On Fri, Jul 22, 2011 at 10:37:58AM -0700, Linus Torvalds wrote: > > From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > Date: Fri, 22 Jul 2011 08:44:51 -0700 > Subject: [PATCH 1/2] VFS: Cut down inode->i_op->xyz accesses in path walking > > One of the biggest remaining unnecessary costs in path walking is the > pointer chasing in inode operations. We already avoided the > dentry->d_op derferences with the DCACHE_OP_xyz flags, this just starts > doing the same thing for the i_op->xyz cases. > + if (unlikely(inode->i_op->lookup)) > + dentry->d_flags |= DCACHE_OP_LOOKUP; > + if (unlikely(inode->i_op->permission)) > + dentry->d_flags |= DCACHE_OP_PERMISSION; > + if (unlikely(inode->i_op->follow_link)) > + dentry->d_flags |= DCACHE_OP_FOLLOW_LINK; I'm not sure about that one... What happens after ln -s foo bar; rm bar; touch bar;? IOW, where do you clean them? Other than that, it needs rebase on top of #for-next - conflicts with ->permission() series. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
