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Message-Id: <1464164289-6124-6-git-send-email-xinhui.pan@linux.vnet.ibm.com> Date: Wed, 25 May 2016 16:18:08 +0800 From: Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com> To: linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, virtualization@...ts.linux-foundation.org Cc: benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au, peterz@...radead.org, mingo@...hat.com, paulmck@...ux.vnet.ibm.com, jeremy@...p.org, chrisw@...s-sol.org, akataria@...are.com, rusty@...tcorp.com.au, Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com> Subject: [PATCH v3 5/6] pv-qspinlock: use cmpxchg_release in __pv_queued_spin_unlock cmpxchg_release is light-wight than cmpxchg, we can gain a better performace then. On some arch like ppc, barrier impact the performace too much. Suggested-by: Boqun Feng <boqun.feng@...il.com> Signed-off-by: Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com> --- kernel/locking/qspinlock_paravirt.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/locking/qspinlock_paravirt.h b/kernel/locking/qspinlock_paravirt.h index a5b1248..2bbffe4 100644 --- a/kernel/locking/qspinlock_paravirt.h +++ b/kernel/locking/qspinlock_paravirt.h @@ -614,7 +614,7 @@ __visible void __pv_queued_spin_unlock(struct qspinlock *lock) * unhash. Otherwise it would be possible to have multiple @lock * entries, which would be BAD. */ - locked = cmpxchg(&l->locked, _Q_LOCKED_VAL, 0); + locked = cmpxchg_release(&l->locked, _Q_LOCKED_VAL, 0); if (likely(locked == _Q_LOCKED_VAL)) return; -- 1.9.1
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