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 46BB2372675 for ; Mon, 23 Mar 2026 21:09:59 +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=1774300199; cv=none; b=uhJBuhJ/VQpl+o9Byf3gDOkTfrNM0O0GYc1l/S3uKPz5wxg7xH4upk8b1CagAJcngKTcfOj/pxeTl+FijFfsV2nX9JBEIRKaxwtlsrAlCZTUHi3kDSgMHxY7C1c3rilGZaUdt6JFIotl8VK81LfNwHxtsbia55oXNWVMFC+viCo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774300199; c=relaxed/simple; bh=/MQvYHMyLGXecUO3eB/CWvLjkqL7/Aw50XyxL5zh3pQ=; h=Date:To:From:Subject:Message-Id; b=HxH/ritaQOv/85OXGiD+2LH2nDQAlN46OSYMH69Jwov0rplmUEJE3SLpPvgeQZysvC9mEILFqxSVwxefxLPSVJAGzPiQETnu25x2gba3esEqdoqen1unjP5dhbc0R8aJAq5Un2MPYM4Jy2l63jP7rP/f9RnakBzhNVGIjpDKCQQ= 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=1Sx4nSYe; 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="1Sx4nSYe" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1CE86C4CEF7; Mon, 23 Mar 2026 21:09:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1774300199; bh=/MQvYHMyLGXecUO3eB/CWvLjkqL7/Aw50XyxL5zh3pQ=; h=Date:To:From:Subject:From; b=1Sx4nSYeL196fD1h4EoPtmkFCHU6QKH6i39EUBOc0uwfjG5r6rMc94pKsipbECXQt iaZ50Mez/Y1c2xLw09f/FAETp/HyA4pwIc6XkL8Fdm6BvyWOxL6RfUK1yp21hxcjAu BcRnQRJATWuBDxEGZZqcAuCjvVGnJfWFQnDKOM64= Date: Mon, 23 Mar 2026 14:09:58 -0700 To: mm-commits@vger.kernel.org,rppt@kernel.org,pratyush@kernel.org,pasha.tatashin@soleen.com,jianghaoran@kylinos.cn,duanchenghao@kylinos.cn,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-memfd_luo-optimize-shmem_recalc_inode-calls-in-retrieve-path.patch added to mm-new branch Message-Id: <20260323210959.1CE86C4CEF7@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm/memfd_luo: optimize shmem_recalc_inode calls in retrieve path has been added to the -mm mm-new branch. Its filename is mm-memfd_luo-optimize-shmem_recalc_inode-calls-in-retrieve-path.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memfd_luo-optimize-shmem_recalc_inode-calls-in-retrieve-path.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is included in linux-next 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 various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Chenghao Duan Subject: mm/memfd_luo: optimize shmem_recalc_inode calls in retrieve path Date: Mon, 23 Mar 2026 19:07:45 +0800 Move shmem_recalc_inode() out of the loop in memfd_luo_retrieve_folios() to improve performance when restoring large memfds. Currently, shmem_recalc_inode() is called for each folio during restore, which is O(n) expensive operations. This patch collects the number of successfully added folios and calls shmem_recalc_inode() once after the loop completes, reducing complexity to O(1). Additionally, fix the error path to also call shmem_recalc_inode() for the folios that were successfully added before the error occurred. Link: https://lkml.kernel.org/r/20260323110747.193569-3-duanchenghao@kylinos.cn Signed-off-by: Chenghao Duan Reviewed-by: Pasha Tatashin Cc: Haoran Jiang Cc: Mike Rapoport (Microsoft) Cc: Pratyush Yadav Signed-off-by: Andrew Morton --- mm/memfd_luo.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/mm/memfd_luo.c~mm-memfd_luo-optimize-shmem_recalc_inode-calls-in-retrieve-path +++ a/mm/memfd_luo.c @@ -410,7 +410,7 @@ static int memfd_luo_retrieve_folios(str struct inode *inode = file_inode(file); struct address_space *mapping = inode->i_mapping; struct folio *folio; - long npages; + long npages, nr_added_pages = 0; int err = -EIO; long i; @@ -465,12 +465,14 @@ static int memfd_luo_retrieve_folios(str goto unlock_folio; } - shmem_recalc_inode(inode, npages, 0); + nr_added_pages += npages; folio_add_lru(folio); folio_unlock(folio); folio_put(folio); } + shmem_recalc_inode(inode, nr_added_pages, 0); + return 0; unlock_folio: @@ -489,6 +491,8 @@ put_folios: folio_put(folio); } + shmem_recalc_inode(inode, nr_added_pages, 0); + return err; } _ Patches currently in -mm which might be from duanchenghao@kylinos.cn are mm-memfd-use-folio_nr_pages-for-shmem-inode-accounting.patch mm-memfd_luo-optimize-shmem_recalc_inode-calls-in-retrieve-path.patch mm-memfd_luo-remove-unnecessary-memset-in-zero-size-memfd-path.patch mm-memfd_luo-use-i_size_write-to-set-inode-size-during-retrieve.patch