From: "Michael S. Tsirkin" <mst@redhat.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: "David Hildenbrand (Arm)" <david@kernel.org>,
linux-kernel@vger.kernel.org, Miaohe Lin <linmiaohe@huawei.com>,
Naoya Horiguchi <nao.horiguchi@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Oscar Salvador <osalvador@suse.de>,
Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>,
Rik van Riel <riel@redhat.com>,
Vlastimil Babka <vbabka@kernel.org>,
Lorenzo Stoakes <ljs@kernel.org>,
"Liam R. Howlett" <liam@infradead.org>,
Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>,
Brendan Jackman <jackmanb@google.com>,
Johannes Weiner <hannes@cmpxchg.org>, Zi Yan <ziy@nvidia.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Nico Pache <npache@redhat.com>,
Ryan Roberts <ryan.roberts@arm.com>, Dev Jain <dev.jain@arm.com>,
Barry Song <baohua@kernel.org>, Lance Yang <lance.yang@linux.dev>,
Christoph Lameter <cl@gentwo.org>,
David Rientjes <rientjes@google.com>,
Roman Gushchin <roman.gushchin@linux.dev>,
Harry Yoo <harry@kernel.org>, Hao Li <hao.li@linux.dev>,
Kiryl Shutsemau <kas@kernel.org>,
Byungchul Park <byungchul@sk.com>,
linux-mm@kvack.org, linux-cxl@vger.kernel.org
Subject: Re: [PATCH 0/2] mm: memory-failure: fix HWPoison flag race with non-atomic page flag ops
Date: Mon, 29 Jun 2026 17:17:55 -0400 [thread overview]
Message-ID: <20260629171727-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <akLb3WW1nJBaIBwc@firstfloor.org>
On Mon, Jun 29, 2026 at 01:55:57PM -0700, Andi Kleen wrote:
> > > Or if there are actually more performant alternatives that we could use. (I
> > > still doubt that using atomics is ok in general)
> >
> > Right now I'm thinking of looking at something like stop_machine maybe.
>
> There can be (rare) cases where yoy get a lot of memory errors in a
> flood. While memory-failure doesn't need to be particularly optimized,
> it shouldn't be excessively slow or impact the rest of the machine.
>
> stop_machine is a big hammer that is likely to violate most of this.
>
> -Andi
We can maybe batch a bunch of these, and do stop machine once?
--
MST
next prev parent reply other threads:[~2026-06-29 21:18 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-28 21:45 [PATCH 0/2] mm: memory-failure: fix HWPoison flag race with non-atomic page flag ops Michael S. Tsirkin
2026-06-28 21:45 ` [PATCH 1/2] mm: memory-failure: use RCU to fix HWPoison flag race Michael S. Tsirkin
2026-06-28 21:45 ` [PATCH 2/2] mm: wrap non-atomic page flag ops in RCU for HWPoison safety Michael S. Tsirkin
2026-06-29 2:11 ` [PATCH 0/2] mm: memory-failure: fix HWPoison flag race with non-atomic page flag ops Andi Kleen
2026-06-29 8:10 ` Michael S. Tsirkin
2026-06-29 8:21 ` David Hildenbrand (Arm)
2026-06-29 8:39 ` Michael S. Tsirkin
2026-06-29 16:54 ` Andi Kleen
2026-06-29 17:04 ` David Hildenbrand (Arm)
2026-06-29 20:43 ` Michael S. Tsirkin
2026-06-29 6:49 ` David Hildenbrand (Arm)
2026-06-29 7:34 ` Michael S. Tsirkin
2026-06-29 13:05 ` David Hildenbrand (Arm)
2026-06-29 20:08 ` Michael S. Tsirkin
2026-06-29 20:55 ` Andi Kleen
2026-06-29 21:17 ` Michael S. Tsirkin [this message]
2026-06-29 21:39 ` Andi Kleen
2026-06-29 21:59 ` Michael S. Tsirkin
2026-06-29 21:22 ` David Hildenbrand (Arm)
2026-06-29 21:43 ` David Hildenbrand (Arm)
2026-06-29 23:34 ` Michael S. Tsirkin
2026-06-30 6:17 ` David Hildenbrand (Arm)
2026-06-30 6:27 ` Michael S. Tsirkin
2026-06-30 6:34 ` David Hildenbrand (Arm)
2026-06-30 7:25 ` Michael S. Tsirkin
2026-06-29 21:50 ` Michael S. Tsirkin
2026-06-30 6:30 ` David Hildenbrand (Arm)
2026-06-30 6:41 ` David Hildenbrand (Arm)
2026-06-29 21:54 ` Michael S. Tsirkin
2026-06-29 23:29 ` Michael S. Tsirkin
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