From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from hera.kernel.org ([140.211.167.34]) by bombadil.infradead.org with esmtps (Exim 4.72 #1 (Red Hat Linux)) id 1Oq7Nc-0004Xi-7F for kexec@lists.infradead.org; Mon, 30 Aug 2010 16:38:44 +0000 Message-ID: <4C7BDE6E.8030107@kernel.org> Date: Mon, 30 Aug 2010 18:38:06 +0200 From: Tejun Heo MIME-Version: 1.0 Subject: Re: kdump regression compared to v2.6.35 References: <1331313838.1541221283181038073.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com> In-Reply-To: <1331313838.1541221283181038073.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: kexec-bounces@lists.infradead.org Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: caiqian@redhat.com Cc: torvalds@linux-foundation.org, linux-next@vger.kernel.org, kexec , linux-kernel Can you please try the following patch? Thanks. diff --git a/kernel/workqueue.c b/kernel/workqueue.c index a2dccfc..f57cd6e 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -1224,6 +1224,8 @@ __acquires(&gcwq->lock) { struct global_cwq *gcwq = worker->gcwq; struct task_struct *task = worker->task; + static unsigned int cnt; + int rc; while (true) { /* @@ -1232,8 +1234,11 @@ __acquires(&gcwq->lock) * it races with cpu hotunplug operation. Verify * against GCWQ_DISASSOCIATED. */ - if (!(gcwq->flags & GCWQ_DISASSOCIATED)) - set_cpus_allowed_ptr(task, get_cpu_mask(gcwq->cpu)); + if (!(gcwq->flags & GCWQ_DISASSOCIATED)) { + rc = set_cpus_allowed_ptr(task, get_cpu_mask(gcwq->cpu)); + if (rc && ++cnt < 10) + printk("XXX set_cpus_allowed_ptr() failed w/ %d\n", rc); + } spin_lock_irq(&gcwq->lock); if (gcwq->flags & GCWQ_DISASSOCIATED) @@ -1985,13 +1990,16 @@ repeat: struct cpu_workqueue_struct *cwq = get_cwq(tcpu, wq); struct global_cwq *gcwq = cwq->gcwq; struct work_struct *work, *n; + bool bound; __set_current_state(TASK_RUNNING); mayday_clear_cpu(cpu, wq->mayday_mask); /* migrate to the target cpu if possible */ rescuer->gcwq = gcwq; - worker_maybe_bind_and_lock(rescuer); + printk("XXX %s: rescuer dispatching to cpu%u\n", wq->name, gcwq->cpu); + bound = worker_maybe_bind_and_lock(rescuer); + printk("XXX %s: rescuer done binding, bound=%d\n", wq->name, bound); /* * Slurp in all works issued via this workqueue and @@ -3558,8 +3566,7 @@ static int __init init_workqueues(void) spin_lock_init(&gcwq->lock); INIT_LIST_HEAD(&gcwq->worklist); gcwq->cpu = cpu; - if (cpu == WORK_CPU_UNBOUND) - gcwq->flags |= GCWQ_DISASSOCIATED; + gcwq->flags |= GCWQ_DISASSOCIATED; INIT_LIST_HEAD(&gcwq->idle_list); for (i = 0; i < BUSY_WORKER_HASH_SIZE; i++) @@ -3583,6 +3590,7 @@ static int __init init_workqueues(void) struct global_cwq *gcwq = get_gcwq(cpu); struct worker *worker; + gcwq->flags &= ~GCWQ_DISASSOCIATED; worker = create_worker(gcwq, true); BUG_ON(!worker); spin_lock_irq(&gcwq->lock); _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec