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From: Vlastimil Babka <vbabka@suse.cz>
To: Michal Hocko <mhocko@suse.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Pavel Tatashin <pasha.tatashin@soleen.com>,
	David Hildenbrand <david@redhat.com>,
	Oscar Salvador <osalvador@suse.de>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>
Subject: Re: [PATCH v2 7/7] mm, page_alloc: disable pcplists during memory offline
Date: Thu, 8 Oct 2020 19:46:18 +0200	[thread overview]
Message-ID: <0a19a42c-34fe-1f52-1e6e-d82295fa5ae7@suse.cz> (raw)
In-Reply-To: <20201008124534.GD4967@dhcp22.suse.cz>

On 10/8/20 2:45 PM, Michal Hocko wrote:
> On Thu 08-10-20 13:42:01, Vlastimil Babka wrote:
>> Memory offline relies on page isolation can race with process freeing pages to
>> pcplists in a way that a page from isolated pageblock can end up on pcplist.
> 
> "Memory offlining relies on page isolation to guarantee a forward
> progress because pages cannot be reused while they are isolated. But the
> page isolation itself doesn't prevent from races while freed pages are
> stored on pcp lists and thus can be reused.
> "

Much better, thanks.



  reply	other threads:[~2020-10-08 17:46 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-08 11:41 [PATCH v2 0/7] " Vlastimil Babka
2020-10-08 11:41 ` [PATCH v2 1/7] mm, page_alloc: clean up pageset high and batch update Vlastimil Babka
2020-10-25 14:17   ` Mike Rapoport
2020-10-08 11:41 ` [PATCH v2 2/7] mm, page_alloc: calculate pageset high and batch once per zone Vlastimil Babka
2020-10-08 11:41 ` [PATCH v2 3/7] mm, page_alloc: remove setup_pageset() Vlastimil Babka
2020-10-08 12:23   ` Michal Hocko
2020-10-08 12:56     ` Vlastimil Babka
2020-10-08 13:03       ` Michal Hocko
2020-10-22 12:34   ` Oscar Salvador
2020-10-08 11:41 ` [PATCH v2 4/7] mm, page_alloc: simplify pageset_update() Vlastimil Babka
2020-10-22 12:39   ` Oscar Salvador
2020-10-08 11:41 ` [PATCH v2 5/7] mm, page_alloc: cache pageset high and batch in struct zone Vlastimil Babka
2020-10-08 12:31   ` Michal Hocko
2020-10-08 17:55     ` Vlastimil Babka
2020-10-22 12:42       ` Oscar Salvador
2020-10-08 11:42 ` [PATCH v2 6/7] mm, page_alloc: move draining pcplists to page isolation users Vlastimil Babka
2020-10-22 12:44   ` Oscar Salvador
2020-10-08 11:42 ` [PATCH v2 7/7] mm, page_alloc: disable pcplists during memory offline Vlastimil Babka
2020-10-08 12:45   ` Michal Hocko
2020-10-08 17:46     ` Vlastimil Babka [this message]
2020-10-22 12:52   ` Oscar Salvador

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