c52475712e
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
346 lines
10 KiB
Diff
346 lines
10 KiB
Diff
From: Alexander Duyck <alexander.h.duyck@redhat.com>
|
|
Date: Wed, 31 Dec 2014 10:56:31 -0800
|
|
Subject: [PATCH] fib_trie: Move resize to after inflate/halve
|
|
|
|
This change consists of a cut/paste of resize to behind inflate and halve
|
|
so that I could remove the two function prototypes.
|
|
|
|
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
|
|
@@ -149,8 +149,6 @@ struct trie {
|
|
static void tnode_put_child_reorg(struct tnode *tn, unsigned long i,
|
|
struct tnode *n, int wasfull);
|
|
static struct tnode *resize(struct trie *t, struct tnode *tn);
|
|
-static struct tnode *inflate(struct trie *t, struct tnode *tn);
|
|
-static struct tnode *halve(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;
|
|
@@ -447,161 +445,6 @@ static void put_child_root(struct tnode
|
|
rcu_assign_pointer(t->trie, n);
|
|
}
|
|
|
|
-#define MAX_WORK 10
|
|
-static struct tnode *resize(struct trie *t, struct tnode *tn)
|
|
-{
|
|
- struct tnode *old_tn, *n = NULL;
|
|
- int inflate_threshold_use;
|
|
- int halve_threshold_use;
|
|
- int max_work;
|
|
-
|
|
- if (!tn)
|
|
- return NULL;
|
|
-
|
|
- pr_debug("In tnode_resize %p inflate_threshold=%d threshold=%d\n",
|
|
- tn, inflate_threshold, halve_threshold);
|
|
-
|
|
- /* No children */
|
|
- if (tn->empty_children > (tnode_child_length(tn) - 1))
|
|
- goto no_children;
|
|
-
|
|
- /* One child */
|
|
- if (tn->empty_children == (tnode_child_length(tn) - 1))
|
|
- goto one_child;
|
|
- /*
|
|
- * Double as long as the resulting node has a number of
|
|
- * nonempty nodes that are above the threshold.
|
|
- */
|
|
-
|
|
- /*
|
|
- * From "Implementing a dynamic compressed trie" by Stefan Nilsson of
|
|
- * the Helsinki University of Technology and Matti Tikkanen of Nokia
|
|
- * Telecommunications, page 6:
|
|
- * "A node is doubled if the ratio of non-empty children to all
|
|
- * children in the *doubled* node is at least 'high'."
|
|
- *
|
|
- * 'high' in this instance is the variable 'inflate_threshold'. It
|
|
- * is expressed as a percentage, so we multiply it with
|
|
- * tnode_child_length() and instead of multiplying by 2 (since the
|
|
- * child array will be doubled by inflate()) and multiplying
|
|
- * the left-hand side by 100 (to handle the percentage thing) we
|
|
- * multiply the left-hand side by 50.
|
|
- *
|
|
- * The left-hand side may look a bit weird: tnode_child_length(tn)
|
|
- * - tn->empty_children is of course the number of non-null children
|
|
- * in the current node. tn->full_children is the number of "full"
|
|
- * children, that is non-null tnodes with a skip value of 0.
|
|
- * All of those will be doubled in the resulting inflated tnode, so
|
|
- * we just count them one extra time here.
|
|
- *
|
|
- * A clearer way to write this would be:
|
|
- *
|
|
- * to_be_doubled = tn->full_children;
|
|
- * not_to_be_doubled = tnode_child_length(tn) - tn->empty_children -
|
|
- * tn->full_children;
|
|
- *
|
|
- * new_child_length = tnode_child_length(tn) * 2;
|
|
- *
|
|
- * new_fill_factor = 100 * (not_to_be_doubled + 2*to_be_doubled) /
|
|
- * new_child_length;
|
|
- * if (new_fill_factor >= inflate_threshold)
|
|
- *
|
|
- * ...and so on, tho it would mess up the while () loop.
|
|
- *
|
|
- * anyway,
|
|
- * 100 * (not_to_be_doubled + 2*to_be_doubled) / new_child_length >=
|
|
- * inflate_threshold
|
|
- *
|
|
- * avoid a division:
|
|
- * 100 * (not_to_be_doubled + 2*to_be_doubled) >=
|
|
- * inflate_threshold * new_child_length
|
|
- *
|
|
- * expand not_to_be_doubled and to_be_doubled, and shorten:
|
|
- * 100 * (tnode_child_length(tn) - tn->empty_children +
|
|
- * tn->full_children) >= inflate_threshold * new_child_length
|
|
- *
|
|
- * expand new_child_length:
|
|
- * 100 * (tnode_child_length(tn) - tn->empty_children +
|
|
- * tn->full_children) >=
|
|
- * inflate_threshold * tnode_child_length(tn) * 2
|
|
- *
|
|
- * shorten again:
|
|
- * 50 * (tn->full_children + tnode_child_length(tn) -
|
|
- * tn->empty_children) >= inflate_threshold *
|
|
- * tnode_child_length(tn)
|
|
- *
|
|
- */
|
|
-
|
|
- /* Keep root node larger */
|
|
-
|
|
- if (!node_parent(tn)) {
|
|
- inflate_threshold_use = inflate_threshold_root;
|
|
- halve_threshold_use = halve_threshold_root;
|
|
- } else {
|
|
- inflate_threshold_use = inflate_threshold;
|
|
- halve_threshold_use = halve_threshold;
|
|
- }
|
|
-
|
|
- max_work = MAX_WORK;
|
|
- while ((tn->full_children > 0 && max_work-- &&
|
|
- 50 * (tn->full_children + tnode_child_length(tn)
|
|
- - tn->empty_children)
|
|
- >= inflate_threshold_use * tnode_child_length(tn))) {
|
|
-
|
|
- old_tn = tn;
|
|
- tn = inflate(t, tn);
|
|
-
|
|
- if (IS_ERR(tn)) {
|
|
- tn = old_tn;
|
|
-#ifdef CONFIG_IP_FIB_TRIE_STATS
|
|
- this_cpu_inc(t->stats->resize_node_skipped);
|
|
-#endif
|
|
- break;
|
|
- }
|
|
- }
|
|
-
|
|
- /* Return if at least one inflate is run */
|
|
- if (max_work != MAX_WORK)
|
|
- return tn;
|
|
-
|
|
- /*
|
|
- * Halve as long as the number of empty children in this
|
|
- * node is above threshold.
|
|
- */
|
|
-
|
|
- max_work = MAX_WORK;
|
|
- while (tn->bits > 1 && max_work-- &&
|
|
- 100 * (tnode_child_length(tn) - tn->empty_children) <
|
|
- halve_threshold_use * tnode_child_length(tn)) {
|
|
-
|
|
- old_tn = tn;
|
|
- tn = halve(t, tn);
|
|
- if (IS_ERR(tn)) {
|
|
- tn = old_tn;
|
|
-#ifdef CONFIG_IP_FIB_TRIE_STATS
|
|
- this_cpu_inc(t->stats->resize_node_skipped);
|
|
-#endif
|
|
- break;
|
|
- }
|
|
- }
|
|
-
|
|
-
|
|
- /* Only one child remains */
|
|
- if (tn->empty_children == (tnode_child_length(tn) - 1)) {
|
|
- unsigned long i;
|
|
-one_child:
|
|
- for (i = tnode_child_length(tn); !n && i;)
|
|
- n = tnode_get_child(tn, --i);
|
|
-no_children:
|
|
- /* compress one level */
|
|
- node_set_parent(n, NULL);
|
|
- tnode_free_safe(tn);
|
|
- return n;
|
|
- }
|
|
- return tn;
|
|
-}
|
|
-
|
|
-
|
|
static void tnode_clean_free(struct tnode *tn)
|
|
{
|
|
struct tnode *tofree;
|
|
@@ -804,6 +647,160 @@ nomem:
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
+#define MAX_WORK 10
|
|
+static struct tnode *resize(struct trie *t, struct tnode *tn)
|
|
+{
|
|
+ struct tnode *old_tn, *n = NULL;
|
|
+ int inflate_threshold_use;
|
|
+ int halve_threshold_use;
|
|
+ int max_work;
|
|
+
|
|
+ if (!tn)
|
|
+ return NULL;
|
|
+
|
|
+ pr_debug("In tnode_resize %p inflate_threshold=%d threshold=%d\n",
|
|
+ tn, inflate_threshold, halve_threshold);
|
|
+
|
|
+ /* No children */
|
|
+ if (tn->empty_children > (tnode_child_length(tn) - 1))
|
|
+ goto no_children;
|
|
+
|
|
+ /* One child */
|
|
+ if (tn->empty_children == (tnode_child_length(tn) - 1))
|
|
+ goto one_child;
|
|
+ /*
|
|
+ * Double as long as the resulting node has a number of
|
|
+ * nonempty nodes that are above the threshold.
|
|
+ */
|
|
+
|
|
+ /*
|
|
+ * From "Implementing a dynamic compressed trie" by Stefan Nilsson of
|
|
+ * the Helsinki University of Technology and Matti Tikkanen of Nokia
|
|
+ * Telecommunications, page 6:
|
|
+ * "A node is doubled if the ratio of non-empty children to all
|
|
+ * children in the *doubled* node is at least 'high'."
|
|
+ *
|
|
+ * 'high' in this instance is the variable 'inflate_threshold'. It
|
|
+ * is expressed as a percentage, so we multiply it with
|
|
+ * tnode_child_length() and instead of multiplying by 2 (since the
|
|
+ * child array will be doubled by inflate()) and multiplying
|
|
+ * the left-hand side by 100 (to handle the percentage thing) we
|
|
+ * multiply the left-hand side by 50.
|
|
+ *
|
|
+ * The left-hand side may look a bit weird: tnode_child_length(tn)
|
|
+ * - tn->empty_children is of course the number of non-null children
|
|
+ * in the current node. tn->full_children is the number of "full"
|
|
+ * children, that is non-null tnodes with a skip value of 0.
|
|
+ * All of those will be doubled in the resulting inflated tnode, so
|
|
+ * we just count them one extra time here.
|
|
+ *
|
|
+ * A clearer way to write this would be:
|
|
+ *
|
|
+ * to_be_doubled = tn->full_children;
|
|
+ * not_to_be_doubled = tnode_child_length(tn) - tn->empty_children -
|
|
+ * tn->full_children;
|
|
+ *
|
|
+ * new_child_length = tnode_child_length(tn) * 2;
|
|
+ *
|
|
+ * new_fill_factor = 100 * (not_to_be_doubled + 2*to_be_doubled) /
|
|
+ * new_child_length;
|
|
+ * if (new_fill_factor >= inflate_threshold)
|
|
+ *
|
|
+ * ...and so on, tho it would mess up the while () loop.
|
|
+ *
|
|
+ * anyway,
|
|
+ * 100 * (not_to_be_doubled + 2*to_be_doubled) / new_child_length >=
|
|
+ * inflate_threshold
|
|
+ *
|
|
+ * avoid a division:
|
|
+ * 100 * (not_to_be_doubled + 2*to_be_doubled) >=
|
|
+ * inflate_threshold * new_child_length
|
|
+ *
|
|
+ * expand not_to_be_doubled and to_be_doubled, and shorten:
|
|
+ * 100 * (tnode_child_length(tn) - tn->empty_children +
|
|
+ * tn->full_children) >= inflate_threshold * new_child_length
|
|
+ *
|
|
+ * expand new_child_length:
|
|
+ * 100 * (tnode_child_length(tn) - tn->empty_children +
|
|
+ * tn->full_children) >=
|
|
+ * inflate_threshold * tnode_child_length(tn) * 2
|
|
+ *
|
|
+ * shorten again:
|
|
+ * 50 * (tn->full_children + tnode_child_length(tn) -
|
|
+ * tn->empty_children) >= inflate_threshold *
|
|
+ * tnode_child_length(tn)
|
|
+ *
|
|
+ */
|
|
+
|
|
+ /* Keep root node larger */
|
|
+
|
|
+ if (!node_parent(tn)) {
|
|
+ inflate_threshold_use = inflate_threshold_root;
|
|
+ halve_threshold_use = halve_threshold_root;
|
|
+ } else {
|
|
+ inflate_threshold_use = inflate_threshold;
|
|
+ halve_threshold_use = halve_threshold;
|
|
+ }
|
|
+
|
|
+ max_work = MAX_WORK;
|
|
+ while ((tn->full_children > 0 && max_work-- &&
|
|
+ 50 * (tn->full_children + tnode_child_length(tn)
|
|
+ - tn->empty_children)
|
|
+ >= inflate_threshold_use * tnode_child_length(tn))) {
|
|
+
|
|
+ old_tn = tn;
|
|
+ tn = inflate(t, tn);
|
|
+
|
|
+ if (IS_ERR(tn)) {
|
|
+ tn = old_tn;
|
|
+#ifdef CONFIG_IP_FIB_TRIE_STATS
|
|
+ this_cpu_inc(t->stats->resize_node_skipped);
|
|
+#endif
|
|
+ break;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ /* Return if at least one inflate is run */
|
|
+ if (max_work != MAX_WORK)
|
|
+ return tn;
|
|
+
|
|
+ /*
|
|
+ * Halve as long as the number of empty children in this
|
|
+ * node is above threshold.
|
|
+ */
|
|
+
|
|
+ max_work = MAX_WORK;
|
|
+ while (tn->bits > 1 && max_work-- &&
|
|
+ 100 * (tnode_child_length(tn) - tn->empty_children) <
|
|
+ halve_threshold_use * tnode_child_length(tn)) {
|
|
+
|
|
+ old_tn = tn;
|
|
+ tn = halve(t, tn);
|
|
+ if (IS_ERR(tn)) {
|
|
+ tn = old_tn;
|
|
+#ifdef CONFIG_IP_FIB_TRIE_STATS
|
|
+ this_cpu_inc(t->stats->resize_node_skipped);
|
|
+#endif
|
|
+ break;
|
|
+ }
|
|
+ }
|
|
+
|
|
+
|
|
+ /* Only one child remains */
|
|
+ if (tn->empty_children == (tnode_child_length(tn) - 1)) {
|
|
+ unsigned long i;
|
|
+one_child:
|
|
+ for (i = tnode_child_length(tn); !n && i;)
|
|
+ n = tnode_get_child(tn, --i);
|
|
+no_children:
|
|
+ /* compress one level */
|
|
+ node_set_parent(n, NULL);
|
|
+ tnode_free_safe(tn);
|
|
+ return n;
|
|
+ }
|
|
+ return tn;
|
|
+}
|
|
+
|
|
/* readside must use rcu_read_lock currently dump routines
|
|
via get_fa_head and dump */
|
|
|