Because kzalloc() is used,
the allocation size of pipe_inode_info is fixex at 192bytes,
but it's only use 144bytes per each.
We can use kmem_cache_zalloc() to reduce some dynamic allocation size.
Signed-off-by: Kyeongdon Kim <[email protected]>
---
fs/pipe.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/fs/pipe.c b/fs/pipe.c
index 7194683..3054816 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -47,6 +47,9 @@
*/
#define PIPE_MIN_DEF_BUFFERS 2
+/* SLAB cache for pipe inode */
+static struct kmem_cache *pipe_inode_cachep;
+
/*
* The max size that a non-root user is allowed to grow the pipe. Can
* be set by root in /proc/sys/fs/pipe-max-size
@@ -786,7 +789,7 @@ struct pipe_inode_info *alloc_pipe_info(void)
unsigned long user_bufs;
unsigned int max_size = READ_ONCE(pipe_max_size);
- pipe = kzalloc(sizeof(struct pipe_inode_info), GFP_KERNEL_ACCOUNT);
+ pipe = kmem_cache_zalloc(pipe_inode_cachep, GFP_KERNEL_ACCOUNT);
if (pipe == NULL)
goto out_free_uid;
@@ -820,7 +823,7 @@ struct pipe_inode_info *alloc_pipe_info(void)
out_revert_acct:
(void) account_pipe_buffers(user, pipe_bufs, 0);
- kfree(pipe);
+ kmem_cache_free(pipe_inode_cachep, pipe);
out_free_uid:
free_uid(user);
return NULL;
@@ -847,7 +850,7 @@ void free_pipe_info(struct pipe_inode_info *pipe)
if (pipe->tmp_page)
__free_page(pipe->tmp_page);
kvfree(pipe->bufs);
- kfree(pipe);
+ kmem_cache_free(pipe_inode_cachep, pipe);
}
static struct vfsmount *pipe_mnt __read_mostly;
@@ -1496,6 +1499,9 @@ static int __init init_pipe_fs(void)
#ifdef CONFIG_SYSCTL
register_sysctl_init("fs", fs_pipe_sysctls);
#endif
+ pipe_inode_cachep = kmem_cache_create("pipe_inode",
+ sizeof(struct pipe_inode_info),
+ 0, SLAB_PANIC, NULL);
return err;
}
--
2.10.2