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ipv4: Fix inflate_threshold_root automatically 

During large updates there could be triggered warnings like: "Fix
inflate_threshold_root. Now=25 size=11 bits" if inflate() of the root
node isn't finished in 10 loops. It should be much rarer now, after
changing the threshold from 15 to 25, and a temporary problem, so
this patch tries to handle it automatically using a fix variable to
increase by one inflate threshold for next root resizes (up to the 35
limit, max fix = 10). The fix variable is decreased when root's
inflate() finishes below 7 loops (even if some other, smaller table/
trie is updated -- for simplicity the fix variable is global for now).

Reported-by: Pawel Staszewski <pstaszewski@itcare.pl>
Reported-by: Jorge Boncompte [DTI2] <jorge@dti2.net>
Tested-by: Pawel Staszewski <pstaszewski@itcare.pl>
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: Robert Olsson <robert.olsson@its.uu.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Jarek Poplawski 2009-07-14 09:41:00 +00:00 committed by David S. Miller
parent c3059477fc
commit be916cdebe
1 changed files with 22 additions and 7 deletions
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29
net/ipv4/fib_trie.c
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@ -327,6 +327,8 @@ static const int inflate_threshold = 50;
static const int halve_threshold_root = 15;
static const int inflate_threshold_root = 25;
static int inflate_threshold_root_fix;
#define INFLATE_FIX_MAX 10 /* a comment in resize() */
static void __alias_free_mem(struct rcu_head *head)
{
@ -617,7 +619,8 @@ static struct node *resize(struct trie *t, struct tnode *tn)
/* Keep root node larger */
if (!tn->parent)
inflate_threshold_use = inflate_threshold_root;
inflate_threshold_use = inflate_threshold_root +
inflate_threshold_root_fix;
else
inflate_threshold_use = inflate_threshold;
@ -641,15 +644,27 @@ static struct node *resize(struct trie *t, struct tnode *tn)
}
if (max_resize < 0) {
if (!tn->parent)
pr_warning("Fix inflate_threshold_root."
" Now=%d size=%d bits\n",
inflate_threshold_root, tn->bits);
else
if (!tn->parent) {
/*
* It was observed that during large updates even
* inflate_threshold_root = 35 might be needed to avoid
* this warning; but it should be temporary, so let's
* try to handle this automatically.
*/
if (inflate_threshold_root_fix < INFLATE_FIX_MAX)
inflate_threshold_root_fix++;
else
pr_warning("Fix inflate_threshold_root."
" Now=%d size=%d bits fix=%d\n",
inflate_threshold_root, tn->bits,
inflate_threshold_root_fix);
} else {
pr_warning("Fix inflate_threshold."
" Now=%d size=%d bits\n",
inflate_threshold, tn->bits);
}
}
} else if (max_resize > 3 && !tn->parent && inflate_threshold_root_fix)
inflate_threshold_root_fix--;
check_tnode(tn);