Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030646Ab3HIOVn (ORCPT ); Fri, 9 Aug 2013 10:21:43 -0400 Received: from e9.ny.us.ibm.com ([32.97.182.139]:54194 "EHLO e9.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030342Ab3HIOTG (ORCPT ); Fri, 9 Aug 2013 10:19:06 -0400 From: Raghavendra K T To: , , , , , , Cc: , , , , , , , , , , , linux-doc@vger.kernel.org, , , , , , , , , , Raghavendra K T Subject: [PATCH V13 11/14] xen/pvticketlock: Allow interrupts to be enabled while blocking Date: Fri, 9 Aug 2013 19:51:59 +0530 Message-Id: <1376058122-8248-12-git-send-email-raghavendra.kt@linux.vnet.ibm.com> X-Mailer: git-send-email 1.7.11.7 In-Reply-To: <1376058122-8248-1-git-send-email-raghavendra.kt@linux.vnet.ibm.com> References: <1376058122-8248-1-git-send-email-raghavendra.kt@linux.vnet.ibm.com> X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13080914-7182-0000-0000-000008089CC1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3931 Lines: 114 From: Jeremy Fitzhardinge If interrupts were enabled when taking the spinlock, we can leave them enabled while blocking to get the lock. If we can enable interrupts while waiting for the lock to become available, and we take an interrupt before entering the poll, and the handler takes a spinlock which ends up going into the slow state (invalidating the per-cpu "lock" and "want" values), then when the interrupt handler returns the event channel will remain pending so the poll will return immediately, causing it to return out to the main spinlock loop. Signed-off-by: Jeremy Fitzhardinge Reviewed-by: Konrad Rzeszutek Wilk Signed-off-by: Raghavendra K T Acked-by: Ingo Molnar --- arch/x86/xen/spinlock.c | 46 ++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 40 insertions(+), 6 deletions(-) diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c index 546112e..0438b93 100644 --- a/arch/x86/xen/spinlock.c +++ b/arch/x86/xen/spinlock.c @@ -142,7 +142,20 @@ static void xen_lock_spinning(struct arch_spinlock *lock, __ticket_t want) * partially setup state. */ local_irq_save(flags); - + /* + * We don't really care if we're overwriting some other + * (lock,want) pair, as that would mean that we're currently + * in an interrupt context, and the outer context had + * interrupts enabled. That has already kicked the VCPU out + * of xen_poll_irq(), so it will just return spuriously and + * retry with newly setup (lock,want). + * + * The ordering protocol on this is that the "lock" pointer + * may only be set non-NULL if the "want" ticket is correct. + * If we're updating "want", we must first clear "lock". + */ + w->lock = NULL; + smp_wmb(); w->want = want; smp_wmb(); w->lock = lock; @@ -157,24 +170,43 @@ static void xen_lock_spinning(struct arch_spinlock *lock, __ticket_t want) /* Only check lock once pending cleared */ barrier(); - /* Mark entry to slowpath before doing the pickup test to make - sure we don't deadlock with an unlocker. */ + /* + * Mark entry to slowpath before doing the pickup test to make + * sure we don't deadlock with an unlocker. + */ __ticket_enter_slowpath(lock); - /* check again make sure it didn't become free while - we weren't looking */ + /* + * check again make sure it didn't become free while + * we weren't looking + */ if (ACCESS_ONCE(lock->tickets.head) == want) { add_stats(TAKEN_SLOW_PICKUP, 1); goto out; } + + /* Allow interrupts while blocked */ + local_irq_restore(flags); + + /* + * If an interrupt happens here, it will leave the wakeup irq + * pending, which will cause xen_poll_irq() to return + * immediately. + */ + /* Block until irq becomes pending (or perhaps a spurious wakeup) */ xen_poll_irq(irq); add_stats(TAKEN_SLOW_SPURIOUS, !xen_test_irq_pending(irq)); + + local_irq_save(flags); + kstat_incr_irqs_this_cpu(irq, irq_to_desc(irq)); out: cpumask_clear_cpu(cpu, &waiting_cpus); w->lock = NULL; + local_irq_restore(flags); + spin_time_accum_blocked(start); } PV_CALLEE_SAVE_REGS_THUNK(xen_lock_spinning); @@ -188,7 +220,9 @@ static void xen_unlock_kick(struct arch_spinlock *lock, __ticket_t next) for_each_cpu(cpu, &waiting_cpus) { const struct xen_lock_waiting *w = &per_cpu(lock_waiting, cpu); - if (w->lock == lock && w->want == next) { + /* Make sure we read lock before want */ + if (ACCESS_ONCE(w->lock) == lock && + ACCESS_ONCE(w->want) == next) { add_stats(RELEASED_SLOW_KICKED, 1); xen_send_IPI_one(cpu, XEN_SPIN_UNLOCK_VECTOR); break; -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/