From: Waiman Long <longman@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>, Juergen Gross <jgross@suse.com>
Cc: Alex Kogan <alex.kogan@oracle.com>,
linux@armlinux.org.uk, mingo@redhat.com, will.deacon@arm.com,
arnd@arndb.de, linux-arch@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, tglx@linutronix.de, bp@alien8.de,
hpa@zytor.com, x86@kernel.org, steven.sistare@oracle.com,
daniel.m.jordan@oracle.com, dave.dice@oracle.com,
rahul.x.yadav@oracle.com
Subject: Re: [PATCH v2 3/5] locking/qspinlock: Introduce CNA into the slow path of qspinlock
Date: Thu, 4 Apr 2019 14:03:15 -0400 [thread overview]
Message-ID: <6b5b03ae-d1f4-bfbb-5866-37046c8a47c8@redhat.com> (raw)
In-Reply-To: <20190404093859.GU4038@hirez.programming.kicks-ass.net>
On 04/04/2019 05:38 AM, Peter Zijlstra wrote:
> On Thu, Apr 04, 2019 at 07:05:24AM +0200, Juergen Gross wrote:
>
>> Without PARAVIRT_SPINLOCK this would be just an alternative() then?
> That could maybe work yes. This is all early enough.
Yes, alternative() should work as it is done before SMP boot. The
slowpath should never be executed before SMP boot.
Cheers,
Longman
WARNING: multiple messages have this Message-ID (diff)
From: Waiman Long <longman@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>, Juergen Gross <jgross@suse.com>
Cc: linux-arch@vger.kernel.org, arnd@arndb.de, dave.dice@oracle.com,
x86@kernel.org, will.deacon@arm.com, linux@armlinux.org.uk,
linux-kernel@vger.kernel.org, rahul.x.yadav@oracle.com,
mingo@redhat.com, bp@alien8.de, hpa@zytor.com,
Alex Kogan <alex.kogan@oracle.com>,
steven.sistare@oracle.com, tglx@linutronix.de,
daniel.m.jordan@oracle.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 3/5] locking/qspinlock: Introduce CNA into the slow path of qspinlock
Date: Thu, 4 Apr 2019 14:03:15 -0400 [thread overview]
Message-ID: <6b5b03ae-d1f4-bfbb-5866-37046c8a47c8@redhat.com> (raw)
In-Reply-To: <20190404093859.GU4038@hirez.programming.kicks-ass.net>
On 04/04/2019 05:38 AM, Peter Zijlstra wrote:
> On Thu, Apr 04, 2019 at 07:05:24AM +0200, Juergen Gross wrote:
>
>> Without PARAVIRT_SPINLOCK this would be just an alternative() then?
> That could maybe work yes. This is all early enough.
Yes, alternative() should work as it is done before SMP boot. The
slowpath should never be executed before SMP boot.
Cheers,
Longman
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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-04-04 18:03 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-29 15:20 [PATCH v2 0/5] Add NUMA-awareness to qspinlock Alex Kogan
2019-03-29 15:20 ` Alex Kogan
2019-03-29 15:20 ` [PATCH v2 1/5] locking/qspinlock: Make arch_mcs_spin_unlock_contended more generic Alex Kogan
2019-03-29 15:20 ` Alex Kogan
2019-03-29 15:20 ` [PATCH v2 2/5] locking/qspinlock: Refactor the qspinlock slow path Alex Kogan
2019-03-29 15:20 ` Alex Kogan
2019-03-29 15:20 ` [PATCH v2 3/5] locking/qspinlock: Introduce CNA into the slow path of qspinlock Alex Kogan
2019-03-29 15:20 ` Alex Kogan
2019-04-01 9:06 ` Peter Zijlstra
2019-04-01 9:06 ` Peter Zijlstra
2019-04-01 9:06 ` Peter Zijlstra
2019-04-01 9:33 ` Peter Zijlstra
2019-04-01 9:33 ` Peter Zijlstra
2019-04-01 9:33 ` Peter Zijlstra
2019-04-03 15:53 ` Alex Kogan
2019-04-03 15:53 ` Alex Kogan
2019-04-03 16:10 ` Peter Zijlstra
2019-04-03 16:10 ` Peter Zijlstra
2019-04-03 16:10 ` Peter Zijlstra
2019-04-01 9:21 ` Peter Zijlstra
2019-04-01 9:21 ` Peter Zijlstra
2019-04-01 14:36 ` Waiman Long
2019-04-01 14:36 ` Waiman Long
2019-04-02 9:43 ` Peter Zijlstra
2019-04-02 9:43 ` Peter Zijlstra
2019-04-02 9:43 ` Peter Zijlstra
2019-04-03 15:39 ` Alex Kogan
2019-04-03 15:39 ` Alex Kogan
2019-04-03 15:48 ` Waiman Long
2019-04-03 15:48 ` Waiman Long
2019-04-03 16:01 ` Peter Zijlstra
2019-04-03 16:01 ` Peter Zijlstra
2019-04-04 5:05 ` Juergen Gross
2019-04-04 5:05 ` Juergen Gross
2019-04-04 9:38 ` Peter Zijlstra
2019-04-04 9:38 ` Peter Zijlstra
2019-04-04 9:38 ` Peter Zijlstra
2019-04-04 18:03 ` Waiman Long [this message]
2019-04-04 18:03 ` Waiman Long
2019-06-04 23:21 ` Alex Kogan
2019-06-04 23:21 ` Alex Kogan
2019-06-05 20:40 ` Peter Zijlstra
2019-06-05 20:40 ` Peter Zijlstra
2019-06-06 15:21 ` Alex Kogan
2019-06-06 15:21 ` Alex Kogan
2019-06-06 15:32 ` Waiman Long
2019-06-06 15:32 ` Waiman Long
2019-06-06 15:42 ` Waiman Long
2019-06-06 15:42 ` Waiman Long
2019-04-03 16:33 ` Waiman Long
2019-04-03 16:33 ` Waiman Long
2019-04-03 17:16 ` Peter Zijlstra
2019-04-03 17:16 ` Peter Zijlstra
2019-04-03 17:16 ` Peter Zijlstra
2019-04-03 17:40 ` Waiman Long
2019-04-03 17:40 ` Waiman Long
2019-04-04 2:02 ` Hanjun Guo
2019-04-04 2:02 ` Hanjun Guo
2019-04-04 2:02 ` Hanjun Guo
2019-04-04 3:14 ` Alex Kogan
2019-04-04 3:14 ` Alex Kogan
2019-06-11 4:22 ` liwei (GF)
2019-06-11 4:22 ` liwei (GF)
2019-06-11 4:22 ` liwei (GF)
2019-06-12 4:38 ` Alex Kogan
2019-06-12 4:38 ` Alex Kogan
2019-06-12 15:05 ` Waiman Long
2019-06-12 15:05 ` Waiman Long
2019-03-29 15:20 ` [PATCH v2 4/5] locking/qspinlock: Introduce starvation avoidance into CNA Alex Kogan
2019-03-29 15:20 ` Alex Kogan
2019-04-02 10:37 ` Peter Zijlstra
2019-04-02 10:37 ` Peter Zijlstra
2019-04-02 10:37 ` Peter Zijlstra
2019-04-03 17:06 ` Alex Kogan
2019-04-03 17:06 ` Alex Kogan
2019-03-29 15:20 ` [PATCH v2 5/5] locking/qspinlock: Introduce the shuffle reduction optimization " Alex Kogan
2019-03-29 15:20 ` Alex Kogan
2019-04-01 9:09 ` [PATCH v2 0/5] Add NUMA-awareness to qspinlock Peter Zijlstra
2019-04-01 9:09 ` Peter Zijlstra
2019-04-01 9:09 ` Peter Zijlstra
2019-04-03 17:13 ` Alex Kogan
2019-04-03 17:13 ` Alex Kogan
2019-07-03 11:57 ` Jan Glauber
2019-07-03 11:58 ` Jan Glauber
2019-07-12 8:12 ` Hanjun Guo
2019-07-12 8:12 ` Hanjun Guo
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