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ceph: optimize memory usage

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In current code, regular file and directory use same struct
ceph_file_info to store fs specific data so the struct has to
include some fields which are only used for directory
(e.g., readdir related info), when having plenty of regular files,
it will lead to memory waste.

This patch introduces dedicated ceph_dir_file_info cache for
readdir related thins. So that regular file does not include those
unused fields anymore.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Chengguang Xu
2018-03-13 10:42:44 +08:00
committed by Ilya Dryomov
parent 47474d0b01
commit bb48bd4dc4
5 changed files with 169 additions and 117 deletions
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8
fs/ceph/super.c
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@@ -679,6 +679,7 @@ struct kmem_cache *ceph_cap_cachep;
struct kmem_cache *ceph_cap_flush_cachep;
struct kmem_cache *ceph_dentry_cachep;
struct kmem_cache *ceph_file_cachep;
struct kmem_cache *ceph_dir_file_cachep;
static void ceph_inode_init_once(void *foo)
{
@@ -715,6 +716,10 @@ static int __init init_caches(void)
if (!ceph_file_cachep)
goto bad_file;
ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
if (!ceph_dir_file_cachep)
goto bad_dir_file;
error = ceph_fscache_register();
if (error)
goto bad_fscache;
@@ -722,6 +727,8 @@ static int __init init_caches(void)
return 0;
bad_fscache:
kmem_cache_destroy(ceph_dir_file_cachep);
bad_dir_file:
kmem_cache_destroy(ceph_file_cachep);
bad_file:
kmem_cache_destroy(ceph_dentry_cachep);
@@ -747,6 +754,7 @@ static void destroy_caches(void)
kmem_cache_destroy(ceph_cap_flush_cachep);
kmem_cache_destroy(ceph_dentry_cachep);
kmem_cache_destroy(ceph_file_cachep);
kmem_cache_destroy(ceph_dir_file_cachep);
ceph_fscache_unregister();
}