From 76f7ba35d4b5219fcc4cb072134c020ec77d030d Mon Sep 17 00:00:00 2001 From: Eric Paris Date: Fri, 2 Jan 2009 17:40:06 -0500 Subject: SELinux: shrink sizeof av_inhert selinux_class_perm and context I started playing with pahole today and decided to put it against the selinux structures. Found we could save a little bit of space on x86_64 (and no harm on i686) just reorganizing some structs. Object size changes: av_inherit: 24 -> 16 selinux_class_perm: 48 -> 40 context: 80 -> 72 Admittedly there aren't many of av_inherit or selinux_class_perm's in the kernel (33 and 1 respectively) But the change to the size of struct context reverberate out a bit. I can get some hard number if they are needed, but I don't see why they would be. We do change which cacheline context->len and context->str would be on, but I don't see that as a problem since we are clearly going to have to load both if the context is to be of any value. I've run with the patch and don't seem to be having any problems. An example of what's going on using struct av_inherit would be: form: to: struct av_inherit { struct av_inherit { u16 tclass; const char **common_pts; const char **common_pts; u32 common_base; u32 common_base; u16 tclass; }; (notice all I did was move u16 tclass to the end of the struct instead of the beginning) Memory layout before the change: struct av_inherit { u16 tclass; /* 2 */ /* 6 bytes hole */ const char** common_pts; /* 8 */ u32 common_base; /* 4 */ /* 4 byes padding */ /* size: 24, cachelines: 1 */ /* sum members: 14, holes: 1, sum holes: 6 */ /* padding: 4 */ }; Memory layout after the change: struct av_inherit { const char ** common_pts; /* 8 */ u32 common_base; /* 4 */ u16 tclass; /* 2 */ /* 2 bytes padding */ /* size: 16, cachelines: 1 */ /* sum members: 14, holes: 0, sum holes: 0 */ /* padding: 2 */ }; Signed-off-by: Eric Paris Signed-off-by: James Morris --- security/selinux/include/avc_ss.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'security/selinux/include/avc_ss.h') diff --git a/security/selinux/include/avc_ss.h b/security/selinux/include/avc_ss.h index c0d314d9f8e..bb1ec801bdf 100644 --- a/security/selinux/include/avc_ss.h +++ b/security/selinux/include/avc_ss.h @@ -17,16 +17,16 @@ struct av_perm_to_string { }; struct av_inherit { - u16 tclass; const char **common_pts; u32 common_base; + u16 tclass; }; struct selinux_class_perm { const struct av_perm_to_string *av_perm_to_string; u32 av_pts_len; - const char **class_to_string; u32 cts_len; + const char **class_to_string; const struct av_inherit *av_inherit; u32 av_inherit_len; }; -- cgit v1.2.3-18-g5258