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Fri, 30 Dec 2022 13:53:00 -0800 (PST) Date: Fri, 30 Dec 2022 14:52:52 -0700 In-Reply-To: <20221230215252.2628425-1-yuzhao@google.com> Message-Id: <20221230215252.2628425-2-yuzhao@google.com> Mime-Version: 1.0 References: <20221230215252.2628425-1-yuzhao@google.com> X-Mailer: git-send-email 2.39.0.314.g84b9a713c41-goog Subject: [PATCH mm-unstable v2 2/2] mm: support POSIX_FADV_NOREUSE From: Yu Zhao To: Andrew Morton Cc: Alexander Viro , Andrea Righi , Johannes Weiner , Michael Larabel , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@google.com, Yu Zhao X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 07446180007 X-Stat-Signature: wnqouzykabmyr7w4uc5au5aspk1zjxwa X-HE-Tag: 1672437180-594127 X-HE-Meta: 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 N50lA0Za hlUTFYxsxqtmHZXvsuUwT+YhvntUN9mwhsRe5joSQZ+6cH7APZPY9NniBXi0w5Kzu91SJ8gZCD8U/ftvsvFLtOe3qLd3NQn6wnfwCT2UNa/UpdPJ487mJ/UQ2CgZ/7QQUx2/N2/lQxIcBnrGizKTRaXniJZFJa0teCqvTSItMynwLG0X7KMvYxh5dXvgv6tiHiRc5VZXmxL3WlSMp4X7oQwNIoY6Wxe+JfnbFdk4grHB37HIYvQvScacrOv6AVr2O9w4tBWg6kJOodd34yVzog+YHawytQcor2+fePffNfqXqv9XjoRIqt7DzwYHJb+vMlED8IeqXKCjupzuWr4VVy5pK5qQiBAPoT8SvmNA/n4N/29NITpGbPbvMYhfpkb0IR86w3ivM688qEzzsZE4fAoX/moOG99Up74wc X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: This patch adds POSIX_FADV_NOREUSE to vma_has_recency() so that the LRU algorithm can ignore access to mapped files marked by this flag. The advantages of POSIX_FADV_NOREUSE are: 1. Unlike MADV_SEQUENTIAL and MADV_RANDOM, it does not alter the default readahead behavior. 2. Unlike MADV_SEQUENTIAL and MADV_RANDOM, it does not split VMAs and therefore does not take mmap_lock. 3. Unlike MADV_COLD, setting it has a negligible cost, regardless of how many pages it affects. Its limitations are: 1. Like POSIX_FADV_RANDOM and POSIX_FADV_SEQUENTIAL, it currently does not support range. IOW, its scope is the entire file. 2. It currently does not ignore access through file descriptors. Specifically, for the active/inactive LRU, given a file page shared by two users and one of them having set POSIX_FADV_NOREUSE on the file, this page will be activated upon the second user accessing it. This corner case can be covered by checking POSIX_FADV_NOREUSE before calling folio_mark_accessed() on the read path. But it is considered not worth the effort. There have been a few attempts to support POSIX_FADV_NOREUSE, e.g., [1]. This time the goal is to fill a niche: a few desktop applications, e.g., large file transferring and video encoding/decoding, want fast file streaming with mmap() rather than direct IO. Among those applications, an SVT-AV1 regression was reported when running with MGLRU [2]. The following test can reproduce that regression. kb=$(awk '/MemTotal/ { print $2 }' /proc/meminfo) kb=$((kb - 8*1024*1024)) modprobe brd rd_nr=1 rd_size=$kb dd if=/dev/zero of=/dev/ram0 bs=1M mkfs.ext4 /dev/ram0 mount /dev/ram0 /mnt/ swapoff -a fallocate -l 8G /mnt/swapfile mkswap /mnt/swapfile swapon /mnt/swapfile wget http://ultravideo.cs.tut.fi/video/Bosphorus_3840x2160_120fps_420_8bit_YUV_Y4M.7z 7z e -o/mnt/ Bosphorus_3840x2160_120fps_420_8bit_YUV_Y4M.7z SvtAv1EncApp --preset 12 -w 3840 -h 2160 \ -i /mnt/Bosphorus_3840x2160.y4m For MGLRU, the following change showed a [9-11]% increase in FPS, which makes it on par with the active/inactive LRU. patch Source/App/EncApp/EbAppMain.c < #include 35d35 < #include /* _O_BINARY */ 117a118 > posix_fadvise(config->mmap.fd, 0, 0, POSIX_FADV_NOREUSE); EOF [1] https://lore.kernel.org/r/1308923350-7932-1-git-send-email-andrea@betterlinux.com/ [2] https://openbenchmarking.org/result/2209259-PTS-MGLRU8GB57 Signed-off-by: Yu Zhao --- include/linux/fs.h | 2 ++ include/linux/mm_inline.h | 3 +++ mm/fadvise.c | 5 ++++- 3 files changed, 9 insertions(+), 1 deletion(-) diff --git a/include/linux/fs.h b/include/linux/fs.h index 066555ad1bf8..5660ed0edf1a 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -166,6 +166,8 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset, /* File supports DIRECT IO */ #define FMODE_CAN_ODIRECT ((__force fmode_t)0x400000) +#define FMODE_NOREUSE ((__force fmode_t)0x800000) + /* File was opened by fanotify and shouldn't generate fanotify events */ #define FMODE_NONOTIFY ((__force fmode_t)0x4000000) diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h index fe5b8449e14a..064f92c78bfa 100644 --- a/include/linux/mm_inline.h +++ b/include/linux/mm_inline.h @@ -600,6 +600,9 @@ static inline bool vma_has_recency(struct vm_area_struct *vma) if (vma->vm_flags & (VM_SEQ_READ | VM_RAND_READ)) return false; + if (vma->vm_file && (vma->vm_file->f_mode & FMODE_NOREUSE)) + return false; + return true; } diff --git a/mm/fadvise.c b/mm/fadvise.c index bf04fec87f35..fb7c5f43fd2a 100644 --- a/mm/fadvise.c +++ b/mm/fadvise.c @@ -80,7 +80,7 @@ int generic_fadvise(struct file *file, loff_t offset, loff_t len, int advice) case POSIX_FADV_NORMAL: file->f_ra.ra_pages = bdi->ra_pages; spin_lock(&file->f_lock); - file->f_mode &= ~FMODE_RANDOM; + file->f_mode &= ~(FMODE_RANDOM | FMODE_NOREUSE); spin_unlock(&file->f_lock); break; case POSIX_FADV_RANDOM: @@ -107,6 +107,9 @@ int generic_fadvise(struct file *file, loff_t offset, loff_t len, int advice) force_page_cache_readahead(mapping, file, start_index, nrpages); break; case POSIX_FADV_NOREUSE: + spin_lock(&file->f_lock); + file->f_mode |= FMODE_NOREUSE; + spin_unlock(&file->f_lock); break; case POSIX_FADV_DONTNEED: __filemap_fdatawrite_range(mapping, offset, endbyte,