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[PATCH] reduce sizeof(struct file)

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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 <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Eric Dumazet 2005-10-30 15:02:16 -08:00 • committed by Linus Torvalds
commit 2f51201662
8 changed files with 21 additions and 15 deletions
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2
fs/super.c
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@ -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;
}