linux

iv/linux

History

Waiman Long a767f680e3 SELinux: Increase ebitmap_node size for 64-bit configuration

Currently, the ebitmap_node structure has a fixed size of 32 bytes. On
a 32-bit system, the overhead is 8 bytes, leaving 24 bytes for being
used as bitmaps. The overhead ratio is 1/4.

On a 64-bit system, the overhead is 16 bytes. Therefore, only 16 bytes
are left for bitmap purpose and the overhead ratio is 1/2. With a
3.8.2 kernel, a boot-up operation will cause the ebitmap_get_bit()
function to be called about 9 million times. The average number of
ebitmap_node traversal is about 3.7.

This patch increases the size of the ebitmap_node structure to 64
bytes for 64-bit system to keep the overhead ratio at 1/4. This may
also improve performance a little bit by making node to node traversal
less frequent (< 2) as more bits are available in each node.

Signed-off-by: Waiman Long <Waiman.Long@hp.com>
Acked-by:  Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <pmoore@redhat.com>
Signed-off-by: Eric Paris <eparis@redhat.com>

2013-07-25 13:02:31 -04:00

include

selinux: remove the BUG_ON() from selinux_skb_xfrm_sid()

2013-07-25 13:02:13 -04:00

SELinux: Increase ebitmap_node size for 64-bit configuration

2013-07-25 13:02:31 -04:00

.gitignore

SELinux: add .gitignore files for dynamic classes

2009-10-24 09:42:27 +08:00

avc.c

hlist: drop the node parameter from iterators

2013-02-27 19:10:24 -08:00