diff options
| -rw-r--r-- | include/linux/mount.h | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/include/linux/mount.h b/include/linux/mount.h index 1b7e178..dab69af 100644 --- a/include/linux/mount.h +++ b/include/linux/mount.h @@ -43,9 +43,8 @@ struct vfsmount { struct super_block *mnt_sb; /* pointer to superblock */ struct list_head mnt_mounts; /* list of children, anchored here */ struct list_head mnt_child; /* and going through their mnt_child */ - atomic_t mnt_count; int mnt_flags; - int mnt_expiry_mark; /* true if marked for expiry */ + /* 4 bytes hole on 64bits arches */ char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ struct list_head mnt_list; struct list_head mnt_expire; /* link in fs-specific expiry list */ @@ -54,6 +53,13 @@ struct vfsmount { struct list_head mnt_slave; /* slave list entry */ struct vfsmount *mnt_master; /* slave is on master->mnt_slave_list */ struct mnt_namespace *mnt_ns; /* containing namespace */ + /* + * We put mnt_count & mnt_expiry_mark at the end of struct vfsmount + * to let these frequently modified fields in a separate cache line + * (so that reads of mnt_flags wont ping-pong on SMP machines) + */ + atomic_t mnt_count; + int mnt_expiry_mark; /* true if marked for expiry */ int mnt_pinned; }; |
