From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DA56780BF7 for ; Fri, 26 Apr 2024 04:02:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714104147; cv=none; b=b9DufJ91bNhPibbHqZjlwgZ+ARs9eKvKahNMTUA51ZnhcnFu5JbpdfY88tmTmDbkDn5B7aPN2Mb5dIxR8sEN5PMxnaxKjwsYuhjiZDPNqung2EBIvwQKCKqXynq2ZrVoLT6X7+X6k8FsFr1bEbbqL/OomMq2oAoljHs1lFqNeU8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714104147; c=relaxed/simple; bh=kLTzrlYjljz/gn94mlgYN0tggWycAnBnSjG42PldONQ=; h=Date:To:From:Subject:Message-Id; b=Qmy182M0SbGntv14tut7gbXmVed0nFTVjL7WbyfFfo9a1lOtfCTEy15LDJPixupe6vh1i6/ZZ16w62DZKE/ai5cyoVnwZksn8KslgwkdrQoMNstsccVWyyka9NZRGw3MDeZPVQ1c5epCvDo0qPVAmFvFFfzSHONodhCTBdujFF0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=rkhydvBB; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="rkhydvBB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A54B7C113CD; Fri, 26 Apr 2024 04:02:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1714104147; bh=kLTzrlYjljz/gn94mlgYN0tggWycAnBnSjG42PldONQ=; h=Date:To:From:Subject:From; b=rkhydvBBz+tw6gZDQdKQqiLXbuWtRAu3K0VNZY6QSDV2uN20gwxuOiytZ52z3c2dk //qnrr3RwJiUlrqXRUMMvIUOZLk9bxlBHlTkzdE5Q40oswjdcCh/7hlRucpy3m/M9B 9hnQzpTSHHPRqlEPCDEw2o3+HM3KKOFJNuZIhrjk= Date: Thu, 25 Apr 2024 21:02:27 -0700 To: mm-commits@vger.kernel.org,will@kernel.org,surenb@google.com,peterz@infradead.org,paul.walmsley@sifive.com,palmer@dabbelt.com,npiggin@gmail.com,mpe@ellerman.id.au,luto@kernel.org,linux@armlinux.org.uk,gerald.schaefer@linux.ibm.com,dave.hansen@linux.intel.com,christophe.leroy@csgroup.eu,catalin.marinas@arm.com,aou@eecs.berkeley.edu,agordeev@linux.ibm.com,wangkefeng.wang@huawei.com,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] arm64-mm-accelerate-pagefault-when-vm_fault_badaccess.patch removed from -mm tree Message-Id: <20240426040227.A54B7C113CD@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: arm64: mm: accelerate pagefault when VM_FAULT_BADACCESS has been removed from the -mm tree. Its filename was arm64-mm-accelerate-pagefault-when-vm_fault_badaccess.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Kefeng Wang Subject: arm64: mm: accelerate pagefault when VM_FAULT_BADACCESS Date: Wed, 3 Apr 2024 16:38:00 +0800 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, the latency time reduces 34% in 'lat_sig -P 1 prot lat_sig' from lmbench testcase. Since the page fault is handled under per-VMA lock, count it as a vma lock event with VMA_LOCK_SUCCESS. Link: https://lkml.kernel.org/r/20240403083805.1818160-3-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang Reviewed-by: Suren Baghdasaryan Reviewed-by: Catalin Marinas Cc: Albert Ou Cc: Alexander Gordeev Cc: Andy Lutomirski Cc: Christophe Leroy Cc: Dave Hansen Cc: Gerald Schaefer Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Russell King Cc: Will Deacon Signed-off-by: Andrew Morton --- arch/arm64/mm/fault.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/arch/arm64/mm/fault.c~arm64-mm-accelerate-pagefault-when-vm_fault_badaccess +++ a/arch/arm64/mm/fault.c @@ -572,7 +572,9 @@ static int __kprobes do_page_fault(unsig if (!(vma->vm_flags & vm_flags)) { vma_end_read(vma); - goto lock_mmap; + fault = VM_FAULT_BADACCESS; + count_vm_vma_lock_event(VMA_LOCK_SUCCESS); + goto done; } fault = handle_mm_fault(vma, addr, mm_flags | FAULT_FLAG_VMA_LOCK, regs); if (!(fault & (VM_FAULT_RETRY | VM_FAULT_COMPLETED))) _ Patches currently in -mm which might be from wangkefeng.wang@huawei.com are arm64-mm-drop-vm_fault_badmap-vm_fault_badaccess.patch arm-mm-drop-vm_fault_badmap-vm_fault_badaccess.patch mm-move-mm-counter-updating-out-of-set_pte_range.patch mm-filemap-batch-mm-counter-updating-in-filemap_map_pages.patch mm-swapfile-check-usable-swap-device-in-__folio_throttle_swaprate.patch mm-memory-check-userfaultfd_wp-in-vmf_orig_pte_uffd_wp.patch