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Wed, 3 Apr 2024 16:38:25 +0800 (CST) Received: from localhost.localdomain (10.175.112.125) by dggpemm100001.china.huawei.com (7.185.36.93) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.35; Wed, 3 Apr 2024 16:38:24 +0800 From: Kefeng Wang To: CC: Russell King , Catalin Marinas , Will Deacon , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexander Gordeev , Gerald Schaefer , Dave Hansen , Andy Lutomirski , Peter Zijlstra , , , , , , , , Kefeng Wang Subject: [PATCH v2 3/7] arm: mm: accelerate pagefault when VM_FAULT_BADACCESS Date: Wed, 3 Apr 2024 16:38:01 +0800 Message-ID: <20240403083805.1818160-4-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20240403083805.1818160-1-wangkefeng.wang@huawei.com> References: <20240403083805.1818160-1-wangkefeng.wang@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To dggpemm100001.china.huawei.com (7.185.36.93) X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: DE4A92000E X-Stat-Signature: 9c6crxzebb6tqp8han4ti8wfyean1n3d X-Rspam-User: X-HE-Tag: 1712133508-581165 X-HE-Meta: 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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: The vm_flags of vma already checked under per-VMA lock, if it is a bad access, directly set fault to VM_FAULT_BADACCESS and handle error, no need to retry with mmap_lock again. Since the page faut is handled under per-VMA lock, count it as a vma lock event with VMA_LOCK_SUCCESS. Reviewed-by: Suren Baghdasaryan Signed-off-by: Kefeng Wang --- arch/arm/mm/fault.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c index 439dc6a26bb9..5c4b417e24f9 100644 --- a/arch/arm/mm/fault.c +++ b/arch/arm/mm/fault.c @@ -294,7 +294,9 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) if (!(vma->vm_flags & vm_flags)) { vma_end_read(vma); - goto lock_mmap; + count_vm_vma_lock_event(VMA_LOCK_SUCCESS); + fault = VM_FAULT_BADACCESS; + goto bad_area; } fault = handle_mm_fault(vma, addr, flags | FAULT_FLAG_VMA_LOCK, regs); if (!(fault & (VM_FAULT_RETRY | VM_FAULT_COMPLETED)))