From: David Hildenbrand <david@redhat.com>
To: Michal Hocko <mhocko@kernel.org>,
Dan Williams <dan.j.williams@intel.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux MM <linux-mm@kvack.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Leonardo Bras <leonardo@linux.ibm.com>,
Nathan Lynch <nathanl@linux.ibm.com>,
Allison Randal <allison@lohutok.net>,
Nathan Fontenot <nfont@linux.vnet.ibm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Anshuman Khandual <anshuman.khandual@arm.com>,
lantianyu1986@gmail.com,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [PATCH RFC v1] mm: is_mem_section_removable() overhaul
Date: Mon, 20 Jan 2020 10:20:46 +0100 [thread overview]
Message-ID: <981134a1-67e3-536d-87d3-ba54f3744bfc@redhat.com> (raw)
In-Reply-To: <a5f0bd8d-de5e-9f27-5c94-7746a3d20a95@redhat.com>
On 20.01.20 10:14, David Hildenbrand wrote:
> On 20.01.20 08:48, Michal Hocko wrote:
>> On Fri 17-01-20 08:57:51, Dan Williams wrote:
>> [...]
>>> Unless the user is willing to hold the device_hotplug_lock over the
>>> evaluation then the result is unreliable.
>>
>> Do we want to hold the device_hotplug_lock from this user readable file
>> in the first place? My book says that this just waits to become a
>> problem.
>
> It was the "big hammer" solution for this RFC.
>
> I think we could do with a try_lock() on the device_lock() paired with a
> device->removed flag. The latter is helpful for properly catching zombie
> devices on the onlining/offlining path either way (and on my todo list).
We do have dev->p->dead which could come in handy.
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2020-01-20 9:20 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-17 10:57 [PATCH RFC v1] mm: is_mem_section_removable() overhaul David Hildenbrand
2020-01-17 11:33 ` Michal Hocko
2020-01-17 13:08 ` David Hildenbrand
2020-01-17 14:52 ` Michal Hocko
2020-01-17 14:58 ` David Hildenbrand
2020-01-17 15:29 ` Michal Hocko
2020-01-17 15:54 ` Dan Williams
2020-01-17 16:10 ` David Hildenbrand
2020-01-17 16:57 ` Dan Williams
2020-01-20 7:48 ` Michal Hocko
2020-01-20 9:14 ` David Hildenbrand
2020-01-20 9:20 ` David Hildenbrand [this message]
2020-01-21 12:07 ` Michal Hocko
2020-01-22 10:39 ` David Hildenbrand
2020-01-22 10:42 ` Michal Hocko
2020-01-22 10:54 ` David Hildenbrand
2020-01-22 11:58 ` David Hildenbrand
2020-01-22 16:46 ` Michal Hocko
2020-01-22 18:15 ` David Hildenbrand
2020-01-22 18:38 ` Michal Hocko
2020-01-22 18:46 ` David Hildenbrand
2020-01-22 19:09 ` Michal Hocko
2020-01-22 20:51 ` Dan Williams
2020-01-22 19:01 ` Michal Hocko
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