On Fri, Aug 30, 2013 at 03:52:49PM -0400, Waiman Long wrote: > So it is the mnput_no_expire() function that is doing all the > lg_global_lock() calls. Interesting... So you are getting a lot of mntput() with ->mnt_ns being NULL? I wonder which type it is... Note that anything mounted will have non-NULL ->mnt_ns until umount and anything obtained via kern_mount/kern_mount_data will also have a non-NULL ->mnt_ns - until kern_unmount(). Could you try to gather stats of that sort? Normally that path should be only hit by fput() when we have a lazy-unmounted fs and close an opened file on it... I see one potential stupidity in that area (simple_pin_fs() ought to set ->mnt_ns, with simple_release_fs() clearing it), but there's not a lot of fs types that would use the damn thing... -- 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
