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 907A913B7AE for ; Wed, 29 Apr 2026 13:09:06 +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=1777468146; cv=none; b=PnvRDDcl7MrgprW1XhQmox0XQXMww17W5P6b+kwoI8/GRT3FQmu0FsoSr88A8Bf6GbOHI9LSYh2gHinG+BpE4y99mZryNxHLnFdP+73gAFoMlwpObc8wkkEkgSVgZGYNVMiHf2AJ/8kI3dVb0fvRyk6yh0nk2/ugy9IaH8q4zIk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777468146; c=relaxed/simple; bh=phelkqdJ5Az2Y7Ef3osewM3YJOQ4BIPntrN5BPnWc14=; h=Date:To:From:Subject:Message-Id; b=i+Cmv80jxmxFLNWrUebsCBny7e1Mm3gfYQ5KY06yCqx448CVOIlZ6zicMiVWdUBB37FXHD24P4QKiI06tFhwjU7JYv+PAUMULvX5RvvE+UtqYqUEPJwLdqaBGQGrFzVnCsPmh8G6MvqX0+ag6hW5X3BgbgkhuiyI2Pp45Wn6NRQ= 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=sRpfMcwj; 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="sRpfMcwj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 13B52C19425; Wed, 29 Apr 2026 13:09:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1777468146; bh=phelkqdJ5Az2Y7Ef3osewM3YJOQ4BIPntrN5BPnWc14=; h=Date:To:From:Subject:From; b=sRpfMcwjOaQLIw3cWLeeuU9DWkaLrDbIcDTDkHSW6QwhC2/Scae+b9WmZuVDtT/hE T29eXKoxAB+MVEDVTznfKVioBkdwsurO1KoTQsFx9R3xNPf57d7/C6WTmbfmYwkWB2 NSuz8kk/QO6ifrSB9yyVoXSWeyycblYt/VT/CJqA= Date: Wed, 29 Apr 2026 06:09:05 -0700 To: mm-commits@vger.kernel.org,ziy@nvidia.com,vbabka@kernel.org,surenb@google.com,shuah@kernel.org,ryan.roberts@arm.com,rppt@kernel.org,npache@redhat.com,mhocko@suse.com,ljs@kernel.org,liam@infradead.org,lance.yang@linux.dev,dev.jain@arm.com,david@kernel.org,baolin.wang@linux.alibaba.com,baohua@kernel.org,agarwal.vineet2006@gmail.com,akpm@linux-foundation.org From: Andrew Morton Subject: + selftests-mm-khugepaged-initialize-file-contents-via-mmap.patch added to mm-new branch Message-Id: <20260429130906.13B52C19425@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: selftests/mm: khugepaged: initialize file contents via mmap has been added to the -mm mm-new branch. Its filename is selftests-mm-khugepaged-initialize-file-contents-via-mmap.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-khugepaged-initialize-file-contents-via-mmap.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: Vineet Agarwal Subject: selftests/mm: khugepaged: initialize file contents via mmap Date: Wed, 29 Apr 2026 17:28:16 +0530 file_setup_area() currently allocates anonymous memory, fills it, and writes it into the backing file used for collapse testing. Instead of copying data through write(), resize the file with ftruncate(), map it directly with MAP_SHARED, and initialize the mapped area in place. This simplifies the setup path and avoids the need for explicit partial write handling. Link: https://lore.kernel.org/20260429115816.98824-1-agarwal.vineet2006@gmail.com Signed-off-by: Vineet Agarwal Reviewed-by: Zi Yan Tested-by: Zi Yan Cc: Baolin Wang Cc: Barry Song Cc: David Hildenbrand Cc: Dev Jain Cc: Lance Yang Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Nico Pache Cc: Ryan Roberts Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- tools/testing/selftests/mm/khugepaged.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) --- a/tools/testing/selftests/mm/khugepaged.c~selftests-mm-khugepaged-initialize-file-contents-via-mmap +++ a/tools/testing/selftests/mm/khugepaged.c @@ -373,7 +373,7 @@ static void *file_setup_area(int nr_hpag unlink(finfo.path); /* Cleanup from previous failed tests */ printf("Creating %s for collapse%s...", finfo.path, finfo.type == VMA_SHMEM ? " (tmpfs)" : ""); - fd = open(finfo.path, O_DSYNC | O_CREAT | O_RDWR | O_TRUNC | O_EXCL, + fd = open(finfo.path, O_CREAT | O_RDWR | O_TRUNC | O_EXCL, 777); if (fd < 0) { perror("open()"); @@ -381,9 +381,21 @@ static void *file_setup_area(int nr_hpag } size = nr_hpages * hpage_pmd_size; - p = alloc_mapping(nr_hpages); + if (ftruncate(fd, size)) { + perror("ftruncate()"); + exit(EXIT_FAILURE); + } + p = mmap(BASE_ADDR, size, PROT_READ | PROT_WRITE, + MAP_SHARED, fd, 0); + if (p != BASE_ADDR) { + perror("mmap()"); + exit(EXIT_FAILURE); + } fill_memory(p, 0, size); - write(fd, p, size); + if (msync(p, size, MS_SYNC)) { + perror("msync()"); + exit(EXIT_FAILURE); + } close(fd); munmap(p, size); success("OK"); _ Patches currently in -mm which might be from agarwal.vineet2006@gmail.com are selftests-mm-khugepaged-initialize-file-contents-via-mmap.patch