mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-20 14:13:16 +00:00
17afb853ee
also refresh generic patches for 3.14, 3.18, 3.19 and 4.0 targets might need a minor refresh as well, however, it looks like everything still applies cleanly with occasional small offsets. Signed-off-by: Daniel Golle <daniel@makrotopia.org> SVN-Revision: 44876
238 lines
5.5 KiB
Diff
238 lines
5.5 KiB
Diff
From: Alexander Duyck <alexander.h.duyck@redhat.com>
|
|
Date: Wed, 31 Dec 2014 10:56:49 -0800
|
|
Subject: [PATCH] fib_trie: Push tnode flushing down to inflate/halve
|
|
|
|
This change pushes the tnode freeing down into the inflate and halve
|
|
functions. It makes more sense here as we have a better grasp of what is
|
|
going on and when a given cluster of nodes is ready to be freed.
|
|
|
|
I believe this may address a bug in the freeing logic as well. For some
|
|
reason if the freelist got to a certain size we would call
|
|
synchronize_rcu(). I'm assuming that what they meant to do is call
|
|
synchronize_rcu() after they had handed off that much memory via
|
|
call_rcu(). As such that is what I have updated the behavior to be.
|
|
|
|
Signed-off-by: Alexander Duyck <alexander.h.duyck@redhat.com>
|
|
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
---
|
|
|
|
--- a/net/ipv4/fib_trie.c
|
|
+++ b/net/ipv4/fib_trie.c
|
|
@@ -147,8 +147,6 @@ struct trie {
|
|
};
|
|
|
|
static void resize(struct trie *t, struct tnode *tn);
|
|
-/* tnodes to free after resize(); protected by RTNL */
|
|
-static struct callback_head *tnode_free_head;
|
|
static size_t tnode_free_size;
|
|
|
|
/*
|
|
@@ -307,32 +305,6 @@ static struct tnode *tnode_alloc(size_t
|
|
return vzalloc(size);
|
|
}
|
|
|
|
-static void tnode_free_safe(struct tnode *tn)
|
|
-{
|
|
- BUG_ON(IS_LEAF(tn));
|
|
- tn->rcu.next = tnode_free_head;
|
|
- tnode_free_head = &tn->rcu;
|
|
-}
|
|
-
|
|
-static void tnode_free_flush(void)
|
|
-{
|
|
- struct callback_head *head;
|
|
-
|
|
- while ((head = tnode_free_head)) {
|
|
- struct tnode *tn = container_of(head, struct tnode, rcu);
|
|
-
|
|
- tnode_free_head = head->next;
|
|
- tnode_free_size += offsetof(struct tnode, child[1 << tn->bits]);
|
|
-
|
|
- node_free(tn);
|
|
- }
|
|
-
|
|
- if (tnode_free_size >= PAGE_SIZE * sync_pages) {
|
|
- tnode_free_size = 0;
|
|
- synchronize_rcu();
|
|
- }
|
|
-}
|
|
-
|
|
static struct tnode *leaf_new(t_key key)
|
|
{
|
|
struct tnode *l = kmem_cache_alloc(trie_leaf_kmem, GFP_KERNEL);
|
|
@@ -433,17 +405,33 @@ static void put_child_root(struct tnode
|
|
rcu_assign_pointer(t->trie, n);
|
|
}
|
|
|
|
-static void tnode_clean_free(struct tnode *tn)
|
|
+static inline void tnode_free_init(struct tnode *tn)
|
|
{
|
|
- struct tnode *tofree;
|
|
- unsigned long i;
|
|
+ tn->rcu.next = NULL;
|
|
+}
|
|
+
|
|
+static inline void tnode_free_append(struct tnode *tn, struct tnode *n)
|
|
+{
|
|
+ n->rcu.next = tn->rcu.next;
|
|
+ tn->rcu.next = &n->rcu;
|
|
+}
|
|
|
|
- for (i = 0; i < tnode_child_length(tn); i++) {
|
|
- tofree = tnode_get_child(tn, i);
|
|
- if (tofree)
|
|
- node_free(tofree);
|
|
+static void tnode_free(struct tnode *tn)
|
|
+{
|
|
+ struct callback_head *head = &tn->rcu;
|
|
+
|
|
+ while (head) {
|
|
+ head = head->next;
|
|
+ tnode_free_size += offsetof(struct tnode, child[1 << tn->bits]);
|
|
+ node_free(tn);
|
|
+
|
|
+ tn = container_of(head, struct tnode, rcu);
|
|
+ }
|
|
+
|
|
+ if (tnode_free_size >= PAGE_SIZE * sync_pages) {
|
|
+ tnode_free_size = 0;
|
|
+ synchronize_rcu();
|
|
}
|
|
- node_free(tn);
|
|
}
|
|
|
|
static int inflate(struct trie *t, struct tnode *oldtnode)
|
|
@@ -476,20 +464,23 @@ static int inflate(struct trie *t, struc
|
|
inode->bits - 1);
|
|
if (!left)
|
|
goto nomem;
|
|
+ tnode_free_append(tn, left);
|
|
|
|
right = tnode_new(inode->key | m, inode->pos,
|
|
inode->bits - 1);
|
|
|
|
- if (!right) {
|
|
- node_free(left);
|
|
+ if (!right)
|
|
goto nomem;
|
|
- }
|
|
+ tnode_free_append(tn, right);
|
|
|
|
put_child(tn, 2*i, left);
|
|
put_child(tn, 2*i+1, right);
|
|
}
|
|
}
|
|
|
|
+ /* prepare oldtnode to be freed */
|
|
+ tnode_free_init(oldtnode);
|
|
+
|
|
for (i = 0; i < olen; i++) {
|
|
struct tnode *inode = tnode_get_child(oldtnode, i);
|
|
struct tnode *left, *right;
|
|
@@ -505,12 +496,13 @@ static int inflate(struct trie *t, struc
|
|
continue;
|
|
}
|
|
|
|
+ /* drop the node in the old tnode free list */
|
|
+ tnode_free_append(oldtnode, inode);
|
|
+
|
|
/* An internal node with two children */
|
|
if (inode->bits == 1) {
|
|
put_child(tn, 2*i, rtnl_dereference(inode->child[0]));
|
|
put_child(tn, 2*i+1, rtnl_dereference(inode->child[1]));
|
|
-
|
|
- tnode_free_safe(inode);
|
|
continue;
|
|
}
|
|
|
|
@@ -556,17 +548,19 @@ static int inflate(struct trie *t, struc
|
|
put_child(tn, 2 * i, left);
|
|
put_child(tn, 2 * i + 1, right);
|
|
|
|
- tnode_free_safe(inode);
|
|
-
|
|
+ /* resize child nodes */
|
|
resize(t, left);
|
|
resize(t, right);
|
|
}
|
|
|
|
put_child_root(tp, t, tn->key, tn);
|
|
- tnode_free_safe(oldtnode);
|
|
+
|
|
+ /* we completed without error, prepare to free old node */
|
|
+ tnode_free(oldtnode);
|
|
return 0;
|
|
nomem:
|
|
- tnode_clean_free(tn);
|
|
+ /* all pointers should be clean so we are done */
|
|
+ tnode_free(tn);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
@@ -599,17 +593,20 @@ static int halve(struct trie *t, struct
|
|
struct tnode *newn;
|
|
|
|
newn = tnode_new(left->key, oldtnode->pos, 1);
|
|
-
|
|
if (!newn) {
|
|
- tnode_clean_free(tn);
|
|
+ tnode_free(tn);
|
|
return -ENOMEM;
|
|
}
|
|
+ tnode_free_append(tn, newn);
|
|
|
|
put_child(tn, i/2, newn);
|
|
}
|
|
|
|
}
|
|
|
|
+ /* prepare oldtnode to be freed */
|
|
+ tnode_free_init(oldtnode);
|
|
+
|
|
for (i = 0; i < olen; i += 2) {
|
|
struct tnode *newBinNode;
|
|
|
|
@@ -636,11 +633,14 @@ static int halve(struct trie *t, struct
|
|
|
|
put_child(tn, i / 2, newBinNode);
|
|
|
|
+ /* resize child node */
|
|
resize(t, newBinNode);
|
|
}
|
|
|
|
put_child_root(tp, t, tn->key, tn);
|
|
- tnode_free_safe(oldtnode);
|
|
+
|
|
+ /* all pointers should be clean so we are done */
|
|
+ tnode_free(oldtnode);
|
|
|
|
return 0;
|
|
}
|
|
@@ -798,7 +798,8 @@ no_children:
|
|
node_set_parent(n, tp);
|
|
|
|
/* drop dead node */
|
|
- tnode_free_safe(tn);
|
|
+ tnode_free_init(tn);
|
|
+ tnode_free(tn);
|
|
}
|
|
}
|
|
|
|
@@ -884,16 +885,12 @@ static void trie_rebalance(struct trie *
|
|
|
|
while ((tp = node_parent(tn)) != NULL) {
|
|
resize(t, tn);
|
|
-
|
|
- tnode_free_flush();
|
|
tn = tp;
|
|
}
|
|
|
|
/* Handle last (top) tnode */
|
|
if (IS_TNODE(tn))
|
|
resize(t, tn);
|
|
-
|
|
- tnode_free_flush();
|
|
}
|
|
|
|
/* only used from updater-side */
|