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Do not advance decay epoch when time goes backwards.

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Instead, move the epoch backward in time.  Additionally, add
nstime_monotonic() and use it in debug builds to assert that time only
goes backward if nstime_update() is using a non-monotonic time source.
This commit is contained in:
Jason Evans
2016-10-10 22:15:10 -07:00
parent ee0c74b77a
commit 5f11fb7d43
6 changed files with 63 additions and 6 deletions
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13
test/unit/decay.c
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@@ -2,12 +2,20 @@
const char *malloc_conf = "purge:decay,decay_time:1,lg_tcache_max:0";
static nstime_monotonic_t *nstime_monotonic_orig;
static nstime_update_t *nstime_update_orig;
static unsigned nupdates_mock;
static nstime_t time_mock;
static bool nonmonotonic_mock;
static bool
nstime_monotonic_mock(void)
{
return (false);
}
static bool
nstime_update_mock(nstime_t *time)
{
@@ -315,7 +323,9 @@ TEST_BEGIN(test_decay_nonmonotonic)
nstime_update(&time_mock);
nonmonotonic_mock = true;
nstime_monotonic_orig = nstime_monotonic;
nstime_update_orig = nstime_update;
nstime_monotonic = nstime_monotonic_mock;
nstime_update = nstime_update_mock;
for (i = 0; i < NPS; i++) {
@@ -339,8 +349,9 @@ TEST_BEGIN(test_decay_nonmonotonic)
config_stats ? 0 : ENOENT, "Unexpected mallctl result");
if (config_stats)
assert_u64_gt(npurge1, npurge0, "Expected purging to occur");
assert_u64_eq(npurge0, npurge1, "Unexpected purging occurred");
nstime_monotonic = nstime_monotonic_orig;
nstime_update = nstime_update_orig;
#undef NPS
}