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coverage: Time out the coverage hash suppression once a day.

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Otherwise coverage log messages will eventually get rotated out of the
system logs and never reappear (before restarting a given daemon).

Bug #1452.
Signed-off-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Ben Pfaff
2012-02-06 10:21:59 -08:00
parent 96f900fac6
commit 380cbf3802
1 changed files with 11 additions and 2 deletions
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13
lib/coverage.c
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2009, 2010, 2011 Nicira Networks.
* Copyright (c) 2009, 2010, 2011, 2012 Nicira Networks.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@@ -20,6 +20,7 @@
#include <stdlib.h>
#include "dynamic-string.h"
#include "hash.h"
#include "timeval.h"
#include "unixctl.h"
#include "util.h"
#include "vlog.h"
@@ -123,12 +124,20 @@ coverage_hit(uint32_t hash)
static uint32_t hit[HIT_BITS / BITS_PER_WORD];
BUILD_ASSERT_DECL(IS_POW2(HIT_BITS));
static long long int next_clear = LLONG_MIN;
unsigned int bit_index = hash & (HIT_BITS - 1);
unsigned int word_index = bit_index / BITS_PER_WORD;
unsigned int word_mask = 1u << (bit_index % BITS_PER_WORD);
/* Expire coverage hash suppression once a day. */
if (time_msec() >= next_clear) {
memset(hit, 0, sizeof hit);
next_clear = time_msec() + 60 * 60 * 24 * 1000LL;
}
if (hit[word_index] & word_mask) {
return true;
return true;
} else {
hit[word_index] |= word_mask;
return false;