From: Michal Hocko <mhocko@suse.com>
To: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
linux-mm@kvack.org
Subject: Re: [PATCH] mm/memory_hotplug: drain per-cpu pages again during memory offline
Date: Thu, 3 Sep 2020 09:07:33 +0200 [thread overview]
Message-ID: <20200903070733.GO4617@dhcp22.suse.cz> (raw)
In-Reply-To: <20200901124615.137200-1-pasha.tatashin@soleen.com>
On Tue 01-09-20 08:46:15, Pavel Tatashin wrote:
[...]
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index e9d5ab5d3ca0..d6d54922bfce 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -1575,6 +1575,15 @@ static int __ref __offline_pages(unsigned long start_pfn,
> /* check again */
> ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn,
> NULL, check_pages_isolated_cb);
> + /*
> + * per-cpu pages are drained in start_isolate_page_range, but if
> + * there are still pages that are not free, make sure that we
> + * drain again, because when we isolated range we might
> + * have raced with another thread that was adding pages to
> + * pcp list.
I would also add
* Forward progress should be still guaranteed because
* pages on the pcp list can only belong to MOVABLE_ZONE
* because has_unmovable_pages explicitly checks for
* PageBuddy on freed pages on other zones.
> + */
> + if (ret)
> + drain_all_pages(zone);
> } while (ret);
>
> /* Ok, all of our target is isolated.
> --
> 2.25.1
>
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2020-09-03 7:07 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-01 12:46 [PATCH] mm/memory_hotplug: drain per-cpu pages again during memory offline Pavel Tatashin
2020-09-01 18:37 ` David Rientjes
2020-09-02 14:01 ` Michal Hocko
2020-09-02 14:10 ` Michal Hocko
2020-09-02 14:31 ` Pavel Tatashin
2020-09-02 14:49 ` Vlastimil Babka
2020-09-02 14:08 ` Michal Hocko
2020-09-02 14:26 ` Pavel Tatashin
2020-09-02 14:55 ` Vlastimil Babka
2020-09-02 15:13 ` Michal Hocko
2020-09-02 15:40 ` Pavel Tatashin
2020-09-02 17:51 ` Vlastimil Babka
2020-09-03 6:38 ` Michal Hocko
2020-09-03 18:20 ` David Hildenbrand
2020-09-03 18:23 ` Pavel Tatashin
2020-09-03 18:31 ` David Hildenbrand
2020-09-04 7:02 ` Michal Hocko
2020-09-04 14:25 ` Pavel Tatashin
2020-09-07 7:26 ` Michal Hocko
2020-09-04 6:32 ` Vlastimil Babka
2020-09-03 7:07 ` Michal Hocko [this message]
2020-09-03 13:43 ` Pavel Tatashin
2020-09-03 13:50 ` Vlastimil Babka
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