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([2a02:6b6f:e750:1b00:1cfc:9209:4810:3ae5]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-46e2ab6a514sm120108055e9.22.2025.09.26.08.19.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 26 Sep 2025 08:19:42 -0700 (PDT) Message-ID: <37ec3e8b-e46d-40d4-826d-b4b2378015cb@gmail.com> Date: Fri, 26 Sep 2025 16:19:41 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 mm-new 05/12] mm: thp: decouple THP allocation between swap and page fault paths Content-Language: en-GB To: Yafang Shao , akpm@linux-foundation.org, david@redhat.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, hannes@cmpxchg.org, gutierrez.asier@huawei-partners.com, willy@infradead.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, ameryhung@gmail.com, rientjes@google.com, corbet@lwn.net, 21cnbao@gmail.com, shakeel.butt@linux.dev, tj@kernel.org, lance.yang@linux.dev Cc: bpf@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250926093343.1000-1-laoar.shao@gmail.com> <20250926093343.1000-6-laoar.shao@gmail.com> From: Usama Arif In-Reply-To: <20250926093343.1000-6-laoar.shao@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Stat-Signature: 46mewbnomjwxbboqa48gnbqcwi6cu8s7 X-Rspam-User: X-Rspamd-Queue-Id: 4CEAFC000E X-Rspamd-Server: rspam04 X-HE-Tag: 1758899985-360447 X-HE-Meta: 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 ixcu/kwz 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 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 26/09/2025 10:33, Yafang Shao wrote: > The new BPF capability enables finer-grained THP policy decisions by > introducing separate handling for swap faults versus normal page faults. > > As highlighted by Barry: > > We’ve observed that swapping in large folios can lead to more > swap thrashing for some workloads- e.g. kernel build. Consequently, > some workloads might prefer swapping in smaller folios than those > allocated by alloc_anon_folio(). > > While prtcl() could potentially be extended to leverage this new policy, > doing so would require modifications to the uAPI. > > Signed-off-by: Yafang Shao > Reviewed-by: Lorenzo Stoakes > Cc: Barry Song <21cnbao@gmail.com> > --- > include/linux/huge_mm.h | 3 ++- > mm/huge_memory.c | 2 +- > mm/memory.c | 2 +- > 3 files changed, 4 insertions(+), 3 deletions(-) > Acked-by: Usama Arif