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,
linux-kernel@vger.kernel.org, hpa@zytor.com, x86@kernel.org,
dave.hansen@linux.intel.com, luto@kernel.org,
len.brown@intel.com, axboe@kernel.dk, dledford@redhat.com,
jeffrey.t.kirsher@intel.com, linux-alpha@vger.kernel.org,
naveen.n.rao@linux.vnet.ibm.com, mwb@linux.vnet.ibm.com,
linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
linux-sh@vger.kernel.org, sparclinux@vger.kernel.org,
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 14:09:43 +0200 [thread overview]
Message-ID: <20190924120943.GP2349@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20190924115401.GM23050@dhcp22.suse.cz>
On Tue, Sep 24, 2019 at 01:54:01PM +0200, Michal Hocko wrote:
> On Tue 24-09-19 13:23:49, Peter Zijlstra wrote:
> > On Tue, Sep 24, 2019 at 12:56:22PM +0200, Michal Hocko wrote:
> [...]
> > > To be honest I really fail to see why to object to a simple semantic
> > > that NUMA_NO_NODE imply all usable cpus. Could you explain that please?
> >
> > Because it feels wrong. The device needs to be _somewhere_. It simply
> > cannot be node-less.
>
> What if it doesn't have any numa preference for what ever reason? There
> is no other way to express that than NUMA_NO_NODE.
Like I said; how does that physically work? The device needs to be
somewhere. It _must_ have a preference.
> Anyway, I am not going to argue more about this because it seems more of
> a discussion about "HW shouldn't be doing that although the specification
> allows that" which cannot really have any outcome except of "feels
> correct/wrong".
We can push back and say we don't respect the specification because it
is batshit insane ;-)
> If you really feel strongly about this then we should think of a proper
> way to prevent this to happen because an out-of-bound access is
> certainly not something we really want, right?
I just genuinely don't understand it. And I refuse to duct tape it.
And as shown in that email here:
https://lkml.kernel.org/r/5a188e2b-6c07-a9db-fbaa-561e9362d3ba@huawei.com
there is a ton of broken...
15.061682] node node0: has invalid NUMA node(-1), default node of 0 now selected. Readjust it by writing to sysfs numa_node or contact your vendor for updates.
...
15.285602] node node3: has invalid NUMA node(-1), default node of 0 now selected. Readjust it by writing to sysfs numa_node or contact your vendor for updates.
15.360241] cpu cpu0: has invalid NUMA node(-1), default node of 0 now selected. Readjust it by writing to sysfs numa_node or contact your vendor for updates.
...
24.768305] cpu cpu127: has invalid NUMA node(-1), default node of 0 now selected. Readjust it by writing to sysfs numa_node or contact your vendor for updates.
39.623339] clockevents clockevent0: has invalid NUMA node(-1), default node of 0 now selected. Readjust it by writing to sysfs numa_node or contact your vendor for updates.
...
48.769530] clockevents clockevent127: has invalid NUMA node(-1), default node of 0 now selected. Readjust it by writing to sysfs numa_node or contact your vendor for updates.
That's all broken for no reason.. those things actually _have_ a trivial
node affinity.
By silently accepting we let this stuff fester.
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:
48.913502] event_source armv8_pmuv3_0: has invalid NUMA node(-1), default node of 0 now selected. Readjust it by writing to sysfs numa_node or contact your vendor for updates.
48.985462] event_source breakpoint: has invalid NUMA node(-1), default node of 0 now selected. Readjust it by writing to sysfs numa_node or contact your vendor for updates.
49.057120] event_source uprobe: has invalid NUMA node(-1), default node of 0 now selected. Readjust it by writing to sysfs numa_node or contact your vendor for updates.
49.128431] event_source kprobe: has invalid NUMA node(-1), default node of 0 now selected. Readjust it by writing to sysfs numa_node or contact your vendor for updates.
49.199742] event_source tracepoint: has invalid NUMA node(-1), default node of 0 now selected. Readjust it by writing to sysfs numa_node or contact your vendor for updates.
49.271399] event_source software: has invalid NUMA node(-1), default node of 0 now selected. Readjust it by writing to sysfs numa_node or contact your vendor for updates.
That's just fake devices to get a sysfs entry.
next prev parent reply other threads:[~2019-09-24 12:10 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-17 12:48 [PATCH v6] numa: make node_to_cpumask_map() NUMA_NO_NODE aware 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 [this message]
2019-09-24 12:25 ` Michal Hocko
2019-09-24 12:43 ` Peter Zijlstra
2019-09-24 12:59 ` Peter Zijlstra
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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