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Re: [Xen-devel] [PATCH v9 03/19] qspinlock: Add pending bit
- To: Ingo Molnar <mingo@xxxxxxxxxx>
- From: Waiman Long <waiman.long@xxxxxx>
- Date: Fri, 18 Apr 2014 12:23:29 -0400
- Cc: linux-arch@xxxxxxxxxxxxxxx, Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>, Gleb Natapov <gleb@xxxxxxxxxx>, kvm@xxxxxxxxxxxxxxx, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Scott J Norton <scott.norton@xxxxxx>, x86@xxxxxxxxxx, Paolo Bonzini <paolo.bonzini@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, Ingo Molnar <mingo@xxxxxxxxxx>, Chegu Vinod <chegu_vinod@xxxxxx>, David Vrabel <david.vrabel@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>
- Delivery-date: Fri, 18 Apr 2014 16:24:08 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On 04/18/2014 03:42 AM, Ingo Molnar wrote:
* Waiman Long<Waiman.Long@xxxxxx> wrote:
Because the qspinlock needs to touch a second cacheline; add a pending
bit and allow a single in-word spinner before we punt to the second
cacheline.
Signed-off-by: Peter Zijlstra<peterz@xxxxxxxxxxxxx>
Signed-off-by: Waiman Long<Waiman.Long@xxxxxx>
This patch should have a "From: Peter" in it as well, right?
Thanks,
Ingo
Do you mean a "From:" line in the mail header? It will be a bit hard to
have different "From:" header in the same patch series. I can certainly
do that if there is an easy way to do it.
-Longman
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