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authorEric Dumazet <dada1@cosmosbay.com>2005-10-30 18:02:16 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-30 20:37:19 -0500
commit2f51201662b28dbf8c15fb7eb972bc51c6cc3fa5 (patch)
tree96826df796058560bc5dd1f7d8d476c5a741d7bc /fs/dquot.c
parent503af334ecf23b9d65d2ff0cc759f3a0bf338290 (diff)
[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/dquot.c')
-rw-r--r--fs/dquot.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/dquot.c b/fs/dquot.c
index 05f3327d64a3..ea7644227a65 100644
--- a/fs/dquot.c
+++ b/fs/dquot.c
@@ -662,7 +662,7 @@ static void add_dquot_ref(struct super_block *sb, int type)
662restart: 662restart:
663 file_list_lock(); 663 file_list_lock();
664 list_for_each(p, &sb->s_files) { 664 list_for_each(p, &sb->s_files) {
665 struct file *filp = list_entry(p, struct file, f_list); 665 struct file *filp = list_entry(p, struct file, f_u.fu_list);
666 struct inode *inode = filp->f_dentry->d_inode; 666 struct inode *inode = filp->f_dentry->d_inode;
667 if (filp->f_mode & FMODE_WRITE && dqinit_needed(inode, type)) { 667 if (filp->f_mode & FMODE_WRITE && dqinit_needed(inode, type)) {
668 struct dentry *dentry = dget(filp->f_dentry); 668 struct dentry *dentry = dget(filp->f_dentry);