Performance measurement using hardware facilities

Gathering performance data constitutes an additional load on the Linux instance on which the application to be analyzed runs. Hardware support for data gathering can reduce the extra load and can yield more accurate data.

For the performance measurement facilities of z/VM®, see Performance monitoring for z/VM guest virtual machines.

Other performance relevant information is provided in the context of the respective device driver or feature. For example, see Working with DASD statistics in debugfs for DASD performance and Starting and stopping collection of QETH performance statistics for qeth group devices.