From: Lai Jiangshan <laijs@cn.fujitsu.com>
To: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: <linux-kernel@vger.kernel.org>, Tejun Heo <tj@kernel.org>,
Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>,
"Gu, Zheng" <guz.fnst@cn.fujitsu.com>,
tangchen <tangchen@cn.fujitsu.com>
Subject: Re: [PATCH 2/4] workqueue: update per-cpu workqueue's node affinity at,online-offline
Date: Tue, 16 Dec 2014 13:32:26 +0800 [thread overview]
Message-ID: <548FC3EA.7020505@cn.fujitsu.com> (raw)
In-Reply-To: <548EC320.3060206@jp.fujitsu.com>
On 12/15/2014 07:16 PM, Kamezawa Hiroyuki wrote:
> The percpu workqueue pool are persistend and never be freed.
> But cpu<->node relationship can be changed by cpu hotplug and pool->node
> can point to an offlined node.
>
> If pool->node points to an offlined node,
> following allocation failure can happen.
> ==
> SLUB: Unable to allocate memory on node 2 (gfp=0x80d0)
> cache: kmalloc-192, object size: 192, buffer size: 192, default
> order:
> 1, min order: 0
> node 0: slabs: 6172, objs: 259224, free: 245741
> node 1: slabs: 3261, objs: 136962, free: 127656
> ==
>
> This patch clears per-cpu workqueue pool's node affinity at
> cpu offlining and restore it at cpu onlining.
>
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> ---
> kernel/workqueue.c | 11 ++++++++++-
> 1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/workqueue.c b/kernel/workqueue.c
> index 7809154..2fd0bd7 100644
> --- a/kernel/workqueue.c
> +++ b/kernel/workqueue.c
> @@ -4586,6 +4586,11 @@ static int workqueue_cpu_up_callback(struct notifier_block *nfb,
> case CPU_DOWN_FAILED:
> case CPU_ONLINE:
> mutex_lock(&wq_pool_mutex);
> + /*
> + * now cpu <-> node info is established. update numa node
> + */
> + for_each_cpu_worker_pool(pool, cpu)
> + pool->node = cpu_to_node(cpu);
>
> for_each_pool(pool, pi) {
> mutex_lock(&pool->attach_mutex);
> @@ -4619,6 +4624,7 @@ static int workqueue_cpu_down_callback(struct notifier_block *nfb,
> int cpu = (unsigned long)hcpu;
> struct work_struct unbind_work;
> struct workqueue_struct *wq;
> + struct worker_pool *pool;
>
> switch (action & ~CPU_TASKS_FROZEN) {
> case CPU_DOWN_PREPARE:
> @@ -4626,10 +4632,13 @@ static int workqueue_cpu_down_callback(struct notifier_block *nfb,
> INIT_WORK_ONSTACK(&unbind_work, wq_unbind_fn);
> queue_work_on(cpu, system_highpri_wq, &unbind_work);
>
> - /* update NUMA affinity of unbound workqueues */
> mutex_lock(&wq_pool_mutex);
> + /* update NUMA affinity of unbound workqueues */
> list_for_each_entry(wq, &workqueues, list)
> wq_update_unbound_numa(wq, cpu, false);
> + /* clear per-cpu workqueues's numa affinity. */
> + for_each_cpu_worker_pool(pool, cpu)
> + pool->node = NUMA_NO_NODE; /* restored at online */
If the node is still online, it is better to keep the original pool->node.
> mutex_unlock(&wq_pool_mutex);
>
> /* wait for per-cpu unbinding to finish */
next prev parent reply other threads:[~2014-12-16 5:28 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-12 10:19 [PATCH 0/5] workqueue: fix bug when numa mapping is changed Lai Jiangshan
2014-12-12 10:19 ` [PATCH 1/5] workqueue: fix memory leak in wq_numa_init() Lai Jiangshan
2014-12-12 17:12 ` Tejun Heo
2014-12-15 5:25 ` Lai Jiangshan
2014-12-12 10:19 ` [PATCH 2/5] workqueue: update wq_numa_possible_cpumask Lai Jiangshan
2014-12-12 17:18 ` Tejun Heo
2014-12-15 2:02 ` Lai Jiangshan
2014-12-25 20:16 ` Tejun Heo
2014-12-18 2:22 ` Lai Jiangshan
2014-12-12 10:19 ` [PATCH 3/5] workqueue: fixup existing pool->node Lai Jiangshan
2014-12-12 17:25 ` Tejun Heo
2014-12-15 1:23 ` Lai Jiangshan
2014-12-25 20:14 ` Tejun Heo
2015-01-13 7:08 ` Lai Jiangshan
2015-01-13 15:24 ` Tejun Heo
2014-12-12 10:19 ` [PATCH 4/5] workqueue: update NUMA affinity for the node lost CPU Lai Jiangshan
2014-12-12 17:27 ` Tejun Heo
2014-12-15 1:28 ` Lai Jiangshan
2014-12-25 20:17 ` Tejun Heo
2014-12-12 10:19 ` [PATCH 5/5] workqueue: retry on NUMA_NO_NODE when create_worker() fails Lai Jiangshan
2014-12-12 16:05 ` KOSAKI Motohiro
2014-12-12 17:29 ` KOSAKI Motohiro
2014-12-12 17:29 ` Tejun Heo
2014-12-12 17:13 ` [PATCH 0/5] workqueue: fix bug when numa mapping is changed Yasuaki Ishimatsu
2014-12-15 1:34 ` Lai Jiangshan
2014-12-18 1:50 ` Yasuaki Ishimatsu
2014-12-13 16:27 ` [PATCH 0/4] workqueue: fix bug when numa mapping is changed v2 Kamezawa Hiroyuki
2014-12-13 16:30 ` [PATCH 1/4] workqueue: add a hook for node hotplug Kamezawa Hiroyuki
2014-12-13 16:33 ` [PATCH 2/4] workqueue: add warning if pool->node is offline Kamezawa Hiroyuki
2014-12-13 16:35 ` [PATCH 3/4] workqueue: remove per-node unbound pool when node goes offline Kamezawa Hiroyuki
2014-12-15 2:06 ` Lai Jiangshan
2014-12-15 2:06 ` Kamezawa Hiroyuki
2014-12-13 16:38 ` [PATCH 4/4] workqueue: handle change in cpu-node relationship Kamezawa Hiroyuki
2014-12-15 2:12 ` Lai Jiangshan
2014-12-15 2:20 ` Kamezawa Hiroyuki
2014-12-15 2:48 ` Lai Jiangshan
2014-12-15 2:55 ` Kamezawa Hiroyuki
2014-12-15 3:30 ` Lai Jiangshan
2014-12-15 3:34 ` Lai Jiangshan
2014-12-15 4:04 ` Kamezawa Hiroyuki
2014-12-15 5:19 ` Lai Jiangshan
2014-12-15 5:33 ` Kamezawa Hiroyuki
2014-12-15 11:11 ` [PATCH 0/4] workqueue: fix memory allocation after numa mapping is changed v3 Kamezawa Hiroyuki
2014-12-15 11:14 ` [PATCH 1/4] workqueue:Fix unbound workqueue's node affinity detection Kamezawa Hiroyuki
2014-12-16 5:30 ` Lai Jiangshan
2014-12-16 7:32 ` Kamezawa Hiroyuki
2014-12-16 7:54 ` Lai Jiangshan
2014-12-15 11:16 ` [PATCH 2/4] workqueue: update per-cpu workqueue's node affinity at,online-offline Kamezawa Hiroyuki
2014-12-16 5:32 ` Lai Jiangshan [this message]
2014-12-16 7:25 ` Kamezawa Hiroyuki
2014-12-15 11:18 ` [PATCH 3/4] workqueue: Update workqueue's possible cpumask when a new node, coming up Kamezawa Hiroyuki
2014-12-16 7:49 ` Lai Jiangshan
2014-12-16 8:10 ` Kamezawa Hiroyuki
2014-12-16 8:18 ` Kamezawa Hiroyuki
2014-12-15 11:22 ` [PATCH 4/4] workqueue: Handle cpu-node affinity change at CPU_ONLINE Kamezawa Hiroyuki
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