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This paper studies some work that has be ..." Dynamic upgrade of software Abstract—Part of any self-healing system must be a mechanism that allows the software in the system to be upgraded.
This approach allows updating applications that until now could not be updated at runtime at all or could be updated but with a possibly indefinite delay between the time an update is initiated and the time the update is effected (during this period no service is provided).To demonstrate the applicability of POLUS, we report our experience in using POLUS to dynamically update three prevalent server applications: vsftpd, sshd and apache HTTP server. Citation Context ...applied to compiled binaries and currently running software.Performance measurements show that POLUS incurs negligible runtime overhead: a less than 1% performance degradation (but 5 % for one case). Second, it is difficult to find update points for multithreaded software, and some modules in a busy system may not even have a safe point =-=[2, 4]-=-.We assume that the system has to serve the clients while the upgrade is in progress. Chen =-=-=- and the team came up with a novel idea of using virtualization and Baumann  and colleagues developed an experimental 4 The implementations were done in the Linux systems. Some of the work is based on the assumption that small amount of downtime is acceptable, while others try to get the upgrade finished with no downtime at all. Now we have two threads that must share the data structure but they both use different kinds of structure!
Unlike existing approaches, we allow arbitrary changes to functions active on the stack and without requiring the programmer to anticipate the future evolution of a program.