7 Commits (10cca18922c9bc84009c393124413ad11f1ee15b)

Author	SHA1	Message	Date
Mike Lang	10cca18922	Fix a deadlock due to signal interactions with prometheus client ... The prometheus client uses a threading.Lock() to prevent shared access to certain metric state. This lock is taken as part of doing collection, as well as during metric.labels(). We hit a deadlock where our stack sampler signal arrived during a collection, when the lock was held. This meant that flamegraph.labels() blocked forever, and the lock was never released, hanging all metrics collection. Our solution is a hack, which is to reach into the internals of our metric object and replace its lock with a dummy one. This is reasonably safe, but only as long as the prometheus_client internal structure doesn't change signfigiantly.	6 years ago
Mike Lang	8fe2fec958	common: convert from module to package	6 years ago
Mike Lang	d90f01b8ce	common: Create general function for timing things, and use it to time get_best_segments ... The function is quite customizable and therefore quite complex, but it allows us to easily annotate a function to be timed with labels based on input and output, as well as normalize results based on amount of work done to get a better picture of the actual amount of time taken per unit of work. This will help us monitor for performance issues.	6 years ago
Mike Lang	b0ded641c3	Add a logging handler which counts logs for prometheus stats ... This isn't as good as having a full centralised logging system, but should suffice to know if anything funny is happening.	6 years ago
Mike Lang	d7641aecf5	common: Fix bugs and issues with bustime utils	6 years ago
Mike Lang	048277b003	common: Basic config and bustime code	6 years ago
Mike Lang	a361ab7a63	Add a common package for common bits in multiple components	6 years ago