From: Catalin Marinas <catalin.marinas@arm.com>
To: Will Deacon <will.deacon@arm.com>
Cc: linux-kernel@vger.kernel.org, peterz@infradead.org,
boqun.feng@gmail.com, longman@redhat.com,
paulmck@linux.vnet.ibm.com, mingo@kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 00/13] kernel/locking: qspinlock improvements
Date: Fri, 13 Apr 2018 10:24:41 +0100 [thread overview]
Message-ID: <20180413092441.cebb54suvjufw6m3@armageddon.cambridge.arm.com> (raw)
In-Reply-To: <1523469680-17699-1-git-send-email-will.deacon@arm.com>
On Wed, Apr 11, 2018 at 07:01:07PM +0100, Will Deacon wrote:
> * Spin for a bounded duration while lock is observed in the
> pending->locked transition
FWIW, I updated my model [1] to include the bounded handover loop and,
as expected, it passes the liveness check (well, assuming fairness of
other operations like fetch_or, cmpxchg etc).
[1] https://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/kernel-tla.git/tree/qspinlock.tla
--
Catalin
prev parent reply other threads:[~2018-04-13 9:24 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-11 18:01 Will Deacon
2018-04-11 18:01 ` [PATCH v2 01/13] barriers: Introduce smp_cond_load_relaxed and atomic_cond_read_relaxed Will Deacon
2018-04-11 18:01 ` [PATCH v2 02/13] locking/qspinlock: Bound spinning on pending->locked transition in slowpath Will Deacon
2018-04-11 18:01 ` [PATCH v2 03/13] locking/qspinlock/x86: Increase _Q_PENDING_LOOPS upper bound Will Deacon
2018-04-11 18:01 ` [PATCH v2 04/13] locking/qspinlock: Remove unbounded cmpxchg loop from locking slowpath Will Deacon
2018-04-11 19:34 ` Waiman Long
2018-04-11 20:35 ` Waiman Long
2018-04-11 19:53 ` Waiman Long
2018-04-12 14:06 ` Will Deacon
2018-04-12 14:16 ` Waiman Long
2018-04-12 14:18 ` Will Deacon
2018-04-11 18:01 ` [PATCH v2 05/13] locking/qspinlock: Kill cmpxchg loop when claiming lock from head of queue Will Deacon
2018-04-11 18:01 ` [PATCH v2 06/13] locking/qspinlock: Use atomic_cond_read_acquire Will Deacon
2018-04-11 18:01 ` [PATCH v2 07/13] locking/mcs: Use smp_cond_load_acquire() in mcs spin loop Will Deacon
2018-04-11 18:01 ` [PATCH v2 08/13] locking/qspinlock: Use smp_cond_load_relaxed to wait for next node Will Deacon
2018-04-11 18:01 ` [PATCH v2 09/13] locking/qspinlock: Merge struct __qspinlock into struct qspinlock Will Deacon
2018-04-11 19:13 ` Waiman Long
2018-04-11 18:01 ` [PATCH v2 10/13] locking/qspinlock: Make queued_spin_unlock use smp_store_release Will Deacon
2018-04-11 18:01 ` [PATCH v2 11/13] locking/qspinlock: Elide back-to-back RELEASE operations with smp_wmb() Will Deacon
2018-04-11 18:01 ` [PATCH v2 12/13] locking/qspinlock: Use try_cmpxchg instead of cmpxchg when locking Will Deacon
2018-04-11 18:01 ` [PATCH v2 13/13] locking/qspinlock: Add stat tracking for pending vs slowpath Will Deacon
2018-04-13 9:24 ` Catalin Marinas [this message]
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