From nobody Wed Feb 5 16:57:28 2025 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 0C3E319F10A for ; Fri, 17 Jan 2025 16:43:59 +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=1737132239; cv=none; b=WL/5k2/XUac4v90bB3hOGiDAK5pbHAyzsPNlxt+n99Mw/irWi5J5ZkoXSzhF72tw8PyRB4C5ojKN4a3NExihJbsrvY2WSK1J7/fkP0HxCzlhjFuYxp8hdXUIeuixTJmf8+nxlc1rTG/ioU6gPJ9z3xFQ52YkL8pGoGPgO//JsZw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737132239; c=relaxed/simple; bh=F0vkTJTkyTvfngV4uDlYkjuPGTuyhZdjL5IwXGCY0oc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FT9siKZH+W2ivctbTkSyxId8ni3MYOqiRXerNss/7BPMh8d0cF3F3PkBFZMVqlledV2jWrDk8c/+KMf+zgz113qjYLQycSLvwEC78JKXElItleGYc5+DzGoi8zebbRrlY4J68IR/JsI5kUuW5rN8FHvXwF5A3LC1nBZNFm1dlQE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=l/p07+nL; 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="l/p07+nL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C046EC4CEE4; Fri, 17 Jan 2025 16:43:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1737132238; bh=F0vkTJTkyTvfngV4uDlYkjuPGTuyhZdjL5IwXGCY0oc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=l/p07+nLpXRj0WiPsh9fF1NE7XMzh09Qa/w+Vra5F5NbsyTvdYX24AMVeFUaPRZSd vvgevZfpt3vgNL802WFab4d2Dt5fOPnkQ0xe+f6YvI/BggTZo+z40skRERDuuzG1B8 C/IQN/dMFQ2WyZfEOxXwyMNs8C/gAJFNyActsP/Qp/zz3ADyoD3V5kK4r8ntz8j6tx iML8V788vIyGfre51L9Kkzw7gCMN9lCQZ6dP9PIOlKd9z3O4Qzhvyn15zumuydqtfb RrU9sKvIUtOrEbFxe9/0sCgq8H7vKpnsRPOJX597Ab5fblHTcTjVP0MVX1RxzMaYsN ct1VharAAT/FA== From: Jaegeuk Kim To: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Cc: Jaegeuk Kim Subject: [PATCH 2/2] f2fs: add a sysfs entry to request donate file-backed pages Date: Fri, 17 Jan 2025 16:41:18 +0000 Message-ID: <20250117164350.2419840-3-jaegeuk@kernel.org> X-Mailer: git-send-email 2.48.0.rc2.279.g1de40edade-goog In-Reply-To: <20250117164350.2419840-1-jaegeuk@kernel.org> References: <20250117164350.2419840-1-jaegeuk@kernel.org> 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" 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 --- Documentation/ABI/testing/sysfs-fs-f2fs | 7 +++++++ fs/f2fs/f2fs.h | 2 ++ fs/f2fs/shrinker.c | 27 +++++++++++++++++++++++++ fs/f2fs/sysfs.c | 8 ++++++++ 4 files changed, 44 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/te= sting/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 951fbc3f94c7..399ddd10a94f 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -1637,6 +1637,7 @@ struct f2fs_sb_info { =20 /* control donate caches */ unsigned int donate_files; + unsigned int donate_caches; =20 /* basic filesystem units */ unsigned int log_sectors_per_block; /* log2 sectors per block */ @@ -4259,6 +4260,7 @@ unsigned long f2fs_shrink_count(struct shrinker *shri= nk, 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); =20 diff --git a/fs/f2fs/shrinker.c b/fs/f2fs/shrinker.c index 83d6fb97dcae..22f62813910b 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; } =20 +void f2fs_donate_caches(struct f2fs_sb_info *sbi) +{ + struct inode *inode; + struct f2fs_inode_info *fi; + int nfiles =3D sbi->donate_caches; + + while (nfiles--) { + spin_lock(&sbi->inode_lock[DONATE_INODE]); + if (list_empty(&sbi->inode_list[DONATE_INODE])) { + spin_unlock(&sbi->inode_lock[DONATE_INODE]); + break; + } + fi =3D 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 =3D igrab(&fi->vfs_inode); + spin_unlock(&sbi->inode_lock[DONATE_INODE]); + + if (!inode) + continue; + + invalidate_inode_pages2_range(inode->i_mapping, + fi->donate_start, fi->donate_end); + iput(inode); + } +} + 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..f81190fabdd3 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; } =20 + if (!strcmp(a->attr.name, "donate_caches")) { + sbi->donate_caches =3D min(t, sbi->donate_files); + f2fs_donate_caches(sbi); + return count; + } + *ui =3D (unsigned int)t; =20 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[] =3D { 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), --=20 2.48.0.rc2.279.g1de40edade-goog