mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 21:40:53 +07:00
18a82eb9f9
As spotted by kmemtrace, struct ext2_sb_info is 17024 bytes on 64-bit which makes it a very bad fit for SLAB allocators. The culprit of the wasted memory is ->s_blockgroup_lock which can be as big as 16 KB when NR_CPUS >= 32. To fix that, allocate ->s_blockgroup_lock, which fits nicely in a order 2 page in the worst case, separately. This shinks down struct ext2_sb_info enough to fit a 1 KB slab cache so now we allocate 16 KB + 1 KB instead of 32 KB saving 15 KB of memory. Acked-by: Andreas Dilger <adilger@sun.com> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Cc: <linux-ext4@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
118 lines
3.7 KiB
C
118 lines
3.7 KiB
C
/*
|
|
* linux/include/linux/ext2_fs_sb.h
|
|
*
|
|
* Copyright (C) 1992, 1993, 1994, 1995
|
|
* Remy Card (card@masi.ibp.fr)
|
|
* Laboratoire MASI - Institut Blaise Pascal
|
|
* Universite Pierre et Marie Curie (Paris VI)
|
|
*
|
|
* from
|
|
*
|
|
* linux/include/linux/minix_fs_sb.h
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*/
|
|
|
|
#ifndef _LINUX_EXT2_FS_SB
|
|
#define _LINUX_EXT2_FS_SB
|
|
|
|
#include <linux/blockgroup_lock.h>
|
|
#include <linux/percpu_counter.h>
|
|
#include <linux/rbtree.h>
|
|
|
|
/* XXX Here for now... not interested in restructing headers JUST now */
|
|
|
|
/* data type for block offset of block group */
|
|
typedef int ext2_grpblk_t;
|
|
|
|
/* data type for filesystem-wide blocks number */
|
|
typedef unsigned long ext2_fsblk_t;
|
|
|
|
#define E2FSBLK "%lu"
|
|
|
|
struct ext2_reserve_window {
|
|
ext2_fsblk_t _rsv_start; /* First byte reserved */
|
|
ext2_fsblk_t _rsv_end; /* Last byte reserved or 0 */
|
|
};
|
|
|
|
struct ext2_reserve_window_node {
|
|
struct rb_node rsv_node;
|
|
__u32 rsv_goal_size;
|
|
__u32 rsv_alloc_hit;
|
|
struct ext2_reserve_window rsv_window;
|
|
};
|
|
|
|
struct ext2_block_alloc_info {
|
|
/* information about reservation window */
|
|
struct ext2_reserve_window_node rsv_window_node;
|
|
/*
|
|
* was i_next_alloc_block in ext2_inode_info
|
|
* is the logical (file-relative) number of the
|
|
* most-recently-allocated block in this file.
|
|
* We use this for detecting linearly ascending allocation requests.
|
|
*/
|
|
__u32 last_alloc_logical_block;
|
|
/*
|
|
* Was i_next_alloc_goal in ext2_inode_info
|
|
* is the *physical* companion to i_next_alloc_block.
|
|
* it the the physical block number of the block which was most-recentl
|
|
* allocated to this file. This give us the goal (target) for the next
|
|
* allocation when we detect linearly ascending requests.
|
|
*/
|
|
ext2_fsblk_t last_alloc_physical_block;
|
|
};
|
|
|
|
#define rsv_start rsv_window._rsv_start
|
|
#define rsv_end rsv_window._rsv_end
|
|
|
|
/*
|
|
* second extended-fs super-block data in memory
|
|
*/
|
|
struct ext2_sb_info {
|
|
unsigned long s_frag_size; /* Size of a fragment in bytes */
|
|
unsigned long s_frags_per_block;/* Number of fragments per block */
|
|
unsigned long s_inodes_per_block;/* Number of inodes per block */
|
|
unsigned long s_frags_per_group;/* Number of fragments in a group */
|
|
unsigned long s_blocks_per_group;/* Number of blocks in a group */
|
|
unsigned long s_inodes_per_group;/* Number of inodes in a group */
|
|
unsigned long s_itb_per_group; /* Number of inode table blocks per group */
|
|
unsigned long s_gdb_count; /* Number of group descriptor blocks */
|
|
unsigned long s_desc_per_block; /* Number of group descriptors per block */
|
|
unsigned long s_groups_count; /* Number of groups in the fs */
|
|
unsigned long s_overhead_last; /* Last calculated overhead */
|
|
unsigned long s_blocks_last; /* Last seen block count */
|
|
struct buffer_head * s_sbh; /* Buffer containing the super block */
|
|
struct ext2_super_block * s_es; /* Pointer to the super block in the buffer */
|
|
struct buffer_head ** s_group_desc;
|
|
unsigned long s_mount_opt;
|
|
unsigned long s_sb_block;
|
|
uid_t s_resuid;
|
|
gid_t s_resgid;
|
|
unsigned short s_mount_state;
|
|
unsigned short s_pad;
|
|
int s_addr_per_block_bits;
|
|
int s_desc_per_block_bits;
|
|
int s_inode_size;
|
|
int s_first_ino;
|
|
spinlock_t s_next_gen_lock;
|
|
u32 s_next_generation;
|
|
unsigned long s_dir_count;
|
|
u8 *s_debts;
|
|
struct percpu_counter s_freeblocks_counter;
|
|
struct percpu_counter s_freeinodes_counter;
|
|
struct percpu_counter s_dirs_counter;
|
|
struct blockgroup_lock *s_blockgroup_lock;
|
|
/* root of the per fs reservation window tree */
|
|
spinlock_t s_rsv_window_lock;
|
|
struct rb_root s_rsv_window_root;
|
|
struct ext2_reserve_window_node s_rsv_window_head;
|
|
};
|
|
|
|
static inline spinlock_t *
|
|
sb_bgl_lock(struct ext2_sb_info *sbi, unsigned int block_group)
|
|
{
|
|
return bgl_lock_ptr(sbi->s_blockgroup_lock, block_group);
|
|
}
|
|
|
|
#endif /* _LINUX_EXT2_FS_SB */
|