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| author | Sangwoo <sangwoo2.park@lge.com> | 2015-10-21 17:44:30 -0400 |
|---|---|---|
| committer | Paul Moore <pmoore@redhat.com> | 2015-10-21 17:44:30 -0400 |
| commit | 63205654c0e05e5ffa1c6eef2fbef21dcabd2185 (patch) | |
| tree | 52f244ee4d88b385b1bf5fd038818a383557c8c1 | |
| parent | 1d2a168a085f1c65b895f258ee11a52813d25af6 (diff) | |
| download | linux-63205654c0e05e5ffa1c6eef2fbef21dcabd2185.tar.bz2 | |
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>
| -rw-r--r-- | security/selinux/hooks.c | 8 |
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)); |