From nobody Fri Oct 10 21:13:59 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 AEEED149C4D for ; Thu, 12 Jun 2025 14:05:33 +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=1749737133; cv=none; b=N9yehpY8ICjW68XwguHC62xBjp/INbSMiZsq73fFlXJwpcGXDfVDDkJ9pjy0YvR8GYNNikXA8D27P0V4XAtR0OyxduYdXh2XA3sL4Wo41g/9z8vxhQGbV4GqjlLbKkrNqyl+0KXZkcyJKEcQe6NPQN1w/uXFwiNNf7/iFTrDXsE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749737133; c=relaxed/simple; bh=nIwQa+mlLJWbBfrzS2N0M8rMHMjUKwQdZhUJBoyfG/w=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=fDyh0UeC4X1bAd4TCSnJfo5DWpwtna0UziF+CHFdmCj6ixyl0oj2cu/1XpKuaciUMYBFW2W+J6z7LJQpYzUzkwGSLtnzU9RlPjezgPnyIwEth3rha5NRBq/0AiB5hEQ52DEftmJD0ibmTWYW/J3xFpsLqB1pUFEj2f+L0v28Ikg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jDh+STQq; 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="jDh+STQq" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 46230C4CEEA; Thu, 12 Jun 2025 14:05:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1749737133; bh=nIwQa+mlLJWbBfrzS2N0M8rMHMjUKwQdZhUJBoyfG/w=; h=From:To:Cc:Subject:Date:From; b=jDh+STQqbL4vbcLlM9UZu+sTS/XDBoBRloMSaa2X68263QKs5ehPswuW+DV7WjMr7 mrMgGeFUe3B06Ng55eDwbEwN0QHK3ty47qBYIcah0lE+21SN4M8UdfizYTgv7o7LnD LpzCrtES/XxGHK5zQeJfRVgXLkr/Ik+71HTh3JsX/DujBKNS4A4nEFrsORmhTCOMY2 w6epVLxMk9oiXJhv3bDcc3jY3WPlIdKMpzQhbyOssvzmG61n82ilffPTYNvTqlqLEH H/q2dHiaHIjO/sOtHh/yCLVRfTUCKdHtvME4AoB1hK7m6Hms5Szbth9AhZlP3T022/ jreG4HCCtJyZw== From: Chao Yu To: jaegeuk@kernel.org Cc: linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, Chao Yu Subject: [PATCH] f2fs: introduce reserved_pin_section sysfs entry Date: Thu, 12 Jun 2025 22:05:26 +0800 Message-Id: <20250612140526.6435-1-chao@kernel.org> X-Mailer: git-send-email 2.40.1 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" This patch introduces /sys/fs/f2fs//reserved_pin_section for tuning @needed parameter of has_not_enough_free_secs(), if we configure it w/ zero, it can avoid f2fs_gc() as much as possible while fallocating on pinned file. Signed-off-by: Chao Yu --- Documentation/ABI/testing/sysfs-fs-f2fs | 9 +++++++++ fs/f2fs/f2fs.h | 3 +++ fs/f2fs/file.c | 5 ++--- fs/f2fs/super.c | 3 +++ fs/f2fs/sysfs.c | 9 +++++++++ 5 files changed, 26 insertions(+), 3 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/te= sting/sysfs-fs-f2fs index bf03263b9f46..c2a233f2a085 100644 --- a/Documentation/ABI/testing/sysfs-fs-f2fs +++ b/Documentation/ABI/testing/sysfs-fs-f2fs @@ -861,3 +861,12 @@ Description: This is a read-only entry to show the val= ue of sb.s_encoding_flags, SB_ENC_STRICT_MODE_FL 0x00000001 SB_ENC_NO_COMPAT_FALLBACK_FL 0x00000002 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +What: /sys/fs/f2fs//reserved_pin_section +Date: June 2025 +Contact: "Chao Yu" +Description: This threshold is used to control triggering garbage collecti= on while + fallocating on pinned file, so, it can guarantee there is enough free + reserved section before preallocating on pinned file. + By default, the value is ovp_sections, especially, for zoned ufs, the + value is 1. diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 9333a22b9a01..fa27498202a3 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -1724,6 +1724,9 @@ struct f2fs_sb_info { /* for skip statistic */ unsigned long long skipped_gc_rwsem; /* FG_GC only */ =20 + /* free sections reserved for pinned file */ + unsigned int reserved_pin_section; + /* threshold for gc trials on pinned files */ unsigned short gc_pin_file_threshold; struct f2fs_rwsem pin_sem; diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 696131e655ed..a909f79db178 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -1887,9 +1887,8 @@ static int f2fs_expand_inode_data(struct inode *inode= , loff_t offset, } } =20 - if (has_not_enough_free_secs(sbi, 0, f2fs_sb_has_blkzoned(sbi) ? - ZONED_PIN_SEC_REQUIRED_COUNT : - GET_SEC_FROM_SEG(sbi, overprovision_segments(sbi)))) { + if (has_not_enough_free_secs(sbi, 0, + sbi->reserved_pin_section)) { f2fs_down_write(&sbi->gc_lock); stat_inc_gc_call_count(sbi, FOREGROUND); err =3D f2fs_gc(sbi, &gc_control); diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index 57adeff5ef25..48b97a95fd63 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -4975,6 +4975,9 @@ static int f2fs_fill_super(struct super_block *sb, st= ruct fs_context *fc) sbi->last_valid_block_count =3D sbi->total_valid_block_count; sbi->reserved_blocks =3D 0; sbi->current_reserved_blocks =3D 0; + sbi->reserved_pin_section =3D f2fs_sb_has_blkzoned(sbi) ? + ZONED_PIN_SEC_REQUIRED_COUNT : + GET_SEC_FROM_SEG(sbi, overprovision_segments(sbi)); limit_reserve_root(sbi); adjust_unusable_cap_perc(sbi); =20 diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c index 75134d69a0bd..51be7ffb38c5 100644 --- a/fs/f2fs/sysfs.c +++ b/fs/f2fs/sysfs.c @@ -824,6 +824,13 @@ static ssize_t __sbi_store(struct f2fs_attr *a, return count; } =20 + if (!strcmp(a->attr.name, "reserved_pin_section")) { + if (t > GET_SEC_FROM_SEG(sbi, overprovision_segments(sbi))) + return -EINVAL; + *ui =3D (unsigned int)t; + return count; + } + *ui =3D (unsigned int)t; =20 return count; @@ -1130,6 +1137,7 @@ F2FS_SBI_GENERAL_RO_ATTR(unusable_blocks_per_sec); F2FS_SBI_GENERAL_RW_ATTR(blkzone_alloc_policy); #endif F2FS_SBI_GENERAL_RW_ATTR(carve_out); +F2FS_SBI_GENERAL_RW_ATTR(reserved_pin_section); =20 /* STAT_INFO ATTR */ #ifdef CONFIG_F2FS_STAT_FS @@ -1323,6 +1331,7 @@ static struct attribute *f2fs_attrs[] =3D { ATTR_LIST(last_age_weight), ATTR_LIST(max_read_extent_count), ATTR_LIST(carve_out), + ATTR_LIST(reserved_pin_section), NULL, }; ATTRIBUTE_GROUPS(f2fs); --=20 2.40.1