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Sun, 08 Jun 2025 00:36:13 -0700 (PDT) From: Yafang Shao To: 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, usamaarif642@gmail.com, gutierrez.asier@huawei-partners.com, willy@infradead.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org Cc: bpf@vger.kernel.org, linux-mm@kvack.org, Yafang Shao Subject: [RFC PATCH v3 3/5] mm, thp: add bpf thp hook to determine thp reclaimer Date: Sun, 8 Jun 2025 15:35:14 +0800 Message-Id: <20250608073516.22415-4-laoar.shao@gmail.com> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) In-Reply-To: <20250608073516.22415-1-laoar.shao@gmail.com> References: <20250608073516.22415-1-laoar.shao@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 4646C14000F X-Stat-Signature: u6aacxfj87dwhi153h319aran19apzz4 X-Rspam-User: X-HE-Tag: 1749368175-486371 X-HE-Meta: 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 36tsMgWx 7Dv05FUZG4ZQyC5S7+AGOxJ9His5nQVUGTKlOvjPwzYW9T3U4CarWVsE9b1pZvpcnqQb2vhHiTg11mTUyBgyM6ST3wnZfUUEng71e75TwhUphnlSCcb3ksvnKS9TbLY6MnD/3DWdmoxZSbr51m3krP+RpJ/3nvjB52+GA8O9HjzfP4I3g8reVPi0F/Yvr9mgOcaLdmwBEp8hmDgA7lrM58RX6OO6BQG1AQb6mWsvU1kD6NiAXTUgTDBSc+/QdWM0r3dyyMEdgvXP9aAuBZcIn+EE+z+yNqXuK1T4ZhdaUVdWcoVuYn5wtPwokHruEDstIbBld0I0rtCSawx5Og3YH0Y/LifpB/XCzFhQ9Vzy6AERs4VSnha1fBTlrf8FL2wFNmZhsksCzKcRPcihkrIwoyZwZHLDVwQIuyo5iB8liBBlGSwqqCVr6w5iRAWXNFL5gCC9YxmE+uavEL48niE32Cafgo5i87fBCF9Dl 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: A new hook, bpf_thp_gfp_mask(), is introduced to determine whether memory reclamation is being performed by the current task or by kswapd. Signed-off-by: Yafang Shao --- include/linux/huge_mm.h | 5 +++++ mm/huge_memory.c | 5 +++++ 2 files changed, 10 insertions(+) diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index db2eadd3f65b..6a40ebf25f5c 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -198,6 +198,11 @@ static inline int bpf_thp_allocator(unsigned long vm_flags, return THP_ALLOC_KHUGEPAGED | THP_ALLOC_CURRENT; } +static inline gfp_t bpf_thp_gfp_mask(bool vma_madvised) +{ + return 0; +} + static inline int highest_order(unsigned long orders) { return fls_long(orders) - 1; diff --git a/mm/huge_memory.c b/mm/huge_memory.c index d3e66136e41a..81c1711d13fa 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1280,6 +1280,11 @@ static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf) gfp_t vma_thp_gfp_mask(struct vm_area_struct *vma) { const bool vma_madvised = vma && (vma->vm_flags & VM_HUGEPAGE); + gfp_t gfp_mask; + + gfp_mask = bpf_thp_gfp_mask(vma_madvised); + if (gfp_mask) + return gfp_mask; /* Always do synchronous compaction */ if (test_bit(TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, &transparent_hugepage_flags)) -- 2.43.5