From: David Hildenbrand <david@redhat.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linuxppc-dev@lists.ozlabs.org, linux-hyperv@vger.kernel.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Oscar Salvador <osalvador@suse.de>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Baoquan He <bhe@redhat.com>, Wei Yang <richard.weiyang@gmail.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Wei Liu <wei.liu@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH v1 4/5] mm/memory_hotplug: convert memhp_auto_online to store an online_type
Date: Mon, 16 Mar 2020 16:34:06 +0100 [thread overview]
Message-ID: <f6088e93-9cb6-08ee-ac89-8cab289dc460@redhat.com> (raw)
In-Reply-To: <20200316152459.GV11482@dhcp22.suse.cz>
On 16.03.20 16:24, Michal Hocko wrote:
> On Wed 11-03-20 13:30:25, David Hildenbrand wrote:
> [...]
>> diff --git a/arch/powerpc/platforms/powernv/memtrace.c b/arch/powerpc/platforms/powernv/memtrace.c
>> index d6d64f8718e6..e15a600cfa4d 100644
>> --- a/arch/powerpc/platforms/powernv/memtrace.c
>> +++ b/arch/powerpc/platforms/powernv/memtrace.c
>> @@ -235,7 +235,7 @@ static int memtrace_online(void)
>> * If kernel isn't compiled with the auto online option
>> * we need to online the memory ourselves.
>> */
>> - if (!memhp_auto_online) {
>> + if (memhp_default_online_type == MMOP_OFFLINE) {
>> lock_device_hotplug();
>> walk_memory_blocks(ent->start, ent->size, NULL,
>> online_mem_block);
>
> Whut? This stinks, doesn't it. For your defense, the original code is
> fishy already but this just makes it even more ugly.
PPC64 onlines all memory directly from the kernel, and not triggered by
user space (I think that's ugly and not desired, but it is what it is
and I am not going to touch that).
See
arch/powerpc/platforms/pseries/hotplug-memory.c:dlpar_change_lmb_state().
Best I can do here is to also always online all memory.
What are your suggestions?
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2020-03-16 15:34 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-11 12:30 [PATCH v1 0/5] mm/memory_hotplug: allow to specify a default online_type David Hildenbrand
2020-03-11 12:30 ` [PATCH v1 1/5] drivers/base/memory: rename MMOP_ONLINE_KEEP to MMOP_ONLINE David Hildenbrand
2020-03-11 14:17 ` Wei Yang
2020-03-16 15:12 ` Michal Hocko
2020-03-16 15:17 ` David Hildenbrand
2020-03-11 12:30 ` [PATCH v1 2/5] drivers/base/memory: map MMOP_OFFLINE to 0 David Hildenbrand
2020-03-11 14:18 ` Wei Yang
2020-03-16 15:19 ` Michal Hocko
2020-03-11 12:30 ` [PATCH v1 3/5] drivers/base/memory: store mapping between MMOP_* and string in an array David Hildenbrand
2020-03-11 14:20 ` Wei Yang
2020-03-11 14:27 ` Wei Yang
2020-03-16 15:20 ` Michal Hocko
2020-03-11 12:30 ` [PATCH v1 4/5] mm/memory_hotplug: convert memhp_auto_online to store an online_type David Hildenbrand
2020-03-11 14:25 ` Wei Yang
2020-03-16 15:24 ` Michal Hocko
2020-03-16 15:34 ` David Hildenbrand [this message]
2020-03-16 15:46 ` Michal Hocko
2020-03-11 12:30 ` [PATCH v1 5/5] mm/memory_hotplug: allow to specify a default online_type David Hildenbrand
2020-03-11 14:26 ` Wei Yang
2020-03-11 15:20 ` David Hildenbrand
2020-03-11 16:55 ` Vitaly Kuznetsov
2020-03-11 17:05 ` David Hildenbrand
2020-03-16 15:31 ` Michal Hocko
2020-03-16 15:48 ` David Hildenbrand
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