From: Waiman Long <longman@redhat.com>
To: paulmck@kernel.org
Cc: Alex Kogan <alex.kogan@oracle.com>,
linux@armlinux.org.uk, Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Will Deacon <will.deacon@arm.com>,
Arnd Bergmann <arnd@arndb.de>,
linux-arch@vger.kernel.org,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
linux-kernel@vger.kernel.org, tglx@linutronix.de, bp@alien8.de,
hpa@zytor.com, x86@kernel.org, guohanjun@huawei.com,
jglauber@marvell.com, dave.dice@oracle.com,
steven.sistare@oracle.com, daniel.m.jordan@oracle.com
Subject: Re: [PATCH v9 0/5] Add NUMA-awareness to qspinlock
Date: Sat, 25 Jan 2020 14:41:39 -0500 [thread overview]
Message-ID: <967f99ee-b781-43f4-d8ba-af83786c429c@redhat.com> (raw)
In-Reply-To: <20200125045844.GC2935@paulmck-ThinkPad-P72>
On 1/24/20 11:58 PM, Paul E. McKenney wrote:
> On Fri, Jan 24, 2020 at 09:17:05PM -0500, Waiman Long wrote:
>> On 1/24/20 8:59 PM, Waiman Long wrote:
>>>> You called it! I will play with QEMU's -numa argument to see if I can get
>>>> CNA to run for me. Please accept my apologies for the false alarm.
>>>>
>>>> Thanx, Paul
>>>>
>>> CNA is not currently supported in a VM guest simply because the numa
>>> information is not reliable. You will have to run it on baremetal to
>>> test it. Sorry for that.
>> Correction. There is a command line option to force CNA lock to be used
>> in a VM. Use the "numa_spinlock=on" boot command line parameter.
> As I understand it, I need to use a series of -numa arguments to qemu
> combined with the numa_spinlock=on (or =1) on the kernel command line.
> If the kernel thinks that there is only one NUMA node, it appears to
> avoid doing CNA.
>
> Correct?
>
> Thanx, Paul
>
In auto-detection mode (the default), CNA will only be turned on when
paravirt qspinlock is not enabled first and there are at least 2 numa
nodes. The "numa_spinlock=on" option will force it on even when both of
the above conditions are false.
Cheers,
Longman
WARNING: multiple messages have this Message-ID (diff)
From: Waiman Long <longman@redhat.com>
To: paulmck@kernel.org
Cc: linux-arch@vger.kernel.org, guohanjun@huawei.com,
Arnd Bergmann <arnd@arndb.de>,
Peter Zijlstra <peterz@infradead.org>,
dave.dice@oracle.com, jglauber@marvell.com, x86@kernel.org,
Will Deacon <will.deacon@arm.com>,
linux@armlinux.org.uk, linux-kernel@vger.kernel.org,
Ingo Molnar <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 <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v9 0/5] Add NUMA-awareness to qspinlock
Date: Sat, 25 Jan 2020 14:41:39 -0500 [thread overview]
Message-ID: <967f99ee-b781-43f4-d8ba-af83786c429c@redhat.com> (raw)
In-Reply-To: <20200125045844.GC2935@paulmck-ThinkPad-P72>
On 1/24/20 11:58 PM, Paul E. McKenney wrote:
> On Fri, Jan 24, 2020 at 09:17:05PM -0500, Waiman Long wrote:
>> On 1/24/20 8:59 PM, Waiman Long wrote:
>>>> You called it! I will play with QEMU's -numa argument to see if I can get
>>>> CNA to run for me. Please accept my apologies for the false alarm.
>>>>
>>>> Thanx, Paul
>>>>
>>> CNA is not currently supported in a VM guest simply because the numa
>>> information is not reliable. You will have to run it on baremetal to
>>> test it. Sorry for that.
>> Correction. There is a command line option to force CNA lock to be used
>> in a VM. Use the "numa_spinlock=on" boot command line parameter.
> As I understand it, I need to use a series of -numa arguments to qemu
> combined with the numa_spinlock=on (or =1) on the kernel command line.
> If the kernel thinks that there is only one NUMA node, it appears to
> avoid doing CNA.
>
> Correct?
>
> Thanx, Paul
>
In auto-detection mode (the default), CNA will only be turned on when
paravirt qspinlock is not enabled first and there are at least 2 numa
nodes. The "numa_spinlock=on" option will force it on even when both of
the above conditions are false.
Cheers,
Longman
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-01-25 19:41 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-15 3:59 [PATCH v9 0/5] Add NUMA-awareness to qspinlock Alex Kogan
2020-01-15 3:59 ` Alex Kogan
2020-01-15 3:59 ` [PATCH v9 1/5] locking/qspinlock: Rename mcs lock/unlock macros and make them more generic Alex Kogan
2020-01-15 3:59 ` Alex Kogan
2020-01-15 3:59 ` [PATCH v9 2/5] locking/qspinlock: Refactor the qspinlock slow path Alex Kogan
2020-01-15 3:59 ` Alex Kogan
2020-01-15 3:59 ` Alex Kogan
2020-01-15 3:59 ` [PATCH v9 3/5] locking/qspinlock: Introduce CNA into the slow path of qspinlock Alex Kogan
2020-01-15 3:59 ` Alex Kogan
2020-01-15 3:59 ` Alex Kogan
2020-01-23 9:26 ` Peter Zijlstra
2020-01-23 9:26 ` Peter Zijlstra
2020-01-23 9:26 ` Peter Zijlstra
2020-01-23 10:06 ` Peter Zijlstra
2020-01-23 10:06 ` Peter Zijlstra
2020-01-23 10:06 ` Peter Zijlstra
2020-01-23 10:16 ` Peter Zijlstra
2020-01-23 10:16 ` Peter Zijlstra
2020-01-23 10:16 ` Peter Zijlstra
2020-01-23 11:22 ` Will Deacon
2020-01-23 11:22 ` Will Deacon
2020-01-23 13:17 ` Peter Zijlstra
2020-01-23 13:17 ` Peter Zijlstra
2020-01-23 13:17 ` Peter Zijlstra
2020-01-23 14:15 ` Waiman Long
2020-01-23 14:15 ` Waiman Long
2020-01-23 15:29 ` Peter Zijlstra
2020-01-23 15:29 ` Peter Zijlstra
2020-01-23 15:29 ` Peter Zijlstra
2020-01-15 3:59 ` [PATCH v9 4/5] locking/qspinlock: Introduce starvation avoidance into CNA Alex Kogan
2020-01-15 3:59 ` Alex Kogan
2020-01-23 19:55 ` Waiman Long
2020-01-23 19:55 ` Waiman Long
2020-01-23 20:39 ` Waiman Long
2020-01-23 20:39 ` Waiman Long
2020-01-23 23:39 ` Alex Kogan
2020-01-23 23:39 ` Alex Kogan
2020-01-15 3:59 ` [PATCH v9 5/5] locking/qspinlock: Introduce the shuffle reduction optimization " Alex Kogan
2020-01-15 3:59 ` Alex Kogan
2020-03-02 1:14 ` [locking/qspinlock] 7b6da71157: unixbench.score 8.4% improvement kernel test robot
2020-03-02 1:14 ` kernel test robot
2020-03-02 1:14 ` kernel test robot
2020-01-22 11:45 ` [PATCH v9 0/5] Add NUMA-awareness to qspinlock Lihao Liang
2020-01-22 11:45 ` Lihao Liang
2020-01-22 17:24 ` Waiman Long
2020-01-22 17:24 ` Waiman Long
2020-01-23 11:35 ` Will Deacon
2020-01-23 11:35 ` Will Deacon
2020-01-23 15:25 ` Waiman Long
2020-01-23 15:25 ` Waiman Long
2020-01-23 19:08 ` Waiman Long
2020-01-23 19:08 ` Waiman Long
2020-01-22 19:29 ` Alex Kogan
2020-01-22 19:29 ` Alex Kogan
2020-01-26 0:32 ` Lihao Liang
2020-01-26 0:32 ` Lihao Liang
2020-01-26 1:58 ` Lihao Liang
2020-01-26 1:58 ` Lihao Liang
2020-01-26 1:58 ` Lihao Liang
2020-01-27 16:01 ` Alex Kogan
2020-01-27 16:01 ` Alex Kogan
2020-01-29 1:39 ` Lihao Liang
2020-01-29 1:39 ` Lihao Liang
2020-01-27 6:16 ` Alex Kogan
2020-01-27 6:16 ` Alex Kogan
2020-01-24 22:24 ` Paul E. McKenney
2020-01-24 22:24 ` Paul E. McKenney
[not found] ` <6AAE7FC6-F5DE-4067-8BC4-77F27948CD09@oracle.com>
2020-01-25 0:57 ` Paul E. McKenney
2020-01-25 0:57 ` Paul E. McKenney
2020-01-25 1:59 ` Waiman Long
2020-01-25 1:59 ` Waiman Long
[not found] ` <adb4fb09-f374-4d64-096b-ba9ad8b35fd5@redhat.com>
2020-01-25 4:58 ` Paul E. McKenney
2020-01-25 4:58 ` Paul E. McKenney
2020-01-25 19:41 ` Waiman Long [this message]
2020-01-25 19:41 ` Waiman Long
2020-01-26 15:35 ` Paul E. McKenney
2020-01-26 15:35 ` Paul E. McKenney
2020-01-26 22:42 ` Paul E. McKenney
2020-01-26 22:42 ` Paul E. McKenney
2020-01-26 23:32 ` Paul E. McKenney
2020-01-26 23:32 ` Paul E. McKenney
2020-01-27 6:04 ` Alex Kogan
2020-01-27 6:04 ` Alex Kogan
2020-01-27 14:11 ` Waiman Long
2020-01-27 14:11 ` Waiman Long
2020-01-27 15:09 ` Paul E. McKenney
2020-01-27 15:09 ` Paul E. McKenney
[not found] ` <9b3a3f16-5405-b6d1-d023-b85f4aab46dd@redhat.com>
2020-01-27 17:17 ` Waiman Long
2020-01-27 17:17 ` Waiman Long
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=967f99ee-b781-43f4-d8ba-af83786c429c@redhat.com \
--to=longman@redhat.com \
--cc=alex.kogan@oracle.com \
--cc=arnd@arndb.de \
--cc=bp@alien8.de \
--cc=daniel.m.jordan@oracle.com \
--cc=dave.dice@oracle.com \
--cc=guohanjun@huawei.com \
--cc=hpa@zytor.com \
--cc=jglauber@marvell.com \
--cc=linux-arch@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@armlinux.org.uk \
--cc=mingo@redhat.com \
--cc=paulmck@kernel.org \
--cc=peterz@infradead.org \
--cc=steven.sistare@oracle.com \
--cc=tglx@linutronix.de \
--cc=will.deacon@arm.com \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.