From nobody Fri Apr 3 20:55:23 2026 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (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 A2EAA3976B7 for ; Mon, 23 Mar 2026 11:08:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774264083; cv=none; b=slmsjgpNnuJv+FSZ1lc2uM7UyUCTsOdG2/SiJQ2OMnrTbA6J4Ro+vIR/9lKKkMD9lwsdwpZhJYV8flQPkA6F77wvWGdrt9nYd/phwNLSXaUwLCnrMBT+5WRolDZ5UCMVQ2ni0iz16+dg4xgWG6H333x3Gvjd7Kl1zwEyCUaqu9U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774264083; c=relaxed/simple; bh=sGE3qogMX8J2qFrjrt53auriN+DGLFlNdBYXb1qnB40=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=nAnwffo6M0Y+N6hh9NLXMqIvIGGfopRRWhl3cf7J2VzZWkri0dq1KrgK6pCVUL6wulsG971Z3nO3XmwAMBr21rkItukyiRCReuVIdOqrI/NpWP4TKWVTmLXFxqzmmFWq6IP3BNL9qlEKkSFl+s4TiltuR7Zel0zp6z/9Ljumk5Y= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: 89aeb99226a811f1a21c59e7364eecb8-20260323 X-CTIC-Tags: HR_CC_COUNT, HR_CC_DOMAIN_COUNT, HR_CC_NAME, HR_CC_NO_NAME, HR_CTE_8B HR_CTT_MISS, HR_DATE_H, HR_DATE_WKD, HR_DATE_ZONE, HR_FROM_NAME HR_SJ_DIGIT_LEN, HR_SJ_LANG, HR_SJ_LEN, HR_SJ_LETTER, HR_SJ_NOR_SYM HR_SJ_PHRASE, HR_SJ_PHRASE_LEN, HR_SJ_WS, HR_TO_COUNT, HR_TO_DOMAIN_COUNT HR_TO_NO_NAME, IP_TRUSTED, SRC_TRUSTED, DN_TRUSTED, SA_EXISTED SN_EXISTED, SPF_NOPASS, DKIM_NOPASS, DMARC_NOPASS, UD_TRUSTED CIE_BAD, CIE_GOOD, CIE_GOOD_SPF, GTI_FG_BS, GTI_RG_INFO GTI_C_BU, AMN_GOOD, ABX_BLACK, ABX_EXPLOIT, ABX_HEURISTIC ABX_MISS_RDNS X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.11,REQID:42812116-3904-4384-bae5-e56b318f6d4c,IP:20, URL:25,TC:0,Content:-25,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,AC TION:release,TS:15 X-CID-INFO: VERSION:1.3.11,REQID:42812116-3904-4384-bae5-e56b318f6d4c,IP:20,UR L:25,TC:0,Content:-25,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTI ON:release,TS:15 X-CID-META: VersionHash:89c9d04,CLOUDID:c09e72561b1725f47da42b384561751d,BulkI D:260323190756G9L0BELF,BulkQuantity:0,Recheck:0,SF:17|19|38|66|78|81|82|10 2|127|850|898,TC:nil,Content:0|15|50,EDM:-3,IP:-2,URL:11|94|81|1,File:nil, RT:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,D KP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR,TF_CID_SPAM_FAS,TF_CID_SPAM_FSD,TF_CID_SPAM_ULN X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: 89aeb99226a811f1a21c59e7364eecb8-20260323 X-User: duanchenghao@kylinos.cn Received: from localhost.localdomain [(183.242.174.23)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA) with ESMTP id 2109757586; Mon, 23 Mar 2026 19:07:53 +0800 From: Chenghao Duan To: pasha.tatashin@soleen.com, rppt@kernel.org, pratyush@kernel.org, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: jianghaoran@kylinos.cn, Chenghao Duan Subject: [PATCH v2 1/4] mm/memfd: use folio_nr_pages() for shmem inode accounting Date: Mon, 23 Mar 2026 19:07:44 +0800 Message-Id: <20260323110747.193569-2-duanchenghao@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260323110747.193569-1-duanchenghao@kylinos.cn> References: <20260323110747.193569-1-duanchenghao@kylinos.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" memfd_luo_retrieve_folios() called shmem_inode_acct_blocks() and shmem_recalc_inode() with hardcoded 1 instead of the actual folio page count. memfd may use large folios (THP/hugepages), causing quota/limit under-accounting and incorrect stat output. Fix by using folio_nr_pages(folio) for both functions. Issue found by AI review and suggested by Pratyush Yadav . https://sashiko.dev/#/patchset/20260319012845.29570-1-duanchenghao%40kylino= s.cn Suggested-by: Pratyush Yadav Signed-off-by: Chenghao Duan --- mm/memfd_luo.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/mm/memfd_luo.c b/mm/memfd_luo.c index b8edb9f981d7..953440994ad2 100644 --- a/mm/memfd_luo.c +++ b/mm/memfd_luo.c @@ -395,6 +395,7 @@ static int memfd_luo_retrieve_folios(struct file *file, struct inode *inode =3D file_inode(file); struct address_space *mapping =3D inode->i_mapping; struct folio *folio; + long npages; int err =3D -EIO; long i; =20 @@ -441,14 +442,15 @@ static int memfd_luo_retrieve_folios(struct file *fil= e, if (flags & MEMFD_LUO_FOLIO_DIRTY) folio_mark_dirty(folio); =20 - err =3D shmem_inode_acct_blocks(inode, 1); + npages =3D folio_nr_pages(folio); + err =3D shmem_inode_acct_blocks(inode, npages); if (err) { - pr_err("shmem: failed to account folio index %ld: %d\n", - i, err); + pr_err("shmem: failed to account folio index %ld(%ld pages): %d\n", + i, npages, err); goto unlock_folio; } =20 - shmem_recalc_inode(inode, 1, 0); + shmem_recalc_inode(inode, npages, 0); folio_add_lru(folio); folio_unlock(folio); folio_put(folio); --=20 2.25.1 From nobody Fri Apr 3 20:55:23 2026 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (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 2466D397E72 for ; Mon, 23 Mar 2026 11:08:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774264085; cv=none; b=pV9NQhWQ30DCx+OYemsvwBVFvek10OZjA+LrUlQd8KCsSArufWCzJjnYqkXzpWLlBSlDtQGAQ6+c85xx+u1ZXCPDv98ukw2RslNZyIYP3zTdORWlZTsBwTJkIjIab4TBag33qIDVer+2/j06U/XWH8R7ejx93Jw0lLHSkZFFypI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; 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Mon, 23 Mar 2026 19:07:54 +0800 From: Chenghao Duan To: pasha.tatashin@soleen.com, rppt@kernel.org, pratyush@kernel.org, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: jianghaoran@kylinos.cn, Chenghao Duan Subject: [PATCH v2 2/4] mm/memfd_luo: optimize shmem_recalc_inode calls in retrieve path Date: Mon, 23 Mar 2026 19:07:45 +0800 Message-Id: <20260323110747.193569-3-duanchenghao@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260323110747.193569-1-duanchenghao@kylinos.cn> References: <20260323110747.193569-1-duanchenghao@kylinos.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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. Reviewed-by: Pasha Tatashin Signed-off-by: Chenghao Duan --- mm/memfd_luo.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/mm/memfd_luo.c b/mm/memfd_luo.c index 953440994ad2..2a01eaff03c2 100644 --- a/mm/memfd_luo.c +++ b/mm/memfd_luo.c @@ -395,7 +395,7 @@ static int memfd_luo_retrieve_folios(struct file *file, struct inode *inode =3D file_inode(file); struct address_space *mapping =3D inode->i_mapping; struct folio *folio; - long npages; + long npages, nr_added_pages =3D 0; int err =3D -EIO; long i; =20 @@ -450,12 +450,14 @@ static int memfd_luo_retrieve_folios(struct file *fil= e, goto unlock_folio; } =20 - shmem_recalc_inode(inode, npages, 0); + nr_added_pages +=3D npages; folio_add_lru(folio); folio_unlock(folio); folio_put(folio); } =20 + shmem_recalc_inode(inode, nr_added_pages, 0); + return 0; =20 unlock_folio: @@ -474,6 +476,8 @@ static int memfd_luo_retrieve_folios(struct file *file, folio_put(folio); } =20 + shmem_recalc_inode(inode, nr_added_pages, 0); 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Mon, 23 Mar 2026 19:07:55 +0800 From: Chenghao Duan To: pasha.tatashin@soleen.com, rppt@kernel.org, pratyush@kernel.org, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: jianghaoran@kylinos.cn, Chenghao Duan Subject: [PATCH v2 3/4] mm/memfd_luo: remove unnecessary memset in zero-size memfd path Date: Mon, 23 Mar 2026 19:07:46 +0800 Message-Id: <20260323110747.193569-4-duanchenghao@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260323110747.193569-1-duanchenghao@kylinos.cn> References: <20260323110747.193569-1-duanchenghao@kylinos.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The memset(kho_vmalloc, 0, sizeof(*kho_vmalloc)) call in the zero-size file handling path is unnecessary because the allocation of the ser structure already uses the __GFP_ZERO flag, ensuring the memory is already zero-initialized. Reviewed-by: Pratyush Yadav Reviewed-by: Pasha Tatashin Reviewed-by: Mike Rapoport (Microsoft) Signed-off-by: Chenghao Duan --- mm/memfd_luo.c | 1 - 1 file changed, 1 deletion(-) diff --git a/mm/memfd_luo.c b/mm/memfd_luo.c index 2a01eaff03c2..bf827e574bec 100644 --- a/mm/memfd_luo.c +++ b/mm/memfd_luo.c @@ -103,7 +103,6 @@ static int memfd_luo_preserve_folios(struct file *file, if (!size) { *nr_foliosp =3D 0; *out_folios_ser =3D NULL; - memset(kho_vmalloc, 0, sizeof(*kho_vmalloc)); return 0; } =20 --=20 2.25.1 From nobody Fri Apr 3 20:55:23 2026 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (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 25D29397696 for ; Mon, 23 Mar 2026 11:08:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774264083; cv=none; b=FuxFKCaKc5o19l0M21c0j3oYXC1nxo0rSnnsT37WBIFDUcKE3j836FbzBLce5rH4kkoWmODgwXwlBa4V058M0sbHQ69dKJKS7wKVh/YT5vnIJTWxWGaUg2TLJhXkls4r1t4EeaTXJWtEEJbPMiZKzskT2XEd7OXsvVs0vwpemBk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774264083; c=relaxed/simple; bh=uUgdHpENYTjHqdnKt7NecqNtXv1oSS7bEgexzn0mEKo=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=kET2E4HHB5IPpf7g4tAY30ePa1y1EBOgHVaiPuuZdcL/RzQW4eXUWU3dPHSLQFXHY/JOloq6sBOknHYbFohJdZySPRnyxVMYEF80h1hekupX5JRvKZNK+HtD6dmZl/kLQj+YKRP6BozSn/nIMNRCiEu2EDzA3mEJa8mBhNOMRRE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: 8bcffcd626a811f1a21c59e7364eecb8-20260323 X-CTIC-Tags: HR_CC_COUNT, HR_CC_DOMAIN_COUNT, HR_CC_NAME, HR_CC_NO_NAME, HR_CTE_8B HR_CTT_MISS, HR_DATE_H, HR_DATE_WKD, HR_DATE_ZONE, HR_FROM_NAME HR_SJ_DIGIT_LEN, HR_SJ_LANG, HR_SJ_LEN, HR_SJ_LETTER, HR_SJ_NOR_SYM HR_SJ_PHRASE, HR_SJ_PHRASE_LEN, HR_SJ_WS, HR_TO_COUNT, HR_TO_DOMAIN_COUNT HR_TO_NO_NAME, IP_TRUSTED, SRC_TRUSTED, DN_TRUSTED, SA_EXISTED SN_EXISTED, SPF_NOPASS, DKIM_NOPASS, DMARC_NOPASS, CIE_BAD CIE_GOOD, CIE_GOOD_SPF, GTI_FG_BS, GTI_RG_INFO, GTI_C_BU AMN_GOOD, ABX_BLACK, ABX_EXPLOIT, ABX_HEURISTIC, ABX_MISS_RDNS X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.11,REQID:9374473c-5e3a-41fb-b030-7bade1dc767d,IP:20, URL:0,TC:0,Content:0,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTIO N:release,TS:15 X-CID-INFO: VERSION:1.3.11,REQID:9374473c-5e3a-41fb-b030-7bade1dc767d,IP:20,UR L:0,TC:0,Content:0,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:15 X-CID-META: VersionHash:89c9d04,CLOUDID:35d7d280d89c5fa9f44492b59306af82,BulkI D:260323190759QJ8F4FG9,BulkQuantity:0,Recheck:0,SF:17|19|38|66|78|81|82|10 2|127|850|898,TC:nil,Content:0|15|50,EDM:-3,IP:-2,URL:0,File:nil,RT:nil,Bu lk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR: 0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR,TF_CID_SPAM_FAS,TF_CID_SPAM_FSD X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: 8bcffcd626a811f1a21c59e7364eecb8-20260323 X-User: duanchenghao@kylinos.cn Received: from localhost.localdomain [(183.242.174.23)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA) with ESMTP id 1845427003; Mon, 23 Mar 2026 19:07:56 +0800 From: Chenghao Duan To: pasha.tatashin@soleen.com, rppt@kernel.org, pratyush@kernel.org, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: jianghaoran@kylinos.cn, Chenghao Duan Subject: [PATCH v2 4/4] mm/memfd_luo: use i_size_write() to set inode size during retrieve Date: Mon, 23 Mar 2026 19:07:47 +0800 Message-Id: <20260323110747.193569-5-duanchenghao@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260323110747.193569-1-duanchenghao@kylinos.cn> References: <20260323110747.193569-1-duanchenghao@kylinos.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Use i_size_write() instead of directly assigning to inode->i_size when restoring the memfd size in memfd_luo_retrieve(), to keep code consistency. No functional change intended. Reviewed-by: Pasha Tatashin Signed-off-by: Chenghao Duan --- mm/memfd_luo.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/memfd_luo.c b/mm/memfd_luo.c index bf827e574bec..76edf9a3f5b5 100644 --- a/mm/memfd_luo.c +++ b/mm/memfd_luo.c @@ -499,7 +499,7 @@ static int memfd_luo_retrieve(struct liveupdate_file_op= _args *args) } =20 vfs_setpos(file, ser->pos, MAX_LFS_FILESIZE); - file->f_inode->i_size =3D ser->size; + i_size_write(file_inode(file), ser->size); =20 if (ser->nr_folios) { folios_ser =3D kho_restore_vmalloc(&ser->folios); --=20 2.25.1