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Sun, 08 Jun 2025 00:36:14 -0700 (PDT) Received: from localhost.localdomain ([39.144.124.91]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-236035069c3sm35968135ad.234.2025.06.08.00.36.05 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); 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> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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