From: Nicholas Piggin <npiggin@gmail.com>
To: Alex Kogan <alex.kogan@oracle.com>,
arnd@arndb.de, bp@alien8.de, guohanjun@huawei.com, hpa@zytor.com,
jglauber@marvell.com, linux-arch@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux@armlinux.org.uk,
linux-kernel@vger.kernel.org, longman@redhat.com,
mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de,
will.deacon@arm.com, x86@kernel.org
Cc: daniel.m.jordan@oracle.com, dave.dice@oracle.com,
rahul.x.yadav@oracle.com, steven.sistare@oracle.com
Subject: Re: [PATCH v3 0/5] Add NUMA-awareness to qspinlock
Date: Tue, 16 Jul 2019 21:47:27 +1000 [thread overview]
Message-ID: <1563277166.m9swqogbqb.astroid@bobo.none> (raw)
In-Reply-To: <20190715192536.104548-1-alex.kogan@oracle.com>
Alex Kogan's on July 16, 2019 5:25 am:
> Our evaluation shows that CNA also improves performance of user
> applications that have hot pthread mutexes. Those mutexes are
> blocking, and waiting threads park and unpark via the futex
> mechanism in the kernel. Given that kernel futex chains, which
> are hashed by the mutex address, are each protected by a
> chain-specific spin lock, the contention on a user-mode mutex
> translates into contention on a kernel level spinlock.
What applications are those, what performance numbers? Arguably that's
much more interesting than microbenchmarks (which are mainly useful to
help ensure the fast paths are not impacted IMO).
Thanks,
Nick
next prev parent reply other threads:[~2019-07-16 11:47 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-15 19:25 [PATCH v3 0/5] Add NUMA-awareness to qspinlock Alex Kogan
2019-07-15 19:25 ` Alex Kogan
2019-07-15 19:25 ` [PATCH v3 1/5] locking/qspinlock: Make arch_mcs_spin_unlock_contended more generic Alex Kogan
2019-07-15 19:25 ` Alex Kogan
2019-07-16 10:23 ` Peter Zijlstra
2019-07-16 10:23 ` Peter Zijlstra
2019-07-15 19:25 ` [PATCH v3 2/5] locking/qspinlock: Refactor the qspinlock slow path Alex Kogan
2019-07-15 19:25 ` Alex Kogan
2019-07-16 10:20 ` Peter Zijlstra
2019-07-16 10:20 ` Peter Zijlstra
2019-07-16 14:53 ` Alex Kogan
2019-07-16 14:53 ` Alex Kogan
2019-07-16 15:58 ` Peter Zijlstra
2019-07-16 15:58 ` Peter Zijlstra
2019-07-15 19:25 ` [PATCH v3 3/5] locking/qspinlock: Introduce CNA into the slow path of qspinlock Alex Kogan
2019-07-15 19:25 ` Alex Kogan
2019-07-15 21:30 ` Waiman Long
2019-07-15 21:30 ` Waiman Long
2019-07-16 11:04 ` Peter Zijlstra
2019-07-16 11:04 ` Peter Zijlstra
2019-07-16 14:26 ` Alex Kogan
2019-07-16 14:26 ` Alex Kogan
2019-07-16 14:44 ` Waiman Long
2019-07-16 14:44 ` Waiman Long
[not found] ` <aa73b86d-902a-bb6f-d372-8645c8299a6d@redhat.com>
[not found] ` <C1C55A40-FDB1-43B5-B551-F9B8BE776DF8@oracle.com>
2019-07-16 14:50 ` Waiman Long
2019-07-16 14:50 ` Waiman Long
2019-07-17 17:44 ` Alex Kogan
2019-07-17 17:44 ` Alex Kogan
2019-07-17 17:58 ` Waiman Long
2019-07-17 17:58 ` Waiman Long
2019-07-16 11:05 ` Peter Zijlstra
2019-07-16 11:05 ` Peter Zijlstra
2019-07-16 14:30 ` Alex Kogan
2019-07-16 14:30 ` Alex Kogan
2019-07-16 15:50 ` Peter Zijlstra
2019-07-16 15:50 ` Peter Zijlstra
2019-07-16 17:19 ` Alex Kogan
2019-07-16 17:19 ` Alex Kogan
2019-07-16 18:47 ` Peter Zijlstra
2019-07-16 18:47 ` Peter Zijlstra
2019-07-17 8:39 ` Peter Zijlstra
2019-07-17 8:39 ` Peter Zijlstra
2019-07-17 8:59 ` Peter Zijlstra
2019-07-17 8:59 ` Peter Zijlstra
2019-07-17 14:52 ` Alex Kogan
2019-07-17 14:52 ` Alex Kogan
[not found] ` <FFC2D45A-24B3-40E1-ABBB-1D696E830B23@oracle.com>
2019-07-17 15:09 ` Peter Zijlstra
2019-07-17 15:09 ` Peter Zijlstra
2019-07-17 2:16 ` Waiman Long
2019-07-17 2:16 ` Waiman Long
2019-07-17 7:44 ` Peter Zijlstra
2019-07-17 7:44 ` Peter Zijlstra
2019-07-17 13:35 ` Waiman Long
2019-07-17 13:35 ` Waiman Long
2019-07-17 14:42 ` Alex Kogan
2019-07-17 14:42 ` Alex Kogan
2019-07-15 19:25 ` [PATCH v3 4/5] locking/qspinlock: Introduce starvation avoidance into CNA Alex Kogan
2019-07-15 19:25 ` Alex Kogan
2019-07-16 15:59 ` Peter Zijlstra
2019-07-16 15:59 ` Peter Zijlstra
2019-07-15 19:25 ` [PATCH v3 5/5] locking/qspinlock: Introduce the shuffle reduction optimization " Alex Kogan
2019-07-15 19:25 ` Alex Kogan
2019-07-16 11:47 ` Nicholas Piggin [this message]
2019-07-16 11:47 ` [PATCH v3 0/5] Add NUMA-awareness to qspinlock Nicholas Piggin
[not found] ` <7D29555E-8F72-4EDD-8A87-B1A59C3945A6@oracle.com>
2019-07-16 23:07 ` Nicholas Piggin
2019-07-16 23:07 ` Nicholas Piggin
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