794737dac2
fix compile error in drbd_req.c for improper usage of request queue API; fix warning in kernel/bpf/core.c for implicit declaration trace call for CFLAG -Werror-implicit-function-declaration remove patch change is_swiotlb_buffer in lib/swiotlb.c As change already in new kernel code base Story: 2004521 Task: 28260 Depends-On: https://review.openstack.org/625773/ Change-Id: I4a3af98b6efe6d31e66db39302f3af8c4ff19d2c Signed-off-by: Martin, Chen <haochuan.z.chen@intel.com>
74 lines
2.7 KiB
Diff
74 lines
2.7 KiB
Diff
From e223cda3a8edd8fd935d589231c8e19a66bd8947 Mon Sep 17 00:00:00 2001
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Message-Id: <e223cda3a8edd8fd935d589231c8e19a66bd8947.1527544850.git.Jim.Somerville@windriver.com>
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In-Reply-To: <b6ceef1c915827b50ce3f76da4dc47f3eb768b44.1527544850.git.Jim.Somerville@windriver.com>
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References: <b6ceef1c915827b50ce3f76da4dc47f3eb768b44.1527544850.git.Jim.Somerville@windriver.com>
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From: Chris Friesen <chris.friesen@windriver.com>
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Date: Tue, 24 Nov 2015 16:27:29 -0500
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Subject: [PATCH 06/26] Affine irqs and workqueues with kthread_cpus
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If the kthread_cpus boot arg is set it means we want to affine
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kernel threads to the specified CPU mask as much as possible
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in order to avoid doing work on other CPUs.
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In this commit we extend the meaning of that boot arg to also
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apply to the CPU affinity of unbound and ordered workqueues.
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We also use the kthread_cpus value to determine the default irq
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affinity. Specifically, as long as the previously-calculated
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irq affinity intersects with the kthread_cpus affinity then we'll
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use the intersection of the two as the default irq affinity.
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Signed-off-by: Chris Friesen <chris.friesen@windriver.com>
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[VT: replacing spaces with tabs. Performed tests]
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Signed-off-by: Vu Tran <vu.tran@windriver.com>
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Signed-off-by: Jim Somerville <Jim.Somerville@windriver.com>
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---
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kernel/irq/manage.c | 7 +++++++
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kernel/workqueue.c | 4 ++++
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2 files changed, 11 insertions(+)
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diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
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index e639145..be46349 100644
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--- a/kernel/irq/manage.c
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+++ b/kernel/irq/manage.c
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@@ -372,6 +372,13 @@ setup_affinity(unsigned int irq, struct irq_desc *desc, struct cpumask *mask)
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if (cpumask_intersects(mask, nodemask))
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cpumask_and(mask, mask, nodemask);
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}
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+
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+ /* This will narrow down the affinity further if we've specified
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+ * a reduced cpu_kthread_mask in the boot args.
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+ */
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+ if (cpumask_intersects(mask, cpu_kthread_mask))
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+ cpumask_and(mask, mask, cpu_kthread_mask);
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+
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irq_do_set_affinity(&desc->irq_data, mask, false);
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return 0;
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}
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diff --git a/kernel/workqueue.c b/kernel/workqueue.c
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index 179cbb2..9524a6f 100644
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--- a/kernel/workqueue.c
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+++ b/kernel/workqueue.c
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@@ -5441,6 +5441,8 @@ static int __init init_workqueues(void)
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BUG_ON(!(attrs = alloc_workqueue_attrs(GFP_KERNEL)));
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attrs->nice = std_nice[i];
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+ /* If we've specified a kthread mask apply it here too. */
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+ cpumask_copy(attrs->cpumask, cpu_kthread_mask);
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unbound_std_wq_attrs[i] = attrs;
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/*
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@@ -5451,6 +5453,8 @@ static int __init init_workqueues(void)
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BUG_ON(!(attrs = alloc_workqueue_attrs(GFP_KERNEL)));
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attrs->nice = std_nice[i];
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attrs->no_numa = true;
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+ /* If we've specified a kthread mask apply it here too. */
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+ cpumask_copy(attrs->cpumask, cpu_kthread_mask);
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ordered_wq_attrs[i] = attrs;
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}
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--
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1.8.3.1
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