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b=U+6wmdj42j4fJfaZ4selTaZxFyi3hfSY8e0F/wddiayP8G+UrCEwR4OzOWxy0aAT6 epMr7qCVxhP7G7w3gApscqw87I6WOXG/0xBGC1ld/rX98Ysr6RoWcbzmgc0IINms4I ymEe5lWvo/4kDTQsd411jX+zROYYUH6FeJA8exy4= Date: Tue, 22 Apr 2025 17:11:16 -0700 From: Andrew Morton To: Tianyang Zhang Cc: Harry Yoo , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan Subject: Re: [PATCH] mm/page_alloc.c: Avoid infinite retries caused by cpuset race Message-Id: <20250422171116.f3928045a13205dc1b9a46ea@linux-foundation.org> In-Reply-To: <025e3f51-2ab5-bc58-5475-b57103169a82@loongson.cn> References: <20250416082405.20988-1-zhangtianyang@loongson.cn> <025e3f51-2ab5-bc58-5475-b57103169a82@loongson.cn> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 1DF42140008 X-Stat-Signature: rkskwj3kfqj6dosmnqf6hfxkhoxabhdz X-HE-Tag: 1745367077-866956 X-HE-Meta: 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 MsUt+PIL zneuj4J1/WZZlEL5VjjAtMVUyfiU3wxKFPGTtLr1pqpnAnvuCXnd7NJ0K8+0Ma7RPQv6l3UBq8JYsxEuEYu1pChvJbeHGoVpzRZ2OQIcCLKbLR7hhhhTF68VJ/FI07iy8NOIQbxMfFDfqaIprnUIlC1MwQmyYliV2x8fpnyH2/FqJqj0JgF2xbZ5NVi+tjz08pH3Fn8MdK5fVilQsZrnlAkNQ4zYHx3ooSftDHhREO8VrGEfId927A0DkKQLbgWHIswrU3iPg6fRbhSACc0VE1VBGGsAWXZf+Qu148IRW6cUpKws= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, 22 Apr 2025 20:10:06 +0800 Tianyang Zhang wrote: > > ... > > >> > >> Simultaneously starting multiple cpuset01 from LTP can quickly > >> reproduce this issue on a multi node server when the maximum > >> memory pressure is reached and the swap is enabled > >> > >> Signed-off-by: Tianyang Zhang > >> --- > > What commit does it fix and should it be backported to -stable? > > > > There's a new 'MEMORY MANAGEMENT - PAGE ALLOCATOR' entry (only in > > Andrew's mm.git repository now). > > > > Let's Cc the page allocator folks here! > > We first identified this issue in 6.6.52-stable , and through root cause > analysis, > > it appears the problem may have existed for a significant period. > > However It is recommended that the fix should be backported to at least > Linux kernel versions after 6.6-stable OK, thanks, This has been in mm-hotfixes-unstable for six days. Hopefully we'll see some review activity soon (please).