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[73.170.51.167]) by smtp.googlemail.com with ESMTPSA id x16-20020aa784d0000000b006e13a5ab1e5sm5317803pfn.73.2024.02.20.15.17.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Feb 2024 15:17:54 -0800 (PST) From: "Vishal Moola (Oracle)" To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, akpm@linux-foundation.org, muchun.song@linux.dev, "Vishal Moola (Oracle)" Subject: [PATCH 0/3] Handle hugetlb faults under the VMA lock Date: Tue, 20 Feb 2024 15:14:21 -0800 Message-ID: <20240220231424.126600-1-vishal.moola@gmail.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: A19D1100003 X-Rspam-User: X-Stat-Signature: 5c5d6cdemhxizkzdrtddm3jxoisax4kh X-Rspamd-Server: rspam01 X-HE-Tag: 1708471076-665415 X-HE-Meta: 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 E8hdOchv cjxrWJJSndYMkdSdEgcpzM0Zl3yGShx9Z2/HCa5qMJvqwk3Q8VED7kHvAyGCSZ4PxtPjMvPcJRKzf2MmqrkT+uNKH9VNpIjj7ETwnpkLj10kDsr95OguKTSX2WjC44EROYzCRX9pZi92Kin6FREA9IxordXdMF+h6D1bLa3NW1+Q3r11K1hWUnXIWj46hig77Md8FnBbphXVYyOtQKtZQ6GdyDg== 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: It is generally safe to handle hugetlb faults under the VMA lock. The only time this is unsafe is when no anon_vma has been allocated to this vma yet, so we can use vmf_anon_prepare() instead of anon_vma_prepare() to bailout if necessary. This may only happen for the first non-shared hugetlb page in the vma. ----- The last patch in this series may cause ltp hugemmap10 to "fail". This is expected behavior - see the commit message for patch 3 in this series. The rest of the ltp hugetlb tests pass. This patchset applies cleanly ontop of mm-unstable. Vishal Moola (Oracle) (3): mm/memory: Change vmf_anon_prepare() to be non-static hugetlb: Use vmf_anon_prepare() instead of anon_vma_prepare() hugetlb: Allow faults to be handled under the VMA lock include/linux/hugetlb.h | 1 + mm/hugetlb.c | 33 +++++++++++++++++++++------------ mm/memory.c | 2 +- 3 files changed, 23 insertions(+), 13 deletions(-) -- 2.43.0