• Tim Chen's avatar
    VFS : mount lock scalability for internal mounts · 423e0ab0
    Tim Chen authored
    For a number of file systems that don't have a mount point (e.g. sockfs
    and pipefs), they are not marked as long term. Therefore in
    mntput_no_expire, all locks in vfs_mount lock are taken instead of just
    local cpu's lock to aggregate reference counts when we release
    reference to file objects.  In fact, only local lock need to have been
    taken to update ref counts as these file systems are in no danger of
    going away until we are ready to unregister them.
    The attached patch marks file systems using kern_mount without
    mount point as long term.  The contentions of vfs_mount lock
    is now eliminated.  Before un-registering such file system,
    kern_unmount should be called to remove the long term flag and
    make the mount point ready to be freed.
    Signed-off-by: default avatarTim Chen <tim.c.chen@linux.intel.com>
    Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
anon_inodes.c 6.35 KB