From: David Hildenbrand <david@redhat.com>
To: Miaohe Lin <linmiaohe@huawei.com>, akpm@linux-foundation.org
Cc: naoya.horiguchi@nec.com, mhocko@suse.com, minchan@kernel.org,
cgoldswo@codeaurora.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/3] mm/memory_hotplug: fix potential permanent lru cache disable
Date: Mon, 23 Aug 2021 14:15:07 +0200 [thread overview]
Message-ID: <985b591a-ef1f-cbbe-c627-a17240dc7bb6@redhat.com> (raw)
In-Reply-To: <20210821094246.10149-3-linmiaohe@huawei.com>
On 21.08.21 11:42, Miaohe Lin wrote:
> If offline_pages failed after lru_cache_disable(), it forgot to do
> lru_cache_enable() in error path. So we would have lru cache disabled
> permanently in this case.
>
> Fixes: d479960e44f2 ("mm: disable LRU pagevec during the migration temporarily")
> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
> ---
> mm/memory_hotplug.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index d986d3791986..9fd0be32a281 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -2033,6 +2033,7 @@ int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages,
> undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE);
> memory_notify(MEM_CANCEL_OFFLINE, &arg);
> failed_removal_pcplists_disabled:
> + lru_cache_enable();
> zone_pcp_enable(zone);
> failed_removal:
> pr_debug("memory offlining [mem %#010llx-%#010llx] failed due to %s\n",
>
Reviewed-by: David Hildenbrand <david@redhat.com>
As mentioned, this should be backported to stable.
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2021-08-23 12:15 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-21 9:42 [PATCH 0/3] Cleanup and fixups for memory hotplug Miaohe Lin
2021-08-21 9:42 ` [PATCH 1/3] mm/memory_hotplug: use helper zone_is_zone_device() to simplify the code Miaohe Lin
2021-08-23 8:20 ` HORIGUCHI NAOYA(堀口 直也)
2021-08-23 9:11 ` Oscar Salvador
2021-08-23 12:14 ` David Hildenbrand
2021-08-21 9:42 ` [PATCH 2/3] mm/memory_hotplug: fix potential permanent lru cache disable Miaohe Lin
2021-08-23 8:21 ` HORIGUCHI NAOYA(堀口 直也)
2021-08-23 9:15 ` Oscar Salvador
2021-08-23 11:13 ` Miaohe Lin
2021-08-23 12:15 ` David Hildenbrand [this message]
2021-08-21 9:42 ` [PATCH 3/3] mm/memory_hotplug: make HWPoisoned dirty swapcache pages unmovable Miaohe Lin
2021-08-23 8:26 ` HORIGUCHI NAOYA(堀口 直也)
2021-08-23 9:14 ` Miaohe Lin
2021-11-04 22:07 ` Andrew Morton
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