This is a note to let you know that I've just added the patch titled
fib_trie: Drop unnecessary calls to leaf_pull_suffix
to the 4.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fib_trie-drop-unnecessary-calls-to-leaf_pull_suffix.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Sat Sep 26 11:13:07 PDT 2015
From: Alexander Duyck <alexander.h.duyck@xxxxxxxxxx>
Date: Mon, 27 Jul 2015 13:08:06 -0700
Subject: fib_trie: Drop unnecessary calls to leaf_pull_suffix
From: Alexander Duyck <alexander.h.duyck@xxxxxxxxxx>
[ Upstream commit 1513069edcf8dd86cfd8d5daef482b97d6b93df6 ]
It was reported that update_suffix was taking a long time on systems where
a large number of leaves were attached to a single node. As it turns out
fib_table_flush was calling update_suffix for each leaf that didn't have all
of the aliases stripped from it. As a result, on this large node removing
one leaf would result in us calling update_suffix for every other leaf on
the node.
The fix is to just remove the calls to leaf_pull_suffix since they are
redundant as we already have a call in resize that will go through and
update the suffix length for the node before we exit out of
fib_table_flush or fib_table_flush_external.
Reported-by: David Ahern <dsa@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Alexander Duyck <alexander.h.duyck@xxxxxxxxxx>
Tested-by: David Ahern <dsa@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv4/fib_trie.c | 4 ----
1 file changed, 4 deletions(-)
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1780,8 +1780,6 @@ void fib_table_flush_external(struct fib
if (hlist_empty(&n->leaf)) {
put_child_root(pn, n->key, NULL);
node_free(n);
- } else {
- leaf_pull_suffix(pn, n);
}
}
}
@@ -1852,8 +1850,6 @@ int fib_table_flush(struct fib_table *tb
if (hlist_empty(&n->leaf)) {
put_child_root(pn, n->key, NULL);
node_free(n);
- } else {
- leaf_pull_suffix(pn, n);
}
}
Patches currently in stable-queue which might be from alexander.h.duyck@xxxxxxxxxx are
queue-4.1/ipv4-off-by-one-in-continuation-handling-in-proc-net-route.patch
queue-4.1/fib_trie-drop-unnecessary-calls-to-leaf_pull_suffix.patch
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