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authorSangwoo <sangwoo2.park@lge.com>2015-10-21 17:44:30 -0400
committerPaul Moore <pmoore@redhat.com>2015-10-21 17:44:30 -0400
commit63205654c0e05e5ffa1c6eef2fbef21dcabd2185 (patch)
tree52f244ee4d88b385b1bf5fd038818a383557c8c1 /security
parent1d2a168a085f1c65b895f258ee11a52813d25af6 (diff)
downloadlinux-linaro-stable-63205654c0e05e5ffa1c6eef2fbef21dcabd2185.tar.gz
selinux: Use a kmem_cache for allocation struct file_security_struct
The size of struct file_security_struct is 16byte at my setup. But, the real allocation size for per each file_security_struct is 64bytes in my setup that kmalloc min size is 64bytes because ARCH_DMA_MINALIGN is 64. This allocation is called every times at file allocation(alloc_file()). So, the total slack memory size(allocated size - request size) is increased exponentially. E.g) Min Kmalloc Size : 64bytes, Unit : bytes Allocated Size | Request Size | Slack Size | Allocation Count --------------------------------------------------------------- 770048 | 192512 | 577536 | 12032 At the result, this change reduce memory usage 42bytes per each file_security_struct Signed-off-by: Sangwoo <sangwoo2.park@lge.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> [PM: removed extra subject prefix] Signed-off-by: Paul Moore <pmoore@redhat.com>
Diffstat (limited to 'security')
-rw-r--r--security/selinux/hooks.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 799d15aa35f9..305399225010 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -126,6 +126,7 @@ int selinux_enabled = 1;
#endif
static struct kmem_cache *sel_inode_cache;
+static struct kmem_cache *file_security_cache;
/**
* selinux_secmark_enabled - Check to see if SECMARK is currently enabled
@@ -287,7 +288,7 @@ static int file_alloc_security(struct file *file)
struct file_security_struct *fsec;
u32 sid = current_sid();
- fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL);
+ fsec = kmem_cache_zalloc(file_security_cache, GFP_KERNEL);
if (!fsec)
return -ENOMEM;
@@ -302,7 +303,7 @@ static void file_free_security(struct file *file)
{
struct file_security_struct *fsec = file->f_security;
file->f_security = NULL;
- kfree(fsec);
+ kmem_cache_free(file_security_cache, fsec);
}
static int superblock_alloc_security(struct super_block *sb)
@@ -6086,6 +6087,9 @@ static __init int selinux_init(void)
sel_inode_cache = kmem_cache_create("selinux_inode_security",
sizeof(struct inode_security_struct),
0, SLAB_PANIC, NULL);
+ file_security_cache = kmem_cache_create("selinux_file_security",
+ sizeof(struct file_security_struct),
+ 0, SLAB_PANIC, NULL);
avc_init();
security_add_hooks(selinux_hooks, ARRAY_SIZE(selinux_hooks));