Resumen:
Hardware performance monitoring counters (PMCs) have proven effective in characterizing application performance. Because PMCs can be only accessed directly at the OS privilege level, kernel-level tools must be developed to enable the end user and userspace programs to access PMCs. A large body of work has demonstrated that the OS scheduler can perform effective runtime optimizations in multicore systems by leveraging per-thread performance-counter data. Notably, while existing tools greatly simplify collecting PMC application data from user space, they do not provide a simple mechanism making it possible for the thread scheduler to use performance counters for its own purpose. To address this shortcoming we present PMCTrack, a novel tool for the Linux kernel that provides a simple architecture-independent mechanism making it possible for the OS scheduler to access per-thread …
