Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760630Ab2FUWCk (ORCPT ); Thu, 21 Jun 2012 18:02:40 -0400 Received: from mga01.intel.com ([192.55.52.88]:1314 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760534Ab2FUWCi (ORCPT ); Thu, 21 Jun 2012 18:02:38 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.71,315,1320652800"; d="scan'208";a="168713999" From: Suresh Siddha To: Alexander Gordeev , Ingo Molnar Cc: Suresh Siddha , yinghai@kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org, gorcunov@openvz.org Subject: [PATCH v2 3/3] x86, x2apic: use multiple cluster members for the irq destination only with the explicit affinity Date: Thu, 21 Jun 2012 15:02:25 -0700 Message-Id: <1340316145-4431-4-git-send-email-suresh.b.siddha@intel.com> X-Mailer: git-send-email 1.7.6.5 In-Reply-To: <1340316145-4431-1-git-send-email-suresh.b.siddha@intel.com> References: <1340316145-4431-1-git-send-email-suresh.b.siddha@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2895 Lines: 75 During boot or driver load etc, interrupt destination is setup using default target cpu's. Later the user (irqbalance etc) or the driver (irq_set_affinity/ irq_set_affinity_hint) can request the interrupt to be migrated to some specific set of cpu's. In the x2apic cluster routing, for the default scenario use single cpu as the interrupt destination and when there is an explicit interrupt affinity request, route the interrupt to multiple members of a x2apic cluster specified in the cpumask of the migration request. This will minmize the vector pressure when there are lot of interrupt sources and relatively few x2apic clusters (for example a single socket server). This will allow the performance critical interrupts to be routed to multiple cpu's in the x2apic cluster (irqbalance for example uses the cache siblings etc while specifying the interrupt destination) and allow non-critical interrupts to be serviced by a single logical cpu. Signed-off-by: Suresh Siddha --- arch/x86/kernel/apic/x2apic_cluster.c | 21 +++++++++++++++++++-- 1 files changed, 19 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/apic/x2apic_cluster.c b/arch/x86/kernel/apic/x2apic_cluster.c index bde78d0..c88baa4 100644 --- a/arch/x86/kernel/apic/x2apic_cluster.c +++ b/arch/x86/kernel/apic/x2apic_cluster.c @@ -209,13 +209,30 @@ static int x2apic_cluster_probe(void) return 0; } +static const struct cpumask *x2apic_cluster_target_cpus(void) +{ + return cpu_all_mask; +} + /* * Each x2apic cluster is an allocation domain. */ static void cluster_vector_allocation_domain(int cpu, struct cpumask *retmask, const struct cpumask *mask) { - cpumask_and(retmask, mask, per_cpu(cpus_in_cluster, cpu)); + /* + * To minimize vector pressure, default case of boot, device bringup + * etc will use a single cpu for the interrupt destination. + * + * On explicit migration requests coming from irqbalance etc, + * interrupts will be routed to the x2apic cluster (cluster-id + * derived from the first cpu in the mask) members specified + * in the mask. + */ + if (mask == x2apic_cluster_target_cpus()) + cpumask_copy(retmask, cpumask_of(cpu)); + else + cpumask_and(retmask, mask, per_cpu(cpus_in_cluster, cpu)); } static struct apic apic_x2apic_cluster = { @@ -229,7 +246,7 @@ static struct apic apic_x2apic_cluster = { .irq_delivery_mode = dest_LowestPrio, .irq_dest_mode = 1, /* logical */ - .target_cpus = online_target_cpus, + .target_cpus = x2apic_cluster_target_cpus, .disable_esr = 0, .dest_logical = APIC_DEST_LOGICAL, .check_apicid_used = NULL, -- 1.7.6.5 -- 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/