On Wed, 2010-08-04 at 08:21 +0100, Kleen, Andi wrote: > > Issues: > > 1) Compiling fails on a couple of file systems, such like > > CONFIG_ISO9660_FS=y. > > 2) dbenchthreads has about 50% regression. We connect a JBOD of 12 > > disks to > > a machine. Start 4 dbench threads per disk. > > We run the workload under a regular user account. If we run it under > > root account, > > we get 22% improvement instead of regression. > > The root cause is ACL checking. With your patch, do_path_lookup firstly > > goes through > > rcu steps which including a exec permission checking. With ACL, the > > __exec_permission > > always fails. Then a later nameidata_drop_rcu often fails as dentry- > > >d_seq is changed. > > I believe the latest version of Nick's patchkit has a likely fix for that. > > http://git.kernel.org/?p=linux/kernel/git/npiggin/linux-npiggin.git;a=commitdiff;h=9edd35f9aeafc8a5e1688b84cf4488a94898ca45 Thanks Andi. The patch has no ext3 part. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>