247d682fe1
Processing overhead for selinux violation messages is costly. We want to deal with bursts of violations, but we have no intent of allowing that sustained burst to go unabated as there is a cost of processing and battery usage. Tunables in libaudit.h are: AUDIT_RATE_LIMIT_DEFAULT 20 /* acceptable burst rate */ AUDIT_RATE_LIMIT_BURST_DURATION 10 /* number of seconds of burst */ AUDIT_RATE_LIMIT_MAX 5 /* acceptable sustained rate */ Since we can only asymptotically handle DEFAULT rate, we set an upper threshold of half way between the MAX and DEFAULT rate. Default kernel audit subsystem message rate is set to 20 a second. If sepolicy exceeds 125 violation messages over up to ten seconds (>=~12/s), tell kernel audit subsystem to drop the rate to 5 messages a second. If rate drops below 50 messages over the past ten seconds (<5/s), tell kernel it is ok to increase the burst rate back to 20 messages a second. Test: gTest logd-unit-tests --gtest_filter=logd.sepolicy_rate_limiter_* Bug: 27878170 Change-Id: I843f8dcfbb3ecfbbe94a4865ea332c858e3be7f2 |
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| Android.mk | ||
| logd_test.cpp | ||