From: David Hildenbrand <david@redhat.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Pavel Tatashin <pasha.tatashin@soleen.com>,
Dan Williams <dan.j.williams@intel.com>,
Oscar Salvador <osalvador@suse.de>
Subject: Re: [PATCH v1] drivers/base/memory.c: Don't store end_section_nr in memory blocks
Date: Wed, 31 Jul 2019 16:23:45 +0200 [thread overview]
Message-ID: <21d48bda-dfc8-1c7e-6b3a-81a33c8ea4ac@redhat.com> (raw)
In-Reply-To: <20190731141545.GV9330@dhcp22.suse.cz>
On 31.07.19 16:15, Michal Hocko wrote:
> On Wed 31-07-19 16:04:10, David Hildenbrand wrote:
>> On 31.07.19 15:42, David Hildenbrand wrote:
> [...]
>>> Powerpc userspace queries it:
>>> https://groups.google.com/forum/#!msg/powerpc-utils-devel/dKjZCqpTxus/AwkstV2ABwAJ
>>
>> FWIW, powerpc-utils also uses the "removable" property - which means
>> we're also stuck with that unfortunately. :(
>
> Yeah, I am aware of that and I strongly suspect this is actually in use
> because it is terribly unreliable for any non-idle system. There is
> simply no way to find out whether something is offlinable than to try
> it.
According to the introducing commit "removable" is only used to not even
try some memory blocks (IOW to save cpu cycles) - not treated as a
guaranteed (which is correct).
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2019-07-31 14:23 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-31 12:22 [PATCH v1] drivers/base/memory.c: Don't store end_section_nr in memory blocks David Hildenbrand
2019-07-31 12:43 ` Michal Hocko
2019-07-31 13:12 ` David Hildenbrand
2019-07-31 13:25 ` Michal Hocko
2019-07-31 13:42 ` David Hildenbrand
2019-07-31 14:04 ` David Hildenbrand
2019-07-31 14:15 ` Michal Hocko
2019-07-31 14:23 ` David Hildenbrand [this message]
2019-07-31 14:14 ` Michal Hocko
2019-07-31 14:21 ` David Hildenbrand
2019-07-31 14:37 ` Michal Hocko
2019-07-31 14:43 ` David Hildenbrand
2019-08-01 6:13 ` Michal Hocko
2019-08-01 7:00 ` David Hildenbrand
2019-08-01 8:27 ` Michal Hocko
2019-08-01 8:36 ` David Hildenbrand
2019-07-31 20:57 ` Andrew Morton
2019-08-01 6:48 ` David Hildenbrand
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