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f2fs: use kmem_cache pool during inline xattr lookups

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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 <qkrwngud825@gmail.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2020-02-25 18:17:10 +08:00 committed by Jaegeuk Kim
parent dabfbbc8f9
commit a999150f4f
4 changed files with 65 additions and 6 deletions
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3
fs/f2fs/f2fs.h
View File

@ -1487,6 +1487,9 @@ 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 {

10
fs/f2fs/super.c
View File

@ -1202,6 +1202,7 @@ 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++)
@ -3458,12 +3459,17 @@ try_onemore:
}
}
/* 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);
@ -3736,6 +3742,8 @@ free_meta_inode:
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:

54
fs/f2fs/xattr.c
View File

@ -23,6 +23,25 @@
#include "xattr.h"
#include "segment.h"
static void *xattr_alloc(struct f2fs_sb_info *sbi, int size, bool *is_inline)
{
if (likely(size == sbi->inline_xattr_slab_size)) {
*is_inline = true;
return kmem_cache_zalloc(sbi->inline_xattr_slab, GFP_NOFS);
}
*is_inline = false;
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 @@ check:
*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;
}
@ -764,3 +785,26 @@ 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);
}

4
fs/f2fs/xattr.h
View File

@ -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) { }
#endif
#ifdef CONFIG_F2FS_FS_SECURITY