mir/ovs
2
0
Fork 0
mirror of https://github.com/openvswitch/ovs synced 2025-08-31 14:25:26 +00:00
Code Issues Releases Wiki Activity

hmap: Improve debug log message when reporting unusually large buckets.

Browse Source 
I was seeing a lot of these messages, including a lot of them suppressed
by rate-limiting, and I wondered whether any really big messages were
being suppressed.  By reporting the largest bucket, instead of just every
large bucket, it becomes more likely that the truly too-large buckets get
reported.

(The problem I saw was a false alarm.)

Acked-by: Han Zhou <hzhou8@ebay.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
This commit is contained in:
Ben Pfaff
2019-03-26 09:58:20 -07:00
parent 51f518b983
commit 6a7bceaac3
1 changed files with 24 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
lib/hmap.c
View File

@@ -1,5 +1,5 @@
/*
* Copyright (c) 2008, 2009, 2010, 2012, 2013, 2015 Nicira, Inc.
* Copyright (c) 2008, 2009, 2010, 2012, 2013, 2015, 2019 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -103,6 +103,9 @@ resize(struct hmap *hmap, size_t new_mask, const char *where)
tmp.buckets[i] = NULL;
}
}
int n_big_buckets = 0;
int biggest_count = 0;
int n_biggest_buckets = 0;
for (i = 0; i <= hmap->mask; i++) {
struct hmap_node *node, *next;
int count = 0;
@@ -112,14 +115,30 @@ resize(struct hmap *hmap, size_t new_mask, const char *where)
count++;
}
if (count > 5) {
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 10);
COVERAGE_INC(hmap_pathological);
VLOG_DBG_RL(&rl, "%s: %d nodes in bucket (%"PRIuSIZE" nodes, %"PRIuSIZE" buckets)",
where, count, hmap->n, hmap->mask + 1);
n_big_buckets++;
if (count > biggest_count) {
biggest_count = count;
n_biggest_buckets = 1;
} else if (count == biggest_count) {
n_biggest_buckets++;
}
}
}
hmap_swap(hmap, &tmp);
hmap_destroy(&tmp);
if (n_big_buckets) {
static struct vlog_rate_limit rl = VLOG_RATE_LIMIT_INIT(10, 10);
COVERAGE_INC(hmap_pathological);
VLOG_DBG_RL(&rl, "%s: %d bucket%s with 6+ nodes, "
"including %d bucket%s with %d nodes "
"(%"PRIuSIZE" nodes total across %"PRIuSIZE" buckets)",
where,
n_big_buckets, n_big_buckets > 1 ? "s" : "",
n_biggest_buckets, n_biggest_buckets > 1 ? "s" : "",
biggest_count,
hmap->n, hmap->mask + 1);
}
}
static size_t