From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 502ECE94114 for ; Fri, 6 Oct 2023 20:15:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233167AbjJFUPP (ORCPT ); Fri, 6 Oct 2023 16:15:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50492 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233392AbjJFUPP (ORCPT ); Fri, 6 Oct 2023 16:15:15 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3EFEFBF for ; Fri, 6 Oct 2023 13:15:11 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7B982C433C7; Fri, 6 Oct 2023 20:15:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1696623310; bh=NjFtMC7UnOKQN9ZZ2XDg0DMje9a0z133OOSLgAc3dMY=; h=Date:To:From:Subject:From; b=LviqDF6oAZYvQDUtPSV5S/DIJkzNYX2ptER3FXPR1GIdRkQw51+j8cRoSlxudVcQX V6aigY9wXLK+RXf4KKH+WrnJhyYxRZg0TE2gP30vEsF7a4gVI0juxwFaEVtsExQRBQ jeei0LBZYC8L7F5eSgUy/QyuzrCuLYCg5JpJokFk= Date: Fri, 06 Oct 2023 13:15:08 -0700 To: mm-commits@vger.kernel.org, surenb@google.com, willy@infradead.org, akpm@linux-foundation.org From: Andrew Morton Subject: + mm-handle-read-faults-under-the-vma-lock.patch added to mm-unstable branch Message-Id: <20231006201510.7B982C433C7@smtp.kernel.org> Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The patch titled Subject: mm: handle read faults under the VMA lock has been added to the -mm mm-unstable branch. Its filename is mm-handle-read-faults-under-the-vma-lock.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-handle-read-faults-under-the-vma-lock.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: "Matthew Wilcox (Oracle)" Subject: mm: handle read faults under the VMA lock Date: Fri, 6 Oct 2023 20:53:17 +0100 Most file-backed faults are already handled through ->map_pages(), but if we need to do I/O we'll come this way. Since filemap_fault() is now safe to be called under the VMA lock, we can handle these faults under the VMA lock now. Link: https://lkml.kernel.org/r/20231006195318.4087158-6-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Cc: Suren Baghdasaryan Signed-off-by: Andrew Morton --- mm/memory.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) --- a/mm/memory.c~mm-handle-read-faults-under-the-vma-lock +++ a/mm/memory.c @@ -4620,10 +4620,9 @@ static vm_fault_t do_read_fault(struct v return ret; } - if (vmf->flags & FAULT_FLAG_VMA_LOCK) { - vma_end_read(vmf->vma); - return VM_FAULT_RETRY; - } + ret = vmf_can_call_fault(vmf); + if (ret) + return ret; ret = __do_fault(vmf); if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY))) _ Patches currently in -mm which might be from willy@infradead.org are mm-make-lock_folio_maybe_drop_mmap-vma-lock-aware.patch mm-call-wp_page_copy-under-the-vma-lock.patch mm-handle-shared-faults-under-the-vma-lock.patch mm-handle-cow-faults-under-the-vma-lock.patch mm-handle-read-faults-under-the-vma-lock.patch mm-handle-write-faults-to-ro-pages-under-the-vma-lock.patch iomap-hold-state_lock-over-call-to-ifs_set_range_uptodate.patch iomap-protect-read_bytes_pending-with-the-state_lock.patch mm-add-folio_end_read.patch ext4-use-folio_end_read.patch buffer-use-folio_end_read.patch iomap-use-folio_end_read.patch bitops-add-xor_unlock_is_negative_byte.patch alpha-implement-xor_unlock_is_negative_byte.patch m68k-implement-xor_unlock_is_negative_byte.patch mips-implement-xor_unlock_is_negative_byte.patch powerpc-implement-arch_xor_unlock_is_negative_byte-on-32-bit.patch riscv-implement-xor_unlock_is_negative_byte.patch s390-implement-arch_xor_unlock_is_negative_byte.patch mm-delete-checks-for-xor_unlock_is_negative_byte.patch mm-add-folio_xor_flags_has_waiters.patch mm-make-__end_folio_writeback-return-void.patch mm-use-folio_xor_flags_has_waiters-in-folio_end_writeback.patch