It's been observed that kzalloc() on lookup_all_xattrs() are called millions of times on Android, quickly becoming the top abuser of slub memory allocator.
Use a dedicated kmem cache pool for xattr lookups to mitigate this. Signed-off-by: Park Ju Hyung <[email protected]> Signed-off-by: Chao Yu <[email protected]> --- Hi, Ju Hyung, Let me know if you have any objection on this patch. :) fs/f2fs/f2fs.h | 3 +++ fs/f2fs/super.c | 10 ++++++++- fs/f2fs/xattr.c | 54 ++++++++++++++++++++++++++++++++++++++++++++----- fs/f2fs/xattr.h | 4 ++++ 4 files changed, 65 insertions(+), 6 deletions(-) diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 12a197e89a3e..23b93a116c73 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -1486,6 +1486,9 @@ struct f2fs_sb_info { __u32 s_chksum_seed; struct workqueue_struct *post_read_wq; /* post read workqueue */ + + struct kmem_cache *inline_xattr_slab; /* inline xattr entry */ + unsigned int inline_xattr_slab_size; /* default inline xattr slab size */ }; struct f2fs_private_dio { diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c index d241e07c0bfa..0b16204d3b7d 100644 --- a/fs/f2fs/super.c +++ b/fs/f2fs/super.c @@ -1201,6 +1201,7 @@ static void f2fs_put_super(struct super_block *sb) kvfree(sbi->raw_super); destroy_device_list(sbi); + f2fs_destroy_xattr_caches(sbi); mempool_destroy(sbi->write_io_dummy); #ifdef CONFIG_QUOTA for (i = 0; i < MAXQUOTAS; i++) @@ -3457,12 +3458,17 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent) } } + /* init per sbi slab cache */ + err = f2fs_init_xattr_caches(sbi); + if (err) + goto free_io_dummy; + /* get an inode for meta space */ sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi)); if (IS_ERR(sbi->meta_inode)) { f2fs_err(sbi, "Failed to read F2FS meta data inode"); err = PTR_ERR(sbi->meta_inode); - goto free_io_dummy; + goto free_xattr_cache; } err = f2fs_get_valid_checkpoint(sbi); @@ -3735,6 +3741,8 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent) make_bad_inode(sbi->meta_inode); iput(sbi->meta_inode); sbi->meta_inode = NULL; +free_xattr_cache: + f2fs_destroy_xattr_caches(sbi); free_io_dummy: mempool_destroy(sbi->write_io_dummy); free_percpu: diff --git a/fs/f2fs/xattr.c b/fs/f2fs/xattr.c index a3360a97e624..e46a10eb0e42 100644 --- a/fs/f2fs/xattr.c +++ b/fs/f2fs/xattr.c @@ -23,6 +23,25 @@ #include "xattr.h" #include "segment.h" +static void *xattr_alloc(struct f2fs_sb_info *sbi, int size, bool *is_inline) +{ + *is_inline = (size == sbi->inline_xattr_slab_size); + + if (*is_inline) + return kmem_cache_zalloc(sbi->inline_xattr_slab, GFP_NOFS); + + return f2fs_kzalloc(sbi, size, GFP_NOFS); +} + +static void xattr_free(struct f2fs_sb_info *sbi, void *xattr_addr, + bool is_inline) +{ + if (is_inline) + kmem_cache_free(sbi->inline_xattr_slab, xattr_addr); + else + kvfree(xattr_addr); +} + static int f2fs_xattr_generic_get(const struct xattr_handler *handler, struct dentry *unused, struct inode *inode, const char *name, void *buffer, size_t size) @@ -301,7 +320,8 @@ static int read_xattr_block(struct inode *inode, void *txattr_addr) static int lookup_all_xattrs(struct inode *inode, struct page *ipage, unsigned int index, unsigned int len, const char *name, struct f2fs_xattr_entry **xe, - void **base_addr, int *base_size) + void **base_addr, int *base_size, + bool *is_inline) { void *cur_addr, *txattr_addr, *last_txattr_addr; void *last_addr = NULL; @@ -313,7 +333,7 @@ static int lookup_all_xattrs(struct inode *inode, struct page *ipage, return -ENODATA; *base_size = XATTR_SIZE(inode) + XATTR_PADDING_SIZE; - txattr_addr = f2fs_kzalloc(F2FS_I_SB(inode), *base_size, GFP_NOFS); + txattr_addr = xattr_alloc(F2FS_I_SB(inode), *base_size, is_inline); if (!txattr_addr) return -ENOMEM; @@ -362,7 +382,7 @@ static int lookup_all_xattrs(struct inode *inode, struct page *ipage, *base_addr = txattr_addr; return 0; out: - kvfree(txattr_addr); + xattr_free(F2FS_I_SB(inode), txattr_addr, *is_inline); return err; } @@ -499,6 +519,7 @@ int f2fs_getxattr(struct inode *inode, int index, const char *name, unsigned int size, len; void *base_addr = NULL; int base_size; + bool is_inline; if (name == NULL) return -EINVAL; @@ -509,7 +530,7 @@ int f2fs_getxattr(struct inode *inode, int index, const char *name, down_read(&F2FS_I(inode)->i_xattr_sem); error = lookup_all_xattrs(inode, ipage, index, len, name, - &entry, &base_addr, &base_size); + &entry, &base_addr, &base_size, &is_inline); up_read(&F2FS_I(inode)->i_xattr_sem); if (error) return error; @@ -532,7 +553,7 @@ int f2fs_getxattr(struct inode *inode, int index, const char *name, } error = size; out: - kvfree(base_addr); + xattr_free(F2FS_I_SB(inode), base_addr, is_inline); return error; } @@ -767,3 +788,26 @@ int f2fs_setxattr(struct inode *inode, int index, const char *name, f2fs_update_time(sbi, REQ_TIME); return err; } + +int f2fs_init_xattr_caches(struct f2fs_sb_info *sbi) +{ + dev_t dev = sbi->sb->s_bdev->bd_dev; + char slab_name[32]; + + sprintf(slab_name, "f2fs_xattr_entry-%u:%u", MAJOR(dev), MINOR(dev)); + + sbi->inline_xattr_slab_size = F2FS_OPTION(sbi).inline_xattr_size * + sizeof(__le32) + XATTR_PADDING_SIZE; + + sbi->inline_xattr_slab = f2fs_kmem_cache_create(slab_name, + sbi->inline_xattr_slab_size); + if (!sbi->inline_xattr_slab) + return -ENOMEM; + + return 0; +} + +void f2fs_destroy_xattr_caches(struct f2fs_sb_info *sbi) +{ + kmem_cache_destroy(sbi->inline_xattr_slab); +} diff --git a/fs/f2fs/xattr.h b/fs/f2fs/xattr.h index 574beea46494..7345dfa7b7a9 100644 --- a/fs/f2fs/xattr.h +++ b/fs/f2fs/xattr.h @@ -131,6 +131,8 @@ extern int f2fs_setxattr(struct inode *, int, const char *, extern int f2fs_getxattr(struct inode *, int, const char *, void *, size_t, struct page *); extern ssize_t f2fs_listxattr(struct dentry *, char *, size_t); +extern int f2fs_init_xattr_caches(struct f2fs_sb_info *); +extern void f2fs_destroy_xattr_caches(struct f2fs_sb_info *); #else #define f2fs_xattr_handlers NULL @@ -151,6 +153,8 @@ static inline ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, { return -EOPNOTSUPP; } +static int f2fs_init_xattr_caches(struct f2fs_sb_info *sbi) { return 0; } +static void f2fs_destroy_xattr_caches(struct f2fs_sb_info *sbi) { return 0; } #endif #ifdef CONFIG_F2FS_FS_SECURITY -- 2.18.0.rc1 _______________________________________________ Linux-f2fs-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
