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From: Peter Zijlstra <peterz@infradead.org>
To: Michal Hocko <mhocko@kernel.org>
Cc: Yunsheng Lin <linyunsheng@huawei.com>,
	catalin.marinas@arm.com, will@kernel.org, mingo@redhat.com,
	bp@alien8.de, rth@twiddle.net, ink@jurassic.park.msu.ru,
	mattst88@gmail.com, benh@kernel.crashing.org, paulus@samba.org,
	mpe@ellerman.id.au, heiko.carstens@de.ibm.com, gor@linux.ibm.com,
	borntraeger@de.ibm.com, ysato@users.sourceforge.jp,
	dalias@libc.org, davem@davemloft.net, ralf@linux-mips.org,
	paul.burton@mips.com, jhogan@kernel.org, jiaxun.yang@flygoat.com,
	chenhc@lemote.com, akpm@linux-foundation.org, rppt@linux.ibm.com,
	anshuman.khandual@arm.com, tglx@linutronix.de, cai@lca.pw,
	robin.murphy@arm.com, linux-arm-kernel@lists.infradead.org,
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	jeffrey.t.kirsher@intel.com, linux-alpha@vger.kernel.org,
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	linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
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	tbogendoerfer@suse.de, linux-mips@vger.kernel.org,
	rafael@kernel.org, gregkh@linuxfoundation.org
Subject: Re: [PATCH v6] numa: make node_to_cpumask_map() NUMA_NO_NODE aware
Date: Tue, 24 Sep 2019 14:59:36 +0200
Message-ID: <20190924125936.GR2349@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20190924124325.GQ2349@hirez.programming.kicks-ass.net>

On Tue, Sep 24, 2019 at 02:43:25PM +0200, Peter Zijlstra wrote:
> On Tue, Sep 24, 2019 at 02:25:00PM +0200, Michal Hocko wrote:
> > On Tue 24-09-19 14:09:43, Peter Zijlstra wrote:
> 
> > > We can push back and say we don't respect the specification because it
> > > is batshit insane ;-)
> > 
> > Here is my fingers crossed.
> > 
> > [...]
> > 
> > > Now granted; there's a number of virtual devices that really don't have
> > > a node affinity, but then, those are not hurt by forcing them onto a
> > > random node, they really don't do anything. Like:
> > 
> > Do you really consider a random node a better fix than simply living
> > with a more robust NUMA_NO_NODE which tells the actual state? Page
> > allocator would effectivelly use the local node in that case. Any code
> > using the cpumask will know that any of the online cpus are usable.
> 
> For the pmu devices? Yes, those 'devices' aren't actually used for
> anything other than sysfs entries.
> 
> Nothing else uses the struct device.

The below would get rid of the PMU and workqueue warnings with no
side-effects (the device isn't used for anything except sysfs).

I'm stuck in the device code for BDIs, I can't find a sane place to set
the node before it gets added, due to it using device_create_vargs().

---
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 4f08b17d6426..2a64dcc3d70f 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -9965,6 +9965,7 @@ static int pmu_dev_alloc(struct pmu *pmu)
 	if (!pmu->dev)
 		goto out;
 
+	set_dev_node(pmu->dev, 0);
 	pmu->dev->groups = pmu->attr_groups;
 	device_initialize(pmu->dev);
 	ret = dev_set_name(pmu->dev, "%s", pmu->name);
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index bc2e09a8ea61..efafc4590bbe 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -5613,6 +5613,7 @@ int workqueue_sysfs_register(struct workqueue_struct *wq)
 	wq_dev->dev.bus = &wq_subsys;
 	wq_dev->dev.release = wq_device_release;
 	dev_set_name(&wq_dev->dev, "%s", wq->name);
+	set_dev_node(wq_dev, 0);
 
 	/*
 	 * unbound_attrs are created separately.  Suppress uevent until

  reply index

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-17 12:48 Yunsheng Lin
2019-09-23 15:15 ` Peter Zijlstra
2019-09-23 15:28   ` Michal Hocko
2019-09-23 15:48     ` Peter Zijlstra
2019-09-23 16:52       ` Michal Hocko
2019-09-23 20:34         ` Peter Zijlstra
2019-09-24  1:29           ` Yunsheng Lin
2019-09-24  9:25             ` Peter Zijlstra
2019-09-24 11:07               ` Yunsheng Lin
2019-09-24 11:28                 ` Peter Zijlstra
2019-09-24 11:44                   ` Yunsheng Lin
2019-09-24 11:58                     ` Peter Zijlstra
2019-09-24 12:09                       ` Yunsheng Lin
2019-09-24  7:47           ` Michal Hocko
2019-09-24  9:17             ` Peter Zijlstra
2019-09-24 10:56               ` Michal Hocko
2019-09-24 11:23                 ` Peter Zijlstra
2019-09-24 11:54                   ` Michal Hocko
2019-09-24 12:09                     ` Peter Zijlstra
2019-09-24 12:25                       ` Michal Hocko
2019-09-24 12:43                         ` Peter Zijlstra
2019-09-24 12:59                           ` Peter Zijlstra [this message]
2019-09-24 13:19                             ` Michal Hocko
2019-09-25  9:14                               ` Yunsheng Lin
2019-09-25 10:41                                 ` Peter Zijlstra
2019-10-08  8:38                                   ` Yunsheng Lin
2019-10-09 12:25                                     ` Robin Murphy
2019-10-10  6:07                                       ` Yunsheng Lin
2019-10-10  7:32                                         ` Michal Hocko
2019-10-11  3:27                                           ` Yunsheng Lin
2019-10-11 11:15                                             ` Peter Zijlstra
2019-10-12  6:17                                               ` Yunsheng Lin
2019-10-12  7:40                                                 ` Greg KH
2019-10-12  9:47                                                   ` Yunsheng Lin
2019-10-12 10:40                                                     ` Greg KH
2019-10-12 10:47                                                       ` Greg KH
2019-10-14  8:00                                                         ` Yunsheng Lin
2019-10-14  9:25                                                           ` Greg KH
2019-10-14  9:49                                                             ` Peter Zijlstra
2019-10-14 10:04                                                               ` Greg KH
2019-10-15 10:40                                                             ` Yunsheng Lin
2019-10-15 16:58                                                               ` Greg KH
2019-10-16 12:07                                                                 ` Yunsheng Lin
2019-10-28  9:20                                                   ` Yunsheng Lin
2019-10-29  8:53                                                     ` Michal Hocko
2019-10-30  1:58                                                       ` Yunsheng Lin
2019-10-10  8:56                                       ` Peter Zijlstra
2019-09-25 10:40                               ` Peter Zijlstra
2019-09-25 13:25                                 ` Michal Hocko
2019-09-25 16:31                                   ` Peter Zijlstra
2019-09-25 21:45                                     ` Peter Zijlstra
2019-09-26  9:05                                       ` Peter Zijlstra
2019-09-26 12:10                                         ` Peter Zijlstra

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