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 7AD6D35950 for ; Tue, 14 Jan 2025 20:50:03 +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=1736887803; cv=none; b=SwYYzeo/PWJj0WmYn5NlfV8yw2m+vKMeuStfy8ZW0z7fYm7cz0bhfC7cPPBKfmqNEytE1YtOz+vcXzQWnz+rN6hAQc23fmWeRnYCKLJlC8Uc45PvMSL+xRhA4gfEZj1uTCSHz0J3ePqA3K9dnK+DRSAakKKdpx+y9bygwBUiCtY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736887803; c=relaxed/simple; bh=xywEB6174dtPdWBjW29hQKectre6rAgw2JolaXd3fVc=; h=Date:From:To:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=UADNhMFhRZS9Cq1e5s1MzOa4JSYzxYcvPai5//ah4fMaKysF1Oy2PkOUjHQuaYRYfgS05udOzCTNPmCy/C4DvYowPVYrxqwG5bGWLef+/9XuXvuRFonf9Pc6bk05OWEQdUeLJ9D5BSBYi7Nj+L4lFdEopanq39QsVT9tbi+5mdQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JHMZmTL8; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="JHMZmTL8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DF0B9C4CEDD; Tue, 14 Jan 2025 20:50:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1736887803; bh=xywEB6174dtPdWBjW29hQKectre6rAgw2JolaXd3fVc=; h=Date:From:To:Subject:References:In-Reply-To:From; b=JHMZmTL8Fe6Rym0mjG+KS+W65aWe3GEdp6IkPDsKtZwSfxpOCeG2ryggkoVkbRQTt p8lRGU+E1mVGGrWpBtZ7PRP1XnUVQ82K0PS46IeojcbEetDhO2g9GZNrgd3/pxzbLi P7HSuZUqodVTiQY5MM+fTm/+92tsJteExJb0rZ4TgbWneL6KZ4wePv7xE3agGHe/Hj iPUrz+zzdiWocw7s6nCGqtdKuBvDEg0WJajUF89zcTBLrjkVXlJRppzUVBiwNvicd0 5WDTOfL4w/Q8bxDP5I2dpUFrNMjG7i2WyRnChM4WlLyXNGGzqhXYeI0usam0xRhfMQ GRBfS2SCztimw== Date: Tue, 14 Jan 2025 20:50:01 +0000 From: Jaegeuk Kim To: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Subject: Re: [PATCH 2/2 v2] f2fs: add a sysfs entry to request donate file-backed pages Message-ID: References: <20250113183933.1268282-1-jaegeuk@kernel.org> <20250113183933.1268282-2-jaegeuk@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250113183933.1268282-2-jaegeuk@kernel.org> 1. ioctl(fd1, F2FS_IOC_DONATE_RANGE, {0,3}); 2. ioctl(fd2, F2FS_IOC_DONATE_RANGE, {1,2}); 3. ioctl(fd3, F2FS_IOC_DONATE_RANGE, {3,1}); 4. echo 3 > /sys/fs/f2fs/blk/donate_caches will reclaim 3 page cache ranges, registered by #1, #2, and #3. Signed-off-by: Jaegeuk Kim --- Change log from v1: - don't use sbi->ndirty_inode which is not defined by default Documentation/ABI/testing/sysfs-fs-f2fs | 7 +++++++ fs/f2fs/f2fs.h | 4 ++++ fs/f2fs/shrinker.c | 27 +++++++++++++++++++++++++ fs/f2fs/sysfs.c | 8 ++++++++ 4 files changed, 46 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs index 3e1630c70d8a..6f9d8b8889fd 100644 --- a/Documentation/ABI/testing/sysfs-fs-f2fs +++ b/Documentation/ABI/testing/sysfs-fs-f2fs @@ -828,3 +828,10 @@ Date: November 2024 Contact: "Chao Yu" Description: It controls max read extent count for per-inode, the value of threshold is 10240 by default. + +What: /sys/fs/f2fs//donate_caches +Date: December 2024 +Contact: "Jaegeuk Kim" +Description: It reclaims the certian file-backed pages registered by + ioctl(F2FS_IOC_DONATE_RANGE). + For example, writing N tries to drop N address spaces in LRU. diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 7ce3e3eab17a..6c434ae94cb1 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -1635,6 +1635,9 @@ struct f2fs_sb_info { unsigned int warm_data_age_threshold; unsigned int last_age_weight; + /* control donate caches */ + unsigned int donate_caches; + /* basic filesystem units */ unsigned int log_sectors_per_block; /* log2 sectors per block */ unsigned int log_blocksize; /* log2 block size */ @@ -4256,6 +4259,7 @@ unsigned long f2fs_shrink_count(struct shrinker *shrink, struct shrink_control *sc); unsigned long f2fs_shrink_scan(struct shrinker *shrink, struct shrink_control *sc); +void f2fs_donate_caches(struct f2fs_sb_info *sbi); void f2fs_join_shrinker(struct f2fs_sb_info *sbi); void f2fs_leave_shrinker(struct f2fs_sb_info *sbi); diff --git a/fs/f2fs/shrinker.c b/fs/f2fs/shrinker.c index 83d6fb97dcae..a3e2063392a7 100644 --- a/fs/f2fs/shrinker.c +++ b/fs/f2fs/shrinker.c @@ -130,6 +130,33 @@ unsigned long f2fs_shrink_scan(struct shrinker *shrink, return freed; } +void f2fs_donate_caches(struct f2fs_sb_info *sbi) +{ + struct inode *inode = NULL; + struct f2fs_inode_info *fi; + int nfiles = sbi->donate_caches; +next: + spin_lock(&sbi->inode_lock[DONATE_INODE]); + if (list_empty(&sbi->inode_list[DONATE_INODE]) || !nfiles) { + spin_unlock(&sbi->inode_lock[DONATE_INODE]); + return; + } + + fi = list_first_entry(&sbi->inode_list[DONATE_INODE], + struct f2fs_inode_info, gdonate_list); + list_move_tail(&fi->gdonate_list, &sbi->inode_list[DONATE_INODE]); + inode = igrab(&fi->vfs_inode); + spin_unlock(&sbi->inode_lock[DONATE_INODE]); + + if (inode) { + invalidate_inode_pages2_range(inode->i_mapping, + fi->donate_start, fi->donate_end); + iput(inode); + } + if (nfiles--) + goto next; +} + void f2fs_join_shrinker(struct f2fs_sb_info *sbi) { spin_lock(&f2fs_list_lock); diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c index 6b99dc49f776..2a6b01257ad8 100644 --- a/fs/f2fs/sysfs.c +++ b/fs/f2fs/sysfs.c @@ -811,6 +811,12 @@ static ssize_t __sbi_store(struct f2fs_attr *a, return count; } + if (!strcmp(a->attr.name, "donate_caches")) { + sbi->donate_caches = t; + f2fs_donate_caches(sbi); + return count; + } + *ui = (unsigned int)t; return count; @@ -1030,6 +1036,7 @@ F2FS_SBI_GENERAL_RW_ATTR(max_victim_search); F2FS_SBI_GENERAL_RW_ATTR(migration_granularity); F2FS_SBI_GENERAL_RW_ATTR(migration_window_granularity); F2FS_SBI_GENERAL_RW_ATTR(dir_level); +F2FS_SBI_GENERAL_RW_ATTR(donate_caches); #ifdef CONFIG_F2FS_IOSTAT F2FS_SBI_GENERAL_RW_ATTR(iostat_enable); F2FS_SBI_GENERAL_RW_ATTR(iostat_period_ms); @@ -1178,6 +1185,7 @@ static struct attribute *f2fs_attrs[] = { ATTR_LIST(migration_granularity), ATTR_LIST(migration_window_granularity), ATTR_LIST(dir_level), + ATTR_LIST(donate_caches), ATTR_LIST(ram_thresh), ATTR_LIST(ra_nid_pages), ATTR_LIST(dirty_nats_ratio), -- 2.48.0.rc2.279.g1de40edade-goog