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| author | Eric Dumazet <dada1@cosmosbay.com> | 2005-10-30 15:02:16 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-10-30 17:37:19 -0800 |
| commit | 2f51201662b28dbf8c15fb7eb972bc51c6cc3fa5 (patch) | |
| tree | 96826df796058560bc5dd1f7d8d476c5a741d7bc /fs/super.c | |
| parent | 503af334ecf23b9d65d2ff0cc759f3a0bf338290 (diff) | |
| download | lwn-2f51201662b28dbf8c15fb7eb972bc51c6cc3fa5.tar.gz lwn-2f51201662b28dbf8c15fb7eb972bc51c6cc3fa5.zip | |
[PATCH] reduce sizeof(struct file)
Now that RCU applied on 'struct file' seems stable, we can place f_rcuhead
in a memory location that is not anymore used at call_rcu(&f->f_rcuhead,
file_free_rcu) time, to reduce the size of this critical kernel object.
The trick I used is to move f_rcuhead and f_list in an union called f_u
The callers are changed so that f_rcuhead becomes f_u.fu_rcuhead and f_list
becomes f_u.f_list
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/super.c')
| -rw-r--r-- | fs/super.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/super.c b/fs/super.c index 6e57ee252e14..f60155ec7780 100644 --- a/fs/super.c +++ b/fs/super.c @@ -513,7 +513,7 @@ static void mark_files_ro(struct super_block *sb) struct file *f; file_list_lock(); - list_for_each_entry(f, &sb->s_files, f_list) { + list_for_each_entry(f, &sb->s_files, f_u.fu_list) { if (S_ISREG(f->f_dentry->d_inode->i_mode) && file_count(f)) f->f_mode &= ~FMODE_WRITE; } |