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author | Jeff Layton <jlayton@redhat.com> | 2013-06-21 12:58:22 (GMT) |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2013-07-08 09:36:42 (GMT) |
commit | 7012b02a2b2c42bb1e1d95040a6e3bb59c7284f7 (patch) | |
tree | 6a1c54cdca608ad75db6282cc4c0c7a6bb5f7673 /fs/ncpfs/inode.c | |
parent | 0bc77381c1b1600e659eb7322c39d1753615722d (diff) | |
download | linux-fsl-qoriq-7012b02a2b2c42bb1e1d95040a6e3bb59c7284f7.tar.xz |
locks: move file_lock_list to a set of percpu hlist_heads and convert file_lock_lock to an lglock
The file_lock_list is only used for /proc/locks. The vastly common case
is for locks to be put onto the list and come off again, without ever
being traversed.
Help optimize for this use-case by moving to percpu hlist_head-s. At the
same time, we can make the locking less contentious by moving to an
lglock. When iterating over the lists for /proc/locks, we must take the
global lock and then iterate over each CPU's list in turn.
This change necessitates a new fl_link_cpu field to keep track of which
CPU the entry is on. On x86_64 at least, this field is placed within an
existing hole in the struct to avoid growing the size.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Acked-by: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/ncpfs/inode.c')
0 files changed, 0 insertions, 0 deletions