Messages in this thread | | | From | (Eric W. Biederman) | Date | Fri, 24 Apr 2009 22:35:10 -0700 | Subject | Re: [patch 01/27] fs: cleanup files_lock |
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npiggin@suse.de writes:
> Lock tty_files with tty_mutex, provide helpers to manipulate the per-sb > files list, and unexport the files_lock spinlock.
This conflicts a bit with some of my ongoing work, which is generalizing the file list to make it more useful and makes the tty case much less of a special case.
Do you know if the performance improvement would be anywhere near as good if file_list and file_list_lock becoming per inode?
Do you have any idea what the performance improvement with changing the file_list_lock is?
> Index: linux-2.6/fs/open.c > =================================================================== > --- linux-2.6.orig/fs/open.c > +++ linux-2.6/fs/open.c > @@ -828,7 +828,7 @@ static struct file *__dentry_open(struct > f->f_path.mnt = mnt; > f->f_pos = 0; > f->f_op = fops_get(inode->i_fop); > - file_move(f, &inode->i_sb->s_files); > + file_sb_list_add(f, inode->i_sb);
You can make this just: if (!special_file(inode->i_mode)) file_add(f, &inode->i_files);
And save yourself a lot of complexity.
Eric
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