From: Baoquan He <bhe@redhat.com>
To: David Hildenbrand <david@redhat.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linuxppc-dev@lists.ozlabs.org, linux-hyperv@vger.kernel.org,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Yumei Huang <yuhuang@redhat.com>,
Igor Mammedov <imammedo@redhat.com>,
Eduardo Habkost <ehabkost@redhat.com>,
Milan Zamazal <mzamazal@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Haiyang Zhang <haiyangz@microsoft.com>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Michal Hocko <mhocko@kernel.org>, Michal Hocko <mhocko@suse.com>,
Oscar Salvador <osalvador@suse.de>,
Paul Mackerras <paulus@samba.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
Stephen Hemminger <sthemmin@microsoft.com>,
Wei Liu <wei.liu@kernel.org>,
Wei Yang <richard.weiyang@gmail.com>
Subject: Re: [PATCH v3 0/8] mm/memory_hotplug: allow to specify a default online_type
Date: Fri, 20 Mar 2020 18:01:27 +0800 [thread overview]
Message-ID: <20200320100127.GG2987@MiWiFi-R3L-srv> (raw)
In-Reply-To: <20200319131221.14044-1-david@redhat.com>
On 03/19/20 at 02:12pm, David Hildenbrand wrote:
> Distributions nowadays use udev rules ([1] [2]) to specify if and
> how to online hotplugged memory. The rules seem to get more complex with
> many special cases. Due to the various special cases,
> CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE cannot be used. All memory hotplug
> is handled via udev rules.
>
> Everytime we hotplug memory, the udev rule will come to the same
> conclusion. Especially Hyper-V (but also soon virtio-mem) add a lot of
> memory in separate memory blocks and wait for memory to get onlined by user
> space before continuing to add more memory blocks (to not add memory faster
> than it is getting onlined). This of course slows down the whole memory
> hotplug process.
>
> To make the job of distributions easier and to avoid udev rules that get
> more and more complicated, let's extend the mechanism provided by
> - /sys/devices/system/memory/auto_online_blocks
> - "memhp_default_state=" on the kernel cmdline
> to be able to specify also "online_movable" as well as "online_kernel"
>
> v2 -> v3:
> - "hv_balloon: don't check for memhp_auto_online manually"
> -- init_completion() before register_memory_notifier()
> - Minor typo fix
>
> v1 -> v2:
> - Tweaked some patch descriptions
> - Added
> -- "powernv/memtrace: always online added memory blocks"
> -- "hv_balloon: don't check for memhp_auto_online manually"
> -- "mm/memory_hotplug: unexport memhp_auto_online"
> - "mm/memory_hotplug: convert memhp_auto_online to store an online_type"
> -- No longer touches hv/memtrace code
Ack the series.
Reviewed-by: Baoquan He <bhe@redhat.com>
prev parent reply other threads:[~2020-03-20 10:01 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-19 13:12 [PATCH v3 0/8] mm/memory_hotplug: allow to specify a default online_type David Hildenbrand
2020-03-19 13:12 ` [PATCH v3 1/8] drivers/base/memory: rename MMOP_ONLINE_KEEP to MMOP_ONLINE David Hildenbrand
2020-03-19 16:28 ` Pankaj Gupta
2020-03-19 13:12 ` [PATCH v3 2/8] drivers/base/memory: map MMOP_OFFLINE to 0 David Hildenbrand
2020-03-19 16:29 ` Pankaj Gupta
2020-03-19 13:12 ` [PATCH v3 3/8] drivers/base/memory: store mapping between MMOP_* and string in an array David Hildenbrand
2020-03-19 16:33 ` Pankaj Gupta
2020-03-20 7:36 ` Baoquan He
2020-03-20 9:50 ` David Hildenbrand
2020-03-20 9:59 ` Baoquan He
2020-03-19 13:12 ` [PATCH v3 4/8] powernv/memtrace: always online added memory blocks David Hildenbrand
2020-03-19 13:12 ` [PATCH v3 5/8] hv_balloon: don't check for memhp_auto_online manually David Hildenbrand
2020-03-19 13:12 ` [PATCH v3 6/8] mm/memory_hotplug: unexport memhp_auto_online David Hildenbrand
2020-03-19 16:52 ` Pankaj Gupta
2020-03-19 13:12 ` [PATCH v3 7/8] mm/memory_hotplug: convert memhp_auto_online to store an online_type David Hildenbrand
2020-03-19 17:19 ` Pankaj Gupta
2020-03-19 13:12 ` [PATCH v3 8/8] mm/memory_hotplug: allow to specify a default online_type David Hildenbrand
2020-03-19 17:26 ` Pankaj Gupta
2020-03-20 10:01 ` Baoquan He [this message]
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