotplug: Split out the state walk into functions Thomas Gleixner
2016-03-01 19:56 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-02-26 18:43 ` [patch 15/20] cpu/hotplug: Create hotplug threads Thomas Gleixner
2016-03-01 19:57 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-02-26 18:43 ` [patch 16/20] cpu/hotplug: Move online calls to hotplugged cpu Thomas Gleixner
2016-03-01 19:57 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-02-26 18:43 ` [patch 17/20] arch/hotplug: Call into idle with a proper state Thomas Gleixner
2016-03-01 19:57 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-02-26 18:43 ` [patch 18/20] cpu/hotplug: Let upcoming cpu bring itself fully up Thomas Gleixner
2016-03-01 19:58 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-03-02 17:28 ` [patch 18/20] " Richard Cochran
2016-02-26 18:43 ` [patch 19/20] cpu/hotplug: Make wait for dead cpu completion based Thomas Gleixner
2016-03-01 19:58 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-02-26 18:43 ` [patch 20/20] rcu: Make CPU_DYING_IDLE an explicit call Thomas Gleixner
2016-02-27 2:14 ` Paul E. McKenney
2016-02-27 2:23 ` Paul E. McKenney
2016-02-27 7:47 ` Thomas Gleixner
2016-02-27 11:05 ` Paul E. McKenney
2016-02-27 11:30 ` Thomas Gleixner
2016-02-27 16:33 ` Paul E. McKenney
2016-03-01 19:58 ` [tip:smp/hotplug] " tip-bot for Thomas Gleixner
2016-03-02 20:11 ` Paul E. McKenney
2016-03-03 7:31 ` Thomas Gleixner
2016-03-03 10:03 ` [tip:smp/hotplug] cpu/hotplug: Plug death reporting race tip-bot for Thomas Gleixner
2016-03-03 14:11 ` Paul E. McKenney
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