提交 83b7b44e 编写于 作者: E Eric Dumazet 提交者: Linus Torvalds

[PATCH] fs: reorder some 'struct inode' fields to speedup i_size manipulations

On 32bits SMP platforms, 64bits i_size is protected by a seqcount
(i_size_seqcount).

When i_size is read or written, i_size_seqcount is read/written as well, so
it make sense to group these two fields together in the same cache line.

This patch moves i_size_seqcount next to i_size, and also moves i_version
to let offsetof(struct inode, i_size) being 0x40 instead of 0x3c (for
32bits platforms).

For 64 bits platforms, i_size_seqcount doesnt exist, and the move of a
'long i_version' should not introduce a new hole because of padding.
Signed-off-by: NEric Dumazet <dada1@cosmosbay.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
上级 ea82c740
......@@ -548,12 +548,15 @@ struct inode {
uid_t i_uid;
gid_t i_gid;
dev_t i_rdev;
unsigned long i_version;
loff_t i_size;
#ifdef __NEED_I_SIZE_ORDERED
seqcount_t i_size_seqcount;
#endif
struct timespec i_atime;
struct timespec i_mtime;
struct timespec i_ctime;
unsigned int i_blkbits;
unsigned long i_version;
blkcnt_t i_blocks;
unsigned short i_bytes;
spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
......@@ -598,9 +601,6 @@ struct inode {
void *i_security;
#endif
void *i_private; /* fs or device private pointer */
#ifdef __NEED_I_SIZE_ORDERED
seqcount_t i_size_seqcount;
#endif
};
/*
......
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