From: Theodore Ts'o Subject: [PATCH] ext4: remove /proc tuning knobs Date: Sat, 28 Feb 2009 22:48:08 -0500 Message-ID: <1235879288-26201-2-git-send-email-tytso@mit.edu> References: <1235879288-26201-1-git-send-email-tytso@mit.edu> Cc: Theodore Ts'o To: Ext4 Developers List Return-path: Received: from thunk.org ([69.25.196.29]:49412 "EHLO thunker.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754922AbZCADsN (ORCPT ); Sat, 28 Feb 2009 22:48:13 -0500 In-Reply-To: <1235879288-26201-1-git-send-email-tytso@mit.edu> Sender: linux-ext4-owner@vger.kernel.org List-ID: Remove tuning knobs in /proc/fs/ext4//*. Signed-off-by: "Theodore Ts'o" --- fs/ext4/ext4.h | 16 ------- fs/ext4/inode.c | 7 +--- fs/ext4/mballoc.c | 117 +++++++++++++---------------------------------------- fs/ext4/super.c | 46 --------------------- 4 files changed, 30 insertions(+), 156 deletions(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 5621eb0..2c165fa 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -975,22 +975,6 @@ void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr, extern struct proc_dir_entry *ext4_proc_root; -#ifdef CONFIG_PROC_FS -extern const struct file_operations ext4_ui_proc_fops; - -#define EXT4_PROC_HANDLER(name, var) \ -do { \ - proc = proc_create_data(name, mode, sbi->s_proc, \ - &ext4_ui_proc_fops, &sbi->s_##var); \ - if (proc == NULL) { \ - printk(KERN_ERR "EXT4-fs: can't create %s\n", name); \ - goto err_out; \ - } \ -} while (0) -#else -#define EXT4_PROC_HANDLER(name, var) -#endif - /* * Function prototypes */ diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 8815b9c..b8e3412 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4124,12 +4124,7 @@ make_io: unsigned num; table = ext4_inode_table(sb, gdp); - /* Make sure s_inode_readahead_blks is a power of 2 */ - while (EXT4_SB(sb)->s_inode_readahead_blks & - (EXT4_SB(sb)->s_inode_readahead_blks-1)) - EXT4_SB(sb)->s_inode_readahead_blks = - (EXT4_SB(sb)->s_inode_readahead_blks & - (EXT4_SB(sb)->s_inode_readahead_blks-1)); + /* s_inode_readahead_blks is always a power of 2 */ b = block & ~(EXT4_SB(sb)->s_inode_readahead_blks-1); if (table > b) b = table; diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index 0430143..7e729cb 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -46,22 +46,23 @@ * The allocation request involve request for multiple number of blocks * near to the goal(block) value specified. * - * During initialization phase of the allocator we decide to use the group - * preallocation or inode preallocation depending on the size file. The - * size of the file could be the resulting file size we would have after - * allocation or the current file size which ever is larger. If the size is - * less that sbi->s_mb_stream_request we select the group - * preallocation. The default value of s_mb_stream_request is 16 - * blocks. This can also be tuned via - * /proc/fs/ext4//stream_req. The value is represented in terms - * of number of blocks. + * During initialization phase of the allocator we decide to use the + * group preallocation or inode preallocation depending on the size of + * the file. The size of the file could be the resulting file size we + * would have after allocation, or the current file size, which ever + * is larger. If the size is less than sbi->s_mb_stream_request we + * select to use the group preallocation. The default value of + * s_mb_stream_request is 16 blocks. This can also be tuned via + * /sys/fs/ext4//mb_stream_req. The value is represented in + * terms of number of blocks. * * The main motivation for having small file use group preallocation is to - * ensure that we have small file closer in the disk. + * ensure that we have small files closer together on the disk. * - * First stage the allocator looks at the inode prealloc list - * ext4_inode_info->i_prealloc_list contain list of prealloc spaces for - * this particular inode. The inode prealloc space is represented as: + * First stage the allocator looks at the inode prealloc list, + * ext4_inode_info->i_prealloc_list, which contains list of prealloc + * spaces for this particular inode. The inode prealloc space is + * represented as: * * pa_lstart -> the logical start block for this prealloc space * pa_pstart -> the physical start block for this prealloc space @@ -121,29 +122,29 @@ * list. In case of inode preallocation we follow a list of heuristics * based on file size. This can be found in ext4_mb_normalize_request. If * we are doing a group prealloc we try to normalize the request to - * sbi->s_mb_group_prealloc. Default value of s_mb_group_prealloc is set to + * sbi->s_mb_group_prealloc. Default value of s_mb_group_prealloc is * 512 blocks. This can be tuned via - * /proc/fs/ext4/ option the group prealloc request is normalized to the * stripe value (sbi->s_stripe) * - * The regular allocator(using the buddy cache) support few tunables. + * The regular allocator(using the buddy cache) supports few tunables. * - * /proc/fs/ext4//min_to_scan - * /proc/fs/ext4//max_to_scan - * /proc/fs/ext4//order2_req + * /sys/fs/ext4//mb_min_to_scan + * /sys/fs/ext4//mb_max_to_scan + * /sys/fs/ext4//mb_order2_req * - * The regular allocator use buddy scan only if the request len is power of + * The regular allocator uses buddy scan only if the request len is power of * 2 blocks and the order of allocation is >= sbi->s_mb_order2_reqs. The * value of s_mb_order2_reqs can be tuned via - * /proc/fs/ext4//order2_req. If the request len is equal to + * /sys/fs/ext4//mb_order2_req. If the request len is equal to * stripe size (sbi->s_stripe), we try to search for contigous block in - * stripe size. This should result in better allocation on RAID setup. If - * not we search in the specific group using bitmap for best extents. The - * tunable min_to_scan and max_to_scan controll the behaviour here. + * stripe size. This should result in better allocation on RAID setups. If + * not, we search in the specific group using bitmap for best extents. The + * tunable min_to_scan and max_to_scan control the behaviour here. * min_to_scan indicate how long the mballoc __must__ look for a best - * extent and max_to_scanindicate how long the mballoc __can__ look for a + * extent and max_to_scan indicates how long the mballoc __can__ look for a * best extent in the found extents. Searching for the blocks starts with * the group specified as the goal value in allocation context via * ac_g_ex. Each group is first checked based on the criteria whether it @@ -337,8 +338,6 @@ static void ext4_mb_generate_from_pa(struct super_block *sb, void *bitmap, ext4_group_t group); static void ext4_mb_generate_from_freelist(struct super_block *sb, void *bitmap, ext4_group_t group); -static int ext4_mb_init_per_dev_proc(struct super_block *sb); -static int ext4_mb_destroy_per_dev_proc(struct super_block *sb); static void release_blocks_on_commit(journal_t *journal, transaction_t *txn); @@ -1978,7 +1977,7 @@ ext4_mb_regular_allocator(struct ext4_allocation_context *ac) /* * We search using buddy data only if the order of the request * is greater than equal to the sbi_s_mb_order2_reqs - * You can tune it via /proc/fs/ext4//order2_req + * You can tune it via /sys/fs/ext4//mb_order2_req */ if (i >= sbi->s_mb_order2_reqs) { /* @@ -2753,7 +2752,6 @@ int ext4_mb_init(struct super_block *sb, int needs_recovery) spin_lock_init(&lg->lg_prealloc_lock); } - ext4_mb_init_per_dev_proc(sb); ext4_mb_history_init(sb); if (sbi->s_journal) @@ -2836,7 +2834,6 @@ int ext4_mb_release(struct super_block *sb) free_percpu(sbi->s_locality_groups); ext4_mb_history_release(sb); - ext4_mb_destroy_per_dev_proc(sb); return 0; } @@ -2897,62 +2894,6 @@ static void release_blocks_on_commit(journal_t *journal, transaction_t *txn) mb_debug("freed %u blocks in %u structures\n", count, count2); } -#define EXT4_MB_STATS_NAME "stats" -#define EXT4_MB_MAX_TO_SCAN_NAME "max_to_scan" -#define EXT4_MB_MIN_TO_SCAN_NAME "min_to_scan" -#define EXT4_MB_ORDER2_REQ "order2_req" -#define EXT4_MB_STREAM_REQ "stream_req" -#define EXT4_MB_GROUP_PREALLOC "group_prealloc" - -static int ext4_mb_init_per_dev_proc(struct super_block *sb) -{ -#ifdef CONFIG_PROC_FS - mode_t mode = S_IFREG | S_IRUGO | S_IWUSR; - struct ext4_sb_info *sbi = EXT4_SB(sb); - struct proc_dir_entry *proc; - - if (sbi->s_proc == NULL) - return -EINVAL; - - EXT4_PROC_HANDLER(EXT4_MB_STATS_NAME, mb_stats); - EXT4_PROC_HANDLER(EXT4_MB_MAX_TO_SCAN_NAME, mb_max_to_scan); - EXT4_PROC_HANDLER(EXT4_MB_MIN_TO_SCAN_NAME, mb_min_to_scan); - EXT4_PROC_HANDLER(EXT4_MB_ORDER2_REQ, mb_order2_reqs); - EXT4_PROC_HANDLER(EXT4_MB_STREAM_REQ, mb_stream_request); - EXT4_PROC_HANDLER(EXT4_MB_GROUP_PREALLOC, mb_group_prealloc); - return 0; - -err_out: - remove_proc_entry(EXT4_MB_GROUP_PREALLOC, sbi->s_proc); - remove_proc_entry(EXT4_MB_STREAM_REQ, sbi->s_proc); - remove_proc_entry(EXT4_MB_ORDER2_REQ, sbi->s_proc); - remove_proc_entry(EXT4_MB_MIN_TO_SCAN_NAME, sbi->s_proc); - remove_proc_entry(EXT4_MB_MAX_TO_SCAN_NAME, sbi->s_proc); - remove_proc_entry(EXT4_MB_STATS_NAME, sbi->s_proc); - return -ENOMEM; -#else - return 0; -#endif -} - -static int ext4_mb_destroy_per_dev_proc(struct super_block *sb) -{ -#ifdef CONFIG_PROC_FS - struct ext4_sb_info *sbi = EXT4_SB(sb); - - if (sbi->s_proc == NULL) - return -EINVAL; - - remove_proc_entry(EXT4_MB_GROUP_PREALLOC, sbi->s_proc); - remove_proc_entry(EXT4_MB_STREAM_REQ, sbi->s_proc); - remove_proc_entry(EXT4_MB_ORDER2_REQ, sbi->s_proc); - remove_proc_entry(EXT4_MB_MIN_TO_SCAN_NAME, sbi->s_proc); - remove_proc_entry(EXT4_MB_MAX_TO_SCAN_NAME, sbi->s_proc); - remove_proc_entry(EXT4_MB_STATS_NAME, sbi->s_proc); -#endif - return 0; -} - int __init init_ext4_mballoc(void) { ext4_pspace_cachep = @@ -3120,7 +3061,7 @@ out_err: * here we normalize request for locality group * Group request are normalized to s_strip size if we set the same via mount * option. If not we set it to s_mb_group_prealloc which can be configured via - * /proc/fs/ext4//group_prealloc + * /sys/fs/ext4//mb_group_prealloc * * XXX: should we try to preallocate more than the group has now? */ @@ -4231,7 +4172,7 @@ static inline void ext4_mb_show_ac(struct ext4_allocation_context *ac) * file is determined by the current size or the resulting size after * allocation which ever is larger * - * One can tune this size via /proc/fs/ext4//stream_req + * One can tune this size via /sys/fs/ext4//mb_stream_req */ static void ext4_mb_group_or_file(struct ext4_allocation_context *ac) { diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 4257613..904bbab 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -579,7 +579,6 @@ static void ext4_put_super(struct super_block *sb) ext4_commit_super(sb, es, 1); } if (sbi->s_proc) { - remove_proc_entry("inode_readahead_blks", sbi->s_proc); remove_proc_entry(sb->s_id, ext4_proc_root); } kobject_put(&sbi->s_kobj); @@ -2518,11 +2517,6 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent) #ifdef CONFIG_PROC_FS if (ext4_proc_root) sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root); - - if (sbi->s_proc) - proc_create_data("inode_readahead_blks", 0644, sbi->s_proc, - &ext4_ui_proc_fops, - &sbi->s_inode_readahead_blks); #endif bgl_lock_init(sbi->s_blockgroup_lock); @@ -2821,7 +2815,6 @@ failed_mount2: kfree(sbi->s_group_desc); failed_mount: if (sbi->s_proc) { - remove_proc_entry("inode_readahead_blks", sbi->s_proc); remove_proc_entry(sb->s_id, ext4_proc_root); } #ifdef CONFIG_QUOTA @@ -3892,45 +3885,6 @@ static int ext4_get_sb(struct file_system_type *fs_type, return get_sb_bdev(fs_type, flags, dev_name, data, ext4_fill_super, mnt); } -#ifdef CONFIG_PROC_FS -static int ext4_ui_proc_show(struct seq_file *m, void *v) -{ - unsigned int *p = m->private; - - seq_printf(m, "%u\n", *p); - return 0; -} - -static int ext4_ui_proc_open(struct inode *inode, struct file *file) -{ - return single_open(file, ext4_ui_proc_show, PDE(inode)->data); -} - -static ssize_t ext4_ui_proc_write(struct file *file, const char __user *buf, - size_t cnt, loff_t *ppos) -{ - unsigned long *p = PDE(file->f_path.dentry->d_inode)->data; - char str[32]; - - if (cnt >= sizeof(str)) - return -EINVAL; - if (copy_from_user(str, buf, cnt)) - return -EFAULT; - - *p = simple_strtoul(str, NULL, 0); - return cnt; -} - -const struct file_operations ext4_ui_proc_fops = { - .owner = THIS_MODULE, - .open = ext4_ui_proc_open, - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, - .write = ext4_ui_proc_write, -}; -#endif