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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 <dada1@cosmosbay.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric Dumazet
2005-10-30 15:02:16 -08:00
committed by Linus Torvalds
parent 503af334ec
commit 2f51201662
8 changed files with 21 additions and 15 deletions
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fs/dquot.c
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@@ -662,7 +662,7 @@ static void add_dquot_ref(struct super_block *sb, int type)
restart:
file_list_lock();
list_for_each(p, &sb->s_files) {
struct file *filp = list_entry(p, struct file, f_list);
struct file *filp = list_entry(p, struct file, f_u.fu_list);
struct inode *inode = filp->f_dentry->d_inode;
if (filp->f_mode & FMODE_WRITE && dqinit_needed(inode, type)) {
struct dentry *dentry = dget(filp->f_dentry);