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Miller" , Jakub Kicinski , Simon Horman , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , Yunsheng Lin , Huacai Zhou Subject: Re: [RFC PATCH] mm: net: disable kswapd for high-order network buffer allocation Message-ID: References: <20251013101636.69220-1-21cnbao@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251013101636.69220-1-21cnbao@gmail.com> X-Stat-Signature: j6yog1faye6f3ahz76zqfbsdhssmw7mt X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 9CB694000D X-HE-Tag: 1760392598-160147 X-HE-Meta: U2FsdGVkX18ztRQwoq/1uDqENV/zqlWh2LfBA98VD+jT0I8GmBI7b7lj/AnoBQvtgSA0HdY9z1sFFnJb+WyOfqccaS5enmwza8wNujwVREdOM1oAvady9q76UcTA7Q/Zhwjp8hjDQmiEZ8wAGXSwtdneSb8WgVAn+H/GY718f7gpCFriieAwJzjyc4w2SJ61YOLc9ak6hYGJQyQSPCcbL76L4gtVPVhfVVMc1+JfaiNebzf0Haj8iKJll+u+irkJhSSg9Eatcm95NEzZkumpGlsNMl3+5TwY8ixo3r3n7F2EssEsmFvYxq/l3kA/S2w7xEi5pH2xCHs/8YzUsDM6bwkeQnd6u7AOm9cr8VE1oKou7Dh18MX+WYZDIMr0e5/jsLD66UOUg6VqKKPKih+lsQZB0YX5yqrxp+AyVyIAZu0F/u2noegG42eeY7zMvlKW2mjXy3joyv6arLRnMnrbMB2tNaHWwR4f3SGc9ILdJp6OAvEFoqJKVFQvor378aUly39ppF91fcL1wViXvqZW6S8Je/C8BTKRXIeJX3Yq29BxywBIhoRdU5Xa5R6Dje262nV2NocGprl05w5DrNJUacH/A5JxSJ8VDp/Ablj95ZRNZ2rJnyxFI4mQec/KJv9pVsZkZMdIOUYTkjzxjEVRvXEQNldlfULo98hUiTS68b2Lp1yHN8y5qje2DXI0vRAp6F/0Pe4nmzRimysG8fZ7XSRTahYCnEJ1M/2CPwZYaULeEntrg2i8JA4R0sb3u+KUxDmPzFeizuHiLTtjflCrr+F/ub0p/PXfH4PkJMVmuQ20rhc40HeelcsebbDzVIq+K4ccZ1iHCR1lH4Iex97L31y4F9R7VDUFawc4k4wvS4Wn4lJ+SX+ur7aOPZpq8ebiGz3lpLgdUnTTXh8LxIa2iVVEl0DnB1IwnDMhBPDmqGvHSGPaxfG0ze5EAs3Lpw2qDCq32X4O6vIxkkBdLug eJyDL5D1 mY/WUnWgC1jQhQXTrnn+hboMA30toxoqwkW8aWIhq5aBUAIewuMca60R0Sf0QqTc5HY7PySOsKmneoVCDdX+6WlOH0LIlDym1KBl5khFemrLcUQfuU0zAUmhbbIv+PgWV6vqQc+qlWHaoGuvwFgIilsaMByLGuV6hgivENCTu/Db8ewTPcOKHvTB/iQ== 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, Oct 13, 2025 at 06:16:36PM +0800, Barry Song wrote: > On phones, we have observed significant phone heating when running apps > with high network bandwidth. This is caused by the network stack frequently > waking kswapd for order-3 allocations. As a result, memory reclamation becomes > constantly active, even though plenty of memory is still available for network > allocations which can fall back to order-0. I think we need to understand what's going on here a whole lot more than this! So, we try to do an order-3 allocation. kswapd runs and ... succeeds in creating order-3 pages? Or fails to? If it fails, that's something we need to sort out. If it succeeds, now we have several order-3 pages, great. But where do they all go that we need to run kswapd again?