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Re: [Xen-devel] [PATCH 05/11] qspinlock: Optimize for smaller NR_CPUS
- To: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>, Waiman.Long@xxxxxx, tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx
- From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
- Date: Wed, 18 Jun 2014 13:39:52 +0200
- Cc: linux-arch@xxxxxxxxxxxxxxx, gleb@xxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, scott.norton@xxxxxx, raghavendra.kt@xxxxxxxxxxxxxxxxxx, paolo.bonzini@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, chegu_vinod@xxxxxx, david.vrabel@xxxxxxxxxx, oleg@xxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, boris.ostrovsky@xxxxxxxxxx, paulmck@xxxxxxxxxxxxxxxxxx, torvalds@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 18 Jun 2014 11:40:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
Il 15/06/2014 14:47, Peter Zijlstra ha scritto:
- for (;;) {
- new = (val & ~_Q_PENDING_MASK) | _Q_LOCKED_VAL;
-
- old = atomic_cmpxchg(&lock->val, val, new);
- if (old == val)
- break;
-
- val = old;
- }
+ clear_pending_set_locked(lock, val);
return;
Might as well add clear_pending_set_locked already in patch 3.
Paolo
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