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batman-adv: use kmem_cache for translation table 

The translation table (global, local) is usually the part of batman-adv
which has the most dynamical allocated objects. Most of them
(tt_local_entry, tt_global_entry, tt_orig_list_entry, tt_change_node,
tt_req_node, tt_roam_node) are equally sized. So it makes sense to have
them allocated from a kmem_cache for each type.

This approach allowed a small wireless router (TP-Link TL-841NDv8; SLUB
allocator) to store 34% more translation table entries compared to the
current implementation.

[1] https://open-mesh.org/projects/batman-adv/wiki/Kmalloc-kmem-cache-tests

Reported-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
This commit is contained in:
Sven Eckelmann 2016-06-25 16:44:06 +02:00 committed by Simon Wunderlich
parent a65e548131
commit 86452f81d2
3 changed files with 169 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
net/batman-adv/main.c
View File

@ -82,6 +82,12 @@ static void batadv_recv_handler_init(void);
static int __init batadv_init(void)
{
int ret;
ret = batadv_tt_cache_init();
if (ret < 0)
return ret;
INIT_LIST_HEAD(&batadv_hardif_list);
batadv_algo_init();
@ -93,9 +99,8 @@ static int __init batadv_init(void)
batadv_tp_meter_init();
batadv_event_workqueue = create_singlethread_workqueue("bat_events");
if (!batadv_event_workqueue)
return -ENOMEM;
goto err_create_wq;
batadv_socket_init();
batadv_debugfs_init();
@ -108,6 +113,11 @@ static int __init batadv_init(void)
BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION);
return 0;
err_create_wq:
batadv_tt_cache_destroy();
return -ENOMEM;
}
static void __exit batadv_exit(void)
@ -123,6 +133,8 @@ static void __exit batadv_exit(void)
batadv_event_workqueue = NULL;
rcu_barrier();
batadv_tt_cache_destroy();
}
int batadv_mesh_init(struct net_device *soft_iface)

169
net/batman-adv/translation-table.c
View File

@ -22,12 +22,14 @@
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/byteorder/generic.h>
#include <linux/cache.h>
#include <linux/compiler.h>
#include <linux/crc32c.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/fs.h>
#include <linux/if_ether.h>
#include <linux/init.h>
#include <linux/jhash.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
@ -54,6 +56,13 @@
#include "soft-interface.h"
#include "tvlv.h"
static struct kmem_cache *batadv_tl_cache __read_mostly;
static struct kmem_cache *batadv_tg_cache __read_mostly;
static struct kmem_cache *batadv_tt_orig_cache __read_mostly;
static struct kmem_cache *batadv_tt_change_cache __read_mostly;
static struct kmem_cache *batadv_tt_req_cache __read_mostly;
static struct kmem_cache *batadv_tt_roam_cache __read_mostly;
/* hash class keys */
static struct lock_class_key batadv_tt_local_hash_lock_class_key;
static struct lock_class_key batadv_tt_global_hash_lock_class_key;
@ -204,6 +213,20 @@ batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const u8 *addr,
return tt_global_entry;
}
/**
* batadv_tt_local_entry_free_rcu - free the tt_local_entry
* @rcu: rcu pointer of the tt_local_entry
*/
static void batadv_tt_local_entry_free_rcu(struct rcu_head *rcu)
{
struct batadv_tt_local_entry *tt_local_entry;
tt_local_entry = container_of(rcu, struct batadv_tt_local_entry,
common.rcu);
kmem_cache_free(batadv_tl_cache, tt_local_entry);
}
/**
* batadv_tt_local_entry_release - release tt_local_entry from lists and queue
* for free after rcu grace period
@ -218,7 +241,7 @@ static void batadv_tt_local_entry_release(struct kref *ref)
batadv_softif_vlan_put(tt_local_entry->vlan);
kfree_rcu(tt_local_entry, common.rcu);
call_rcu(&tt_local_entry->common.rcu, batadv_tt_local_entry_free_rcu);
}
/**
@ -233,6 +256,20 @@ batadv_tt_local_entry_put(struct batadv_tt_local_entry *tt_local_entry)
batadv_tt_local_entry_release);
}
/**
* batadv_tt_global_entry_free_rcu - free the tt_global_entry
* @rcu: rcu pointer of the tt_global_entry
*/
static void batadv_tt_global_entry_free_rcu(struct rcu_head *rcu)
{
struct batadv_tt_global_entry *tt_global_entry;
tt_global_entry = container_of(rcu, struct batadv_tt_global_entry,
common.rcu);
kmem_cache_free(batadv_tg_cache, tt_global_entry);
}
/**
* batadv_tt_global_entry_release - release tt_global_entry from lists and queue
* for free after rcu grace period
@ -246,7 +283,8 @@ static void batadv_tt_global_entry_release(struct kref *ref)
common.refcount);
batadv_tt_global_del_orig_list(tt_global_entry);
kfree_rcu(tt_global_entry, common.rcu);
call_rcu(&tt_global_entry->common.rcu, batadv_tt_global_entry_free_rcu);
}
/**
@ -383,6 +421,19 @@ static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
batadv_tt_global_size_mod(orig_node, vid, -1);
}
/**
* batadv_tt_orig_list_entry_free_rcu - free the orig_entry
* @rcu: rcu pointer of the orig_entry
*/
static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
{
struct batadv_tt_orig_list_entry *orig_entry;
orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
kmem_cache_free(batadv_tt_orig_cache, orig_entry);
}
/**
* batadv_tt_orig_list_entry_release - release tt orig entry from lists and
* queue for free after rcu grace period
@ -396,7 +447,7 @@ static void batadv_tt_orig_list_entry_release(struct kref *ref)
refcount);
batadv_orig_node_put(orig_entry->orig_node);
kfree_rcu(orig_entry, rcu);
call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
}
/**
@ -426,7 +477,7 @@ static void batadv_tt_local_event(struct batadv_priv *bat_priv,
bool event_removed = false;
bool del_op_requested, del_op_entry;
tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
tt_change_node = kmem_cache_alloc(batadv_tt_change_cache, GFP_ATOMIC);
if (!tt_change_node)
return;
@ -467,8 +518,8 @@ static void batadv_tt_local_event(struct batadv_priv *bat_priv,
continue;
del:
list_del(&entry->list);
kfree(entry);
kfree(tt_change_node);
kmem_cache_free(batadv_tt_change_cache, entry);
kmem_cache_free(batadv_tt_change_cache, tt_change_node);
event_removed = true;
goto unlock;
}
@ -646,7 +697,7 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
goto out;
}
tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
tt_local = kmem_cache_alloc(batadv_tl_cache, GFP_ATOMIC);
if (!tt_local)
goto out;
@ -656,7 +707,7 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const u8 *addr,
net_ratelimited_function(batadv_info, soft_iface,
"adding TT local entry %pM to non-existent VLAN %d\n",
addr, BATADV_PRINT_VID(vid));
kfree(tt_local);
kmem_cache_free(batadv_tl_cache, tt_local);
tt_local = NULL;
goto out;
}
@ -959,7 +1010,7 @@ static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
tt_diff_entries_count++;
}
list_del(&entry->list);
kfree(entry);
kmem_cache_free(batadv_tt_change_cache, entry);
}
spin_unlock_bh(&bat_priv->tt.changes_list_lock);
@ -1259,7 +1310,7 @@ static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
list) {
list_del(&entry->list);
kfree(entry);
kmem_cache_free(batadv_tt_change_cache, entry);
}
atomic_set(&bat_priv->tt.local_changes, 0);
@ -1341,7 +1392,7 @@ batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
goto out;
}
orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
orig_entry = kmem_cache_zalloc(batadv_tt_orig_cache, GFP_ATOMIC);
if (!orig_entry)
goto out;
@ -1411,7 +1462,8 @@ static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
goto out;
if (!tt_global_entry) {
tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
tt_global_entry = kmem_cache_zalloc(batadv_tg_cache,
GFP_ATOMIC);
if (!tt_global_entry)
goto out;
@ -2280,7 +2332,7 @@ static void batadv_tt_req_node_release(struct kref *ref)
tt_req_node = container_of(ref, struct batadv_tt_req_node, refcount);
kfree(tt_req_node);
kmem_cache_free(batadv_tt_req_cache, tt_req_node);
}
/**
@ -2367,7 +2419,7 @@ batadv_tt_req_node_new(struct batadv_priv *bat_priv,
goto unlock;
}
tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
tt_req_node = kmem_cache_alloc(batadv_tt_req_cache, GFP_ATOMIC);
if (!tt_req_node)
goto unlock;
@ -3104,7 +3156,7 @@ static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
list_del(&node->list);
kfree(node);
kmem_cache_free(batadv_tt_roam_cache, node);
}
spin_unlock_bh(&bat_priv->tt.roam_list_lock);
@ -3121,7 +3173,7 @@ static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
continue;
list_del(&node->list);
kfree(node);
kmem_cache_free(batadv_tt_roam_cache, node);
}
spin_unlock_bh(&bat_priv->tt.roam_list_lock);
}
@ -3162,7 +3214,8 @@ static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv, u8 *client)
}
if (!ret) {
tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
tt_roam_node = kmem_cache_alloc(batadv_tt_roam_cache,
GFP_ATOMIC);
if (!tt_roam_node)
goto unlock;
@ -3865,3 +3918,85 @@ bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
return ret;
}
/**
* batadv_tt_cache_init - Initialize tt memory object cache
*
* Return: 0 on success or negative error number in case of failure.
*/
int __init batadv_tt_cache_init(void)
{
size_t tl_size = sizeof(struct batadv_tt_local_entry);
size_t tg_size = sizeof(struct batadv_tt_global_entry);
size_t tt_orig_size = sizeof(struct batadv_tt_orig_list_entry);
size_t tt_change_size = sizeof(struct batadv_tt_change_node);
size_t tt_req_size = sizeof(struct batadv_tt_req_node);
size_t tt_roam_size = sizeof(struct batadv_tt_roam_node);
batadv_tl_cache = kmem_cache_create("batadv_tl_cache", tl_size, 0,
SLAB_HWCACHE_ALIGN, NULL);
if (!batadv_tl_cache)
return -ENOMEM;
batadv_tg_cache = kmem_cache_create("batadv_tg_cache", tg_size, 0,
SLAB_HWCACHE_ALIGN, NULL);
if (!batadv_tg_cache)
goto err_tt_tl_destroy;
batadv_tt_orig_cache = kmem_cache_create("batadv_tt_orig_cache",
tt_orig_size, 0,
SLAB_HWCACHE_ALIGN, NULL);
if (!batadv_tt_orig_cache)
goto err_tt_tg_destroy;
batadv_tt_change_cache = kmem_cache_create("batadv_tt_change_cache",
tt_change_size, 0,
SLAB_HWCACHE_ALIGN, NULL);
if (!batadv_tt_change_cache)
goto err_tt_orig_destroy;
batadv_tt_req_cache = kmem_cache_create("batadv_tt_req_cache",
tt_req_size, 0,
SLAB_HWCACHE_ALIGN, NULL);
if (!batadv_tt_req_cache)
goto err_tt_change_destroy;
batadv_tt_roam_cache = kmem_cache_create("batadv_tt_roam_cache",
tt_roam_size, 0,
SLAB_HWCACHE_ALIGN, NULL);
if (!batadv_tt_roam_cache)
goto err_tt_req_destroy;
return 0;
err_tt_req_destroy:
kmem_cache_destroy(batadv_tt_req_cache);
batadv_tt_req_cache = NULL;
err_tt_change_destroy:
kmem_cache_destroy(batadv_tt_change_cache);
batadv_tt_change_cache = NULL;
err_tt_orig_destroy:
kmem_cache_destroy(batadv_tt_orig_cache);
batadv_tt_orig_cache = NULL;
err_tt_tg_destroy:
kmem_cache_destroy(batadv_tg_cache);
batadv_tg_cache = NULL;
err_tt_tl_destroy:
kmem_cache_destroy(batadv_tl_cache);
batadv_tl_cache = NULL;
return -ENOMEM;
}
/**
* batadv_tt_cache_destroy - Destroy tt memory object cache
*/
void batadv_tt_cache_destroy(void)
{
kmem_cache_destroy(batadv_tl_cache);
kmem_cache_destroy(batadv_tg_cache);
kmem_cache_destroy(batadv_tt_orig_cache);
kmem_cache_destroy(batadv_tt_change_cache);
kmem_cache_destroy(batadv_tt_req_cache);
kmem_cache_destroy(batadv_tt_roam_cache);
}

3
net/batman-adv/translation-table.h
View File

@ -59,4 +59,7 @@ bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
const u8 *addr, unsigned short vid);
int batadv_tt_cache_init(void);
void batadv_tt_cache_destroy(void);
#endif /* _NET_BATMAN_ADV_TRANSLATION_TABLE_H_ */