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| author | Jason A. Donenfeld <Jason@zx2c4.com> | 2017-07-07 18:34:46 +0200 |
|---|---|---|
| committer | Jason A. Donenfeld <Jason@zx2c4.com> | 2017-07-20 03:37:39 +0200 |
| commit | 7615661489cb119ec25e31096874d040fd360a05 (patch) | |
| tree | 637fe8817fddbedd585dafeb26137409beede925 | |
| parent | 24f52add6f34e91eda32a6fedca139ffb9cb236e (diff) | |
selftests: ensure that there isnt CPU lag when testing rate limiter
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
| -rw-r--r-- | src/selftest/ratelimiter.h | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/src/selftest/ratelimiter.h b/src/selftest/ratelimiter.h index 5b68014..f0bed8f 100644 --- a/src/selftest/ratelimiter.h +++ b/src/selftest/ratelimiter.h @@ -2,6 +2,8 @@ #ifdef DEBUG +#include <linux/jiffies.h> + static const struct { bool result; unsigned int msec_to_sleep_before; } expected_results[] __initconst = { [0 ... PACKETS_BURSTABLE - 1] = { true, 0 }, [PACKETS_BURSTABLE] = { false, 0 }, @@ -12,6 +14,16 @@ static const struct { bool result; unsigned int msec_to_sleep_before; } expected [PACKETS_BURSTABLE + 5] = { false, 0 } }; +static unsigned int maximum_jiffies_before_index(int index) +{ + unsigned int total_msecs = 2 * MSEC_PER_SEC / PACKETS_PER_SECOND / 3; + int i; + + for (i = 0; i < index; ++i) + total_msecs += expected_results[i].msec_to_sleep_before; + return msecs_to_jiffies(total_msecs); +} + bool __init ratelimiter_selftest(void) { struct sk_buff *skb4; @@ -20,7 +32,8 @@ bool __init ratelimiter_selftest(void) struct sk_buff *skb6; struct ipv6hdr *hdr6; #endif - int i = -1, ret = false; + int i = -1, tries = 0, ret = false; + unsigned long loop_start_time; BUILD_BUG_ON(MSEC_PER_SEC % PACKETS_PER_SECOND != 0); @@ -57,7 +70,18 @@ bool __init ratelimiter_selftest(void) skb_reset_network_header(skb6); #endif +restart: + loop_start_time = jiffies; for (i = 0; i < ARRAY_SIZE(expected_results); ++i) { + if (time_is_before_jiffies(loop_start_time + maximum_jiffies_before_index(i))) { + if (++tries >= 1000) + goto err; + gc_entries(NULL); + rcu_barrier(); + msleep(300); + goto restart; + } + if (expected_results[i].msec_to_sleep_before) msleep(expected_results[i].msec_to_sleep_before); |