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[109.81.16.57]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-46fb55ac08dsm217399135e9.13.2025.10.14.00.26.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Oct 2025 00:26:50 -0700 (PDT) Date: Tue, 14 Oct 2025 09:26:49 +0200 From: Michal Hocko To: Vlastimil Babka Cc: Barry Song <21cnbao@gmail.com>, netdev@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Barry Song , Jonathan Corbet , Eric Dumazet , Kuniyuki Iwashima , Paolo Abeni , Willem de Bruijn , "David S. Miller" , Jakub Kicinski , Simon Horman , Suren Baghdasaryan , Brendan Jackman , Johannes Weiner , Zi Yan , Yunsheng Lin , Huacai Zhou , Alexei Starovoitov , Harry Yoo , David Hildenbrand , Matthew Wilcox , Roman Gushchin Subject: Re: [RFC PATCH] mm: net: disable kswapd for high-order network buffer allocation Message-ID: References: <20251013101636.69220-1-21cnbao@gmail.com> <927bcdf7-1283-4ddd-bd5e-d2e399b26f7d@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <927bcdf7-1283-4ddd-bd5e-d2e399b26f7d@suse.cz> X-Rspam-User: X-Stat-Signature: pcrje38yib6hmkt3bbs3hgxg975bcyo1 X-Rspamd-Queue-Id: 01BD41C0002 X-Rspamd-Server: rspam09 X-HE-Tag: 1760426811-210754 X-HE-Meta: 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 3adyNCr8 Zs1va9OQW84yivE6OUusGXzhZTtECAvDPtTnj42ZMc+EwRCBgsUmgi4hjaWGtGU+5ITzwFEFzoo9e2ARAltDOmLqxH+mbCdURepeIIWm7LzeGrpbm3mkWl5KSHCvg7bhFNPxzO1r8ksvTzNkKJM5IKqvSIsh7oZa4c5VE4ESVZ47sVwa7RFCVPlDo1MXifvePFXFo1cW/xhtksp9UqNkjDqsS+2HKx39Nqg93z2AzqkA85sCQtyrxUOT2S0adcWNh4XrpDEcJCaExRhUFWIq8DxsWqvPFFRJ9sh94acvzKUPJ1WJgRa4YessD5yv8EE53S6H22V7ZKMR5JmyCdXK6xsawbYP8pBb+7eV41KhJWGeTUypLJwLXHhvIwCwafzojGboz+9ZeyJMdr4wOeoCQvdl6qZO4sDNJEOFu 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 Mon 13-10-25 20:30:13, Vlastimil Babka wrote: > On 10/13/25 12:16, Barry Song wrote: > > From: Barry Song [...] > I wonder if we should either: > > 1) sacrifice a new __GFP flag specifically for "!allow_spin" case to > determine it precisely. As said in other reply I do not think this is a good fit for this specific case as it is all or nothing approach. Soon enough we discover that "no effort to reclaim/compact" hurts other usecases. So I do not think we need a dedicated flag for this specific case. We need a way to tell kswapd/kcompactd how much to try instead. -- Michal Hocko SUSE Labs